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Product Number: 6DS3-SMB(=), 12DS3-SMB(=)
This publication contains instructions for installing and configuring the 6-port or 12-port copper 6DS3-SMB or 12DS3-SMB line cards in a Cisco 12000 series Gigabit Switch Router (GSR) to enable direct termination of isolated DS3 circuits on the router. The 6DS3-SMB and 12DS3-SMB line cards provide copper DS3 interfaces to the GSR that are connected to devices on the remote customer side using sub-miniature bayonet coupling (SMB) connectors.
This section contains important information about additional documentation, Cisco IOS software configuration, safety, and technical support. It also describes important operating considerations for your line card.
The Cisco Documentation CD-ROM package provides comprehensive documentation on the entire Cisco product line. The CD-ROM package contains documents in both Adobe portable document format (PDF), viewable with Adobe Acrobat Reader, and hypertext markup language (HTML) files, viewable with a Web browser.
The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly; therefore, it might be more up to date than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription.
For hardware installation and maintenance information on the Cisco 12000 series routers, refer to the installation and configuration guide that shipped with your Cisco 12000 series router.
Also refer to the field-replacable unit (FRU) publications that describe how to install, maintain, and replace router subsystems, such as cooling fans, power supplies, chassis backplanes, and so on.
The Cisco IOS software that runs on your router contains extensive features and functionality.
For Cisco IOS software configuration information and support, refer to the configuration and command reference publications in the Cisco IOS software configuration documentation set that corresponds to the Cisco IOS software release installed on your Cisco hardware. You can also refer to the Cisco IOS software release notes for the version of Cisco IOS software you are using on your router.
Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Refer to "Cisco Connection Online," at the end of this publication, for complete information on how to obtain support through CCO.
You can also contact Cisco Customer Service at 800 553-6387 or 408 526-7208 (U.S.). Customer Service hours are 5:00 a.m. to 6:00 p.m. Pacific time, Monday through Friday (excluding company holidays). You can also send e-mail to cs-rep@cisco.com.
You may also find useful information in the Cisco Information Packet that shipped with your router.
The Cisco 12000 series router must have at least one clock and scheduler card (CSC) installed that provides a one-quarter bandwidth to support the requirements of the 6DS3-SMB or 12DS3-SMB line cards. Refer to the appropriate Cisco 12000 series router Installation and Configuration Guide for more information about your router.
Before you begin the procedures in this publication, review the safety guidelines in this section to avoid injuring yourself or damaging the equipment.
For information on regulatory compliance and safety, refer to the Regulatory Compliance and Safety Information publication that shipped with your linecard. This publication contains important safety information that you must read and understand before attempting to install, remove, or modify any hardware in your Cisco 12000 series router.
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, may harm you. A warning symbol precedes each warning statement. The following paragraph is an example of a safety warning. It identifies the warning symbol and associates it with a bodily injury hazard. The remaining paragraphs in this section are translations of the initial safety warning.
 | Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Waarschuwing Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen. Voor vertalingen van de waarschuwingen die in deze publicatie verschijnen, kunt u het document Regulatory Compliance and Safety Information (Informatie over naleving van veiligheids- en andere voorschriften) raadplegen dat bij dit toestel is ingesloten.
Varoitus Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista. Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen mukana olevasta Regulatory Compliance and Safety Information -kirjasesta (määräysten noudattaminen ja tietoa turvallisuudesta).
Attention Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un équipement, soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les procédures couramment utilisées pour éviter les accidents. Pour prendre connaissance des traductions d'avertissements figurant dans cette publication, consultez le document Regulatory Compliance and Safety Information (Conformité aux règlements et consignes de sécurité) qui accompagne cet appareil.
Warnung Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unfällen bewußt. Übersetzungen der in dieser Veröffentlichung enthaltenen Warnhinweise finden Sie im Dokument Regulatory Compliance and Safety Information (Informationen zu behördlichen Vorschriften und Sicherheit), das zusammen mit diesem Gerät geliefert wurde.
Avvertenza Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nel documento Regulatory Compliance and Safety Information (Conformità alle norme e informazioni sulla sicurezza) che accompagna questo dispositivo.
Advarsel Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de faremomentene som elektriske kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker. Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i dokumentet Regulatory Compliance and Safety Information (Overholdelse av forskrifter og sikkerhetsinformasjon) som ble levert med denne enheten.
Aviso Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir possíveis acidentes. Para ver as traduções dos avisos que constam desta publicação, consulte o documento Regulatory Compliance and Safety Information (Informação de Segurança e Disposições Reguladoras) que acompanha este dispositivo.
¡Advertencia! Este símbolo de aviso significa peligro. Existe riesgo para su integridad física. Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y familiarizarse con los procedimientos estándar de prevención de accidentes. Para ver una traducción de las advertencias que aparecen en esta publicación, consultar el documento titulado Regulatory Compliance and Safety Information (Información sobre seguridad y conformidad con las disposiciones reglamentarias) que se acompaña con este dispositivo.
Varning! Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och känna till vanligt förfarande för att förebygga skador. Se förklaringar av de varningar som förkommer i denna publikation i dokumentet Regulatory Compliance and Safety Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna anordning.
Electrostatic discharge (ESD) damage, which can occur when electronic cards or components are improperly handled, results in complete or intermittent failures. The 6DS3-SMB and 12DS3-SMB line cards consist of a printed circuit card that is fixed in a metal carrier. Electromagnetic interference (EMI) shielding and connectors are integral components of the carrier. Although the metal carrier helps to protect the board from ESD, use a preventive ESD strap whenever you are handling a line card.
Following are guidelines for preventing ESD damage:
 | Caution For safety, periodically check the resistance value of the ESD strap. The measurement should be between 1 and 10 megohms. |
The Cisco 12000 series Gigabit Switch Routers provide high-speed, high-volume routing of packets and ATM cells. The Cisco 12000 series includes the following platforms, all sharing a similar architecture:
The GSR architecture offers the following features and capabilities in providing support to IP-based local-area networks (LANs) and wide-area networks (WANs):
In addition, the system allows for redundant, field-replaceable units (FRUs).
The 6DS3-SMB and 12DS3-SMB line cards consist of high-density DS3 service through six T3 or twelve T3 interfaces.
The 6-port line card is a partially depopulated version of the 12-port line card. The 6-port line card consists of a total of 12 connectors. A single port consists of one coaxial connector for receiving (Rx) and one coaxial connector for transmitting (Tx). The ports on the 6-port line card are numbered 0-5. See Figure 1.
The 12-port line card consists of a total of 24 connectors. A single port consists of one coaxial connector for receiving (Rx) and one coaxial connector for transmitting (Tx). The ports on the 12 port line card are numbered 0-11. Figure 1 shows a vertical view of the 6-port and 12-port line cards and the backplane connector.
The 6DS3-SMB and 12DS3-SMB line cards support the following features:
Each line card includes the following components:
Figure 2 shows a high-level block diagram of the 6DS3-SMB or 12DS3-SMB line cards.
Each line card port uses a DS3 line interface unit (LIU) to convert the digital signals into those suitable for coaxial cable transmission. The LIU does the opposite conversion for received data. The LIUs send and receive signals compatible with the DSX-3 interface point that is up to 450 feet (137 meters) away from the 6DS3-SMB or 12DS3-SMB line cards.
The 512 KB burst buffer prevents dropping packets when there are instantaneous increases in the number of back-to-back small packets arriving at an aggregate rate equivalent to OC-12 line rates. Burst buffers provide high throughput and smooth out the arriving packet burst for the Layer 3 switch processor.
Each line card has two silicon queuing engines: receive (Rx) and transmit (Tx). The receive engine moves packets from the burst buffer to the switch fabric, and the transmit engine moves packets from the switch fabric to the transmit interface.
When an incoming IP packet is clocked into the silicon queuing engine, the silicon queuing engine verifies the packet's integrity by checking the cyclic redundancy check (CRC) value, transfers the IP packet to buffer memory, then conveys the location of the IP packet to the Layer 3 switching accelerator. The forwarding processor then instructs the silicon queuing engine to place the IP packet on the appropriate virtual output queue.
There is one virtual output queue for each line card, plus a dedicated virtual output queue for multicast packets. This placement of the IP packets in a virtual output queue is based on the forwarding decision made by the processor. The transmit silicon queuing engine moves the packet from the switch fabric to the transmit buffer, then to the transmit interface.
The silicon queuing engine controls the placement of IP packets in buffer memory, as well as their removal from buffer memory. The default packet buffer memory is 32 MB, which includes 16 MB of receive buffers and 16 MB of transmit buffers. The buffer memory can be increased to 64 MB of receive buffers and 64 MB of transmit buffers. The buffers should support delays comparable to the longest round-trip delays measured on the Internet at DS3 line rates.
The Layer 3 switching accelerator assists the forwarding processor. It is a specially designed application-specific integrated circuit (ASIC) that optimizes access to the Layer 2 and Layer 3 information within each packet, because this access process must be performed as rapidly as possible.
A forwarding processor makes forwarding decisions based on the information in the Cisco Express Forwarding (CEF) table and the Layer 3 information in the packet. The Gigabit Route Processor (GRP) constantly updates forwarding information in the forwarding table, based on the latest information in the routing table. The forwarding processor is an R5000 RISC processor operating at 250 MHz. Once the forwarding decision has been made, the forwarding processor notifies the silicon queuing engine, which places the packet in the proper queue.
This partitioning between the Layer 3 switching accelerator and the forwarding processor blends the high throughput of hardware-accelerated forwarding with the flexibility of software-based routing.
Each link on the switch fabric interface is 1.25-Gbps that provides a full-duplex data path to the switching fabric that the GRP uses. Once a packet is in the proper queue, the switch fabric interface issues a request to the master clock scheduler on the primary clock scheduler card. The scheduler issues a grant and transfers the packet across the switching fabric.
A maintenance bus (MBus) module on the line card responds to requests from the master MBus module on the GRP. The line card MBus module can report temperature and voltage information to the master MBus module. In addition, the MBus module on the line card contains the international data electrically erasable programmable read-only memory (ID-EEPROM), which stores the serial number, hardware revision level, and other information about the card.
Each line card maintains a Cisco Express Forwarding (CEF) memory table. These tables, derived from routing tables maintained by the GRP, are used by the line card processor to make forwarding decisions. Large routing tables need more DRAM to support large CEF tables. For information on adding memory to a line card, see the Cisco 12000 Series Gigabit Switch Router Memory Replacement Instructions publication.
This section provides information to help you prepare to install and configure the 6DS3-SMB and 12DS3-SMB line cards and contains safety and ESD-prevention guidelines. The following sections describe prerequisites and preparation information:
We recommend that you do the following before beginning any of the procedures in this publication:
You need the following tools and parts to remove and replace a line card. If you need additional equipment, contact your service representative for ordering information.
The 6DS3-SMB and 12DS3-SMB line cards are compatible with any Cisco 12000 series router that runs Cisco IOS Release 12.0(5)S or a later release.
The show version, show diag, and show hardware commands display the current hardware configuration of the router, including the system software version that is currently loaded and running. For complete descriptions of show commands, see the Configuration Fundamentals Configuration Guide and Configuration Fundamentals Command Reference publications, which are available on CCO, the Documentation CD-ROM, or as printed copies.
In the following example of the show version command, the Cisco IOS software version, Release 12.0(5)S is displayed:
Router# show version Cisco Internetwork Operating System Software IOS (tm) GS Software (GSR-P-M), Version 12.05S <<<<<----see software version Copyright (c) 1986-1998 by cisco Systems, Inc. Compiled Sat 09-April-99 18:30 Image text-base: 0x600108E0, data-base: 0x605FC000 ROM: System Bootstrap, Version 12.05S.1, [tamb 176] (fc1) BOOTFLASH: GS Software (GSR-BOOT-M), Version 12.05S.1, (fc1)
(Remainder of displayed text omitted from example.)
The show diag command displays the current hardware configuration of the router, as shown in the following example:
Router# show diag 2
SLOT 2 (RP/LC 2 ):6 Port Packet over DS3
MAIN:type 47, 800-5022-01 rev 77 dev 0
HW config:0x00 SW key:00-00-00
PCA: 73-3847-02 rev 72 ver 2
HW version 1.0 S/N SAK0316005J
MBUS:MBUS Agent (1) 73-2146-07 rev B0 dev 0
HW version 1.2 S/N CAB031112A2
Test hist:0x00 RMA#:00-00-00 RMA hist:0x00
DIAG:Test count:0x00000000 Test results:0x00000000
MBUS Agent Software version 01.36 (RAM) (ROM version is 01.33)
Using CAN Bus A
ROM Monitor version 10.00
Fabric Downloader version used 13.04 (ROM version is 13.04)
Primary clock is CSC 1
Board is analyzed
Board State is Line Card Enabled (IOS RUN )
Insertion time:00:00:11 (18:34:12 ago)
DRAM size:33554432 bytes
FrFab SDRAM size:16777216 bytes
ToFab SDRAM size:16777216 bytes
Router#
(Remainder of displayed text omitted from example.)
If the screen output indicates that the system software is running a version earlier than Cisco IOS Release 12.0(5)S, check the contents of Flash memory to determine whether the required images are available on your system. The show flash command displays a list of all files stored in Flash memory. If you do not have the correct software version, contact Cisco customer service.
The line cards should have a hardware revision level of 73-3847-03 A0 or later for the 6DS3-SMB line card and 73-3848-03 A0 or later for the 12DS3-SMB line card. The hardware revision number is printed on a label affixed to the component side of the card. You can also display the hardware revision number by using the show diag and show hardware commands.
The specification for T3 transmission defines the line build-out settings of each cable length from 0 to 450 feet (137 meters) to a DSX-3 point. Use the show running-config command or the show controller serial slot/port command to see the cable length. The line build-out settings are based on standard 75-ohm coaxial cable, such as Lucent 374A.
The 6DS3-SMB and 12DS3-SMB line cards are available with the memory options described in Table 1 and Table 2. Refer to the Cisco 12000 Series Gigabit Switch Router Memory Replacement Instructions publication for installation procedures if you are upgrading or replacing line card memory.
| Product Option | Description |
|---|---|
MEM-DFT-GRP/LC-64 | 64 MB (default) |
MEM-GRP/LC-128 | 128 MB (orderable upgrade) |
MEM-GRP/LC-256 | 256 MB (orderable upgrade) |
Table 2 lists the available configurations and associated product numbers of SDRAM DIMMs for upgrading transmit and receive buffer memory on Cisco 12000 series GSR line cards.
| Packet Memory Size | DIMM Modules1 | Cisco Product Number |
64 MB | 2 32-MB DIMMs | MEM-LC-PKT-642 |
128 MB | 2 64-MB DIMMs | MEM-LC-PKT-1283 |
This section describes the line card slot locations in the following Cisco 12000 series routers:
Before installing your line card into the router, verify that a line card slot is available.
Figure 3 shows the location of the line card slots in the Cisco 12016 GSR. The Cisco 12016 GSR chassis has three integral card cages: the upper card cage, the lower card cage, and the switch fabric card cage. You can install line cards in the upper or lower card cage.
The upper card cage has eight user-configurable slots that support the following types of cards in the quantities indicated:
The lower card cage in the Cisco 12016 GSR has eight user-configurable slots, numbered 8 through 15, that support the following types of cards in the quantities indicated:
Figure 4 shows the location of the line card slots in the Cisco 12012 GSR. The Cisco 12012 GSR upper card cage contains 12 slots that accommodate the following types of cards in the quantities indicated:
Cisco 12000 series line cards---From one to eleven line cards of different types can be installed in the line card slots in the upper cage (slots 0 through 12). Although you can install a line card in slot 0, the established convention is for the primary GRP to occupy this slot. Figure 4 shows a 6DS3-SMB and 12DS3-SMB line card installed in slots 4 and 5, respectively.
Figure 5 shows the location of the line card slots in the Cisco 12008 GSR. The Cisco 12008 GSR upper card cage contains ten slots that accommodate the following types of cards in the quantities indicated:
Cisco provides twelve RG-179 T3 cables with the 6DS3-SMB line card and twenty-four RG-179 T3 cables with the 12DS3-SMB line card when you order a Cisco 12000 series Gigabit Switch Router system. However, you must select the gender of the T3 coaxial cables at the time you place the order for the Cisco 12000 series Gigabit Switch Router system. Only non-spare line cards are shipped with cables by default. See Table 3 for cable connector specifications. If you do not specify the T3 cable gender when you order the system, the T3 cables will not be included in the 6DS3-SMB or 12DS3-SMB line card packaging. If you order a 6DS3-SMB or 12DS3-SMB line card as a spare, field-replaceable unit, you must order RG-179 T3 coaxial cables at an additional cost.
The T3 cables are ten-feet long and have a female SMB connector on one end and a female or male bayonet coupling (BNC) connector on the other end. Use the female SMB cable connectors to connect the local line card Rx and Tx ports. Use the BNC cable connectors to connect the line card Rx and Tx ports to other devices. See Figure 6.
When you connect the cables to a configured port on the line card, it takes up to 20 seconds to initialize and show the green carrier detected LED.
You can build your own cables for connecting the 6DS3-SMB or 12DS3-SMB line cards by using the cables listed in Table 3. All three cables have an SMB connector at one end that connects to the 6DS3-SMB or 12DS3-SMB line cards. The two SMB-to-BNC cables in Table 3 differ only in that one terminates in a male BNC connector, while the other terminates in a female BNC connector. You can use the third cable for directly connecting two closely-spaced 6DS3-SMB or 12DS3-SMB line cards back-to-back. These cables have SMB connectors on both ends of the cable.
You can order the SMB-to-BNC cables in pairs from Cisco as 2CBLE-SMB-BNC-F for the female, or 2CBLE-SMB-BNC-M male BNC terminations, respectively. Cisco does not the sell an SMB-to-SMB cable.
SMB-to-BNC Male ITT-Cannon 051-124-9859-C9A Radial R142076000 Double-shielded SMB-to-BNC Female ITT-Cannon 051-124-9859-C9A Amp 413760-4 Double-shielded SMB-to-SMB ITT-Cannon 051-124-9859-C9A ITT-Cannon 051-124-9859-C9A Double-shielded
Table 3: Cable Connector Specifications
Cable Configuration
Line Card End
Remote End
RG-179 Cable
(or equivalent)
Amp 413589-4
(or equivalent)
Harbour Ind. H6233-1
(or equivalent)
(or equivalent)
Harbour Ind. H6233-1
(or equivalent)
Back-to-Back
Harbour Ind. H6233-1
(or equivalent)
T3 systems are designed for cable lengths of 450 feet between the transmitter and the DSX-3 demarcation point where the standard pulse mask must be met. From the DSX-3 point, another run of 450 feet is allowed to the receiver, making a total of 900 feet between transmitter and receiver. This limitation is due to signal attenuation in the cable.
Although the ANSI standard T1.404-1994 stipulates the Western Electric or equivalent 728A coaxial cable, it has been replaced by Lucent's (formerly AT&T) 374A cable. Cisco tested more than 900 feet of 374A coaxial cable from transmitter to receiver including the SMB-to-BNC adapter cables to verify high signal attenuation.
Table 4 lists some approximate attenuation values from the ANSI standard, and shows the RG-179 attenuation. As you can see, RG-179 has a much higher attenuation, so take this information into account if you plan long runs of RG-179 cable.
| Approximate Cable Attenuation, dB1 | |||||
|---|---|---|---|---|---|
| from ANSI Standard T1.404-1994 | |||||
| DSX-3 Point | Maximum transmitter-to-receiver distance | RG-179 | |||
| Frequency | 100 ft (30 meters) | 450 ft (137 meters) | 900 ft (274 meters) | 100 ft (30 meters) | |
1 MHz | 0.27 | 1.2 | 2.4 |
| 3.0 |
10 MHz | 0.80 | 3.6 | 7.2 |
| 5.3 |
50 MHz | 1.82 | 8.2 | 16.4 |
| 8.5 |
100 MHz | 2.64 | 11.9 | 23.8 |
| 10.0 |
| 1dB = decibels |
The cable-management system in the Cisco 12000 series router organizes the interface cables entering and exiting the system, keeping them out of the way and free of sharp bends. Excessive bending in an interface cable can degrade performance and possibly harm the cable.
The cable-management system for the 6DS3-SMB and 12DS3-SMB line card consists of two separate components:
Figure 9 shows a cable-management bracket for line card copper connectors mounted on a 6DS3-SMB line card. The cable-management tray on the Cisco 12008 GSR is similar in form and function to the cable-management tray on the Cisco 12012 GSR.
The cable-management system for the 12012 and 12008 routers consists of two separate components:
Figure 10 shows a generic cable-management tray and cable-management bracket mounted on a Cisco 12012 GSR.
The Cisco 12016 has a cable-management tray for the upper card cage that is positioned above the upper line card slots, and a cable-management tray for the lower card cage that is positioned below the lower line card slots. In addition, there are vertical cable troughs on either side of the card cages that keep the cables organized and secured. Figure 11 shows the location of the upper and lower cable-management trays for the Cisco 12016 router.
This section describes the procedure for installing or replacing a line card in a Cisco 12000 series router. (Read the following section, "Guidelines for Line Card Removal and Installation," before removing a line card while power to the system is on.)
You can remove and replace line cards while the system is operating; you do not need to issue software commands or reset the system power. This functionality allows you to add, remove, or replace line cards with the system online, which provides a method that is seamless to end users on the network, maintains all routing information, and ensures session preservation.
When you install a line card, the system automatically downloads the necessary software from the GRP. After that, the system brings online only those interfaces that match the current configuration and were previously configured as up. You must configure all others with the configure command. (For line card configuration information, see the section "Configuration Example,".)
| Caution The system can indicate a hardware failure if you do not follow proper procedures. To avoid erroneous failure messages, remove or insert only one line card at a time. Allow at least 15 seconds for the system to complete the preceding tasks before removing or inserting another line card. |
Each line card has two ejector levers that allow you to release the card from its backplane connector when you are removing the line card, and to firmly seat the line card in its backplane connector when you are installing the line card. The ejector levers align and seat the card connectors in the backplane. (See Figure 12.)
When you remove a line card, always use the ejector levers to ensure that the card connector pins disconnect from the backplane in the logical sequence expected by the system. Any card that is only partially connected to the backplane can halt the system.
Similarly, when you install a line card, always use the ejector levers to ensure that the card is correctly aligned with the backplane connector, the card connector pins make contact with the backplane in the correct order, and the card is fully seated in the backplane. A card that is only partially seated in the backplane will cause the system to hang and, subsequently, crash.
Line cards support online insertion and removal (OIR), which means that you can remove and replace line cards while the system remains powered up.
To remove a line card, use Figure 12 as a reference and perform the following procedure:
Step 1 Attach an antistatic wrist strap to your wrist and to the ESD connection socket on the chassis or to a bare metal surface on the chassis or frame.
Step 2 Disconnect the coaxial cable connectors from the line card ports.
Step 3 Disconnect and remove the line card coaxial cables and line card cable-management bracket.
Step 4 Use a Phillips screwdriver to loosen the captive screw at each end of the line card faceplate. (See Figure 12a.)
| Caution When you are removing a line card, always use the ejector levers to ensure that the card connector pins disconnect from the backplane in the logical sequence expected by the system. A card that is only partially connected to the backplane can halt the system. |
Step 5 Simultaneously pivot the ejector levers away from each other to release the line card from the backplane connector. (See Figure 12b.)
Step 6 Grasp the ejector levers and pull the line card halfway out of the slot.
Step 7 Grasp the line card faceplate with one hand and pull the line card straight out of the slot, keeping your other hand under the line card to guide it. (See Figure 12c.) Avoid touching the line card printed circuit board, components, or any connector pins.
Step 8 Place the removed line card on an antistatic mat or foam pad, or place it in an antistatic bag if you plan to return it to the factory.
Step 9 If the line card slot is to remain empty, install a line card blank (Cisco product number 800-03004-01) to keep dust out of the chassis and to maintain proper airflow through the line card compartment. Secure the line card blank to the chassis by tightening its captive screws.
A line card slides into any available line card slot and connects directly to the backplane.
If you install a new line card, you must first remove the line card blank from the available slot. Refer to the procedures in the previous section, "Removing a Line Card."
| Caution The system can indicate a hardware failure if you do not follow proper procedures. Remove or insert only one line card at a time. Allow at least 15 seconds for the system to complete the preceding task before removing or inserting another line card. |
Use the following procedure to install a line card:
Step 1 Ensure that a console terminal is connected to the GRP console port and that the console is turned on.
Step 2 Attach an ESD wrist strap to your wrist and to the ESD connection socket on the chassis or to a bare metal surface on the chassis or frame.
Step 3 Choose an available slot for the line card, and verify that the line card's interface cable is long enough for you to connect the line card to any external equipment. Use the female BNC cable connectors to connect the local line card Rx and Tx ports. Use the male BNC cable connectors to connect the line card Rx and Tx ports to other devices.
| Caution To prevent ESD damage, handle line cards by the card carrier edges only. |
Step 4 Grasp the faceplate of the line card with one hand and place your other hand under the card carrier to support the weight of the card; position the card for insertion into the card cage slot. Avoid touching the line card printed circuit board, components, or any connector pins.
Step 5 Carefully slide the line card into the slot until the ejector levers make contact with the edges of the card cage, then stop. Make sure the ejector lever hooks catch the lip of the card cage. (See Figure 13.)
| Caution When you are installing a line card, always use the ejector levers to ensure that the card is correctly aligned with the backplane connector, that the card connector pins make contact with the backplane in the correct order, and the card is fully seated in the backplane. A card that is only partially seated in the backplane will cause the system to hang and, subsequently, crash. |
Step 6 Simultaneously pivot both ejector levers toward each other until they are perpendicular to the line card faceplate. This action firmly seats the card in the backplane.
Step 7 Use a Phillips screwdriver to tighten the captive screw on each end of the line card faceplate to ensure proper EMI shielding and to prevent the line card from becoming partially dislodged from the backplane. (These screws must be tightened to meet EMI specifications.)
| Caution To ensure that there is adequate space for additional line cards, always tighten the captive installation screws on each newly installed line card before you insert any additional line cards. These screws also prevent accidental removal and provide proper grounding and EMI shielding for the system. |
Step 8 Reinstall the line card cable-management bracket (see Figure 12, shown previously):
(a) Unhook the line card cable-management bracket from the chassis cable-management tray or bracket.
(b) Position the line card cable-management bracket over the front of the line card faceplate.
(c) Insert and tighten the captive screw at each end of the line card cable-management bracket to secure the bracket to the line card.
Step 9 Plug the coaxial cable connectors into their original ports on the line card faceplate.
This section contains the following procedures:
In the following procedure, we assume that you have installed a new line card in the router. You must also install a line card cable-management bracket on the 6DS3-SMB or 12DS3-SMB line card. See Figure 9 for the cable-management bracket that is specific to the 6DS3-SMB or 12DS3-SMB line card.
To install a line card cable-management bracket on a line card, perform the following steps:
Step 1 Attach an ESD wrist strap to your wrist and to the ESD connection socket on the chassis or to a bare metal surface on the chassis or frame.
Step 2 Attach the line card cable-management bracket to the line card as follows:
(a) Position the line card cable-management bracket over the front of the line card faceplate.
(b) Insert and tighten the captive screw at each end of the line card cable-management bracket to secure the bracket to the line card.
Step 3 Starting with the bottom port on the line card, connect each interface cable to the intended port. (See Figure 14a.)
Step 4 Carefully press the interface cable into the cable clip on the end of the cable standoff. (See in Figure 14b.) Avoid any kinks or sharp bends in cable.
Step 5 Proceeding upward, carefully press the interface cable into the cable-routing clips along the base of the line card cable-management bracket. (See Figure 14c.)
Step 6 Repeat Step 3 through Step 5 for all of the interface cables on the line card ports.
To remove the interface cables from a line card cable-management bracket and to remove the cable-management bracket from a line card, perform the following steps:
Step 1 Attach an ESD wrist strap to your wrist and to the ESD connection socket on the chassis or to a bare metal surface on the chassis or frame.
Step 2 On a piece of paper, note the current interface cable connections to the ports on each line card.
Step 3 Starting with the interface cable for the bottom port on the line card (for cards with multiple ports), disconnect the cable from the line card port. (See Figure 15a.)
Step 4 Proceeding upward, remove the interface cable from the cable clip on the end of the cable standoff. (See Figure 15b.)
Step 5 Remove the interface cable from the cable-routing clips along the base of the line card cable-management bracket. (See Figure 15c.)
Repeat Step 3 through Step 5 for any other interface cables on the line card ports, then proceed to Step 6.
Step 6 Loosen the captive installation screw at each end of the line card cable-management bracket and remove the bracket from the line card.
After you have installed the line card and connected the T3 coaxial cables to other devices, verify that the line card is working properly by checking the LEDs on the faceplate of the line card. (See Figure 16.)
During a typical line card boot process, the following occurs:
To verify that the line card is working properly, perform the following operational checks:
A port status LED shows six distinct states for each port on the 6DS3-SMB or 12DS3-SMB line card. A single port consists of one coaxial connector for receiving (Rx) and one coaxial connector for transmitting (Tx). Table 5 explains how to interpret the six states of the port status LED.
| Status LED States | Color | Explanation |
|---|---|---|
DN (Down) | None | The port is administratively down. |
CDHNT (Carrier Detect Hunt) | Blinking green | Seeking receive framing. |
CD (Carrier Detected) | Solid green | Verifies that receive framing was found. |
RA (Remote Alarm) | Solid yellow | Remote alarm has been detected. |
LA (Local Alarm) | Blinking yellow | Signaling a local alarm. |
Loop modes | Alternating green and yellow | Port is in loopback mode. |
The status LEDs on the line card will not be a steady green until you have configured the line card interfaces. If you used the shutdown command to disable the line card interface, you must enter a no shutdown command to enable the line card interface. To verify the correct operation of each interface, complete the configuration procedures for the line card (see the section "Configuration Example,").
There are two, four-digit alphanumeric LED displays at one end of the faceplate, near the ejector lever. These LEDs display messages telling you the state of the card. In general, the LEDs do not turn on until the GRP has discovered and powered up the card. It is normal for a message displayed as part of a sequence or process to appear too briefly to be read. Table 6 and Table 7 list the alphanumeric LED messages.
As it boots, the line card displays a sequence of messages that is similar to that shown in Table 6.
| LED Display1 | Meaning | Source |
|---|---|---|
MROM | The MBus microcode begins to execute; nnnn is the microcode version number. For example, microcode version 1.33 or above would display as 01172. This display might not be visible because it occurs for only a brief time. | MBus controller |
LMEM | Low memory on the line card is being tested. | Line card ROM monitor |
LROM | Low memory test has been completed. | Line card ROM monitor |
BSS | Main memory is being initialized. | Line card ROM monitor |
RST | The contents of the reset reason register are being saved. | Line card ROM monitor |
IO | Reset I/O register is being accessed. | Line card ROM monitor |
EXPT | Interrupt handlers are being initialized. | Line card ROM monitor |
TLB | TLB is being initialized. | Line card ROM monitor |
CACH | CPU data and instruction cache is being initialized. | Line card ROM monitor |
MEM | The size of main memory on the line card is being discovered. | Line card ROM monitor |
LROM | The ROM is ready for the download attempt. | Line card ROM monitor |
ROMI | The ROM image is being loaded into line card memory. | GRP IOS software |
FABL | The line card is waiting for the loading of the fabric downloader.3 | GRP IOS software |
FABL | The fabric downloader is being loaded into line card memory. | GRP IOS software |
FABL | The fabric downloader is being launched. | GRP IOS software |
FABL | The fabric downloader has been launched and is running. | GRP IOS software |
IOS | The Cisco IOS software is being downloaded into line card memory. | GRP IOS software |
IOS | The Cisco IOS software is being launched. | GRP IOS software |
IOS | The Cisco IOS software is running. | GRP IOS software |
IOS | The line card is enabled and ready for use. | GRP IOS software |
| 1The LED sequence shown in Table 6 might occur too quickly for you to read; therefore, this sequence is provided in this tabular form as a baseline for how the line cards should function at startup. 2The version of MBus microcode running on your system might be different. 3The fabric downloader loads the Cisco IOS software image onto the line card. |
Table 7 lists other messages displayed on the line card alphanumeric LED.
| LED Display | Meaning | Source |
|---|---|---|
MRAM | The MBus microcode begins to execute; nnnn is the microcode version number. For example, microcode version 1.17 would display as 01171. This display might not be visible because it shows for only a brief time. | MBus controller |
MAL | Card malfunction. | GRP |
PWR | Card not powered. | GRP |
PWR | Card powered. | GRP |
IN | In reset. | GRP |
RSET | Reset complete. | GRP |
MBUS | MBus agent downloading. | GRP |
MBUS | MBus agent download complete. | GRP |
ROMI | Getting ROM images. | GRP |
ROMI | Acquisition of ROM image complete. | GRP |
MSTR | Waiting for mastership determination. | GRP |
CLOK | Waiting for slot clock configuration. | GRP |
CLOK | Slot clock configuration done. | GRP |
FABL | Loading fabric downloader2 complete. | GRP |
FABI | Waiting for fabric initialization to complete. | GRP |
IOS | Downloading of Cisco IOS software is complete. | GRP |
BMA | Cisco IOS software BMA error. | GRP |
FIA | Cisco IOS fabric interface ASIC configuration error. | GRP |
CARV | Buffer carving failure. | GRP |
DUMP | Line card requesting a core dump. | GRP |
DUMP | Line card dumping core. | GRP |
DUMP | Line card core dump complete. | GRP |
DIAG | Diagnostic mode. | GRP |
FDAG | Downloading field diagnostics. | GRP |
FDAG | Launching field diagnostics. | GRP |
POST | Launching power-on self-test (POST). | GRP |
UNKN | Unknown state. | GRP |
| 1The version of MBus microcode running on your system might be different. 2The fabric downloader loads the Cisco IOS software image onto the line card. |
This section assumes that you are familiar with DS3 alarms and line states. The 6DS3-SMB and 12DS3-SMB line cards do not have an LED for alarm and event detection. However, you can enter the show controllers serial slot/port EXEC command to verify whether the alarm and event detection messages are active or inactive. Most alarm and event detection messages are short-lived, because if problems occur, the line card clears the error condition, but records the event to verify line card operation status.
The output from the show controllers serial slot/port EXEC command sends messages about the following types of alarms and events:
The output also indicates whether the alarm or event originates from the local end connector or the remote end connector, as shown in the following example:
Router# show controllers serial 0/0 DS3 port 0, interface Serial0/0 hwidb = 0x6098F6A0 ssb = 0x60ADF014, ds = 0x60ADBD94 Line state is up rxLOS inactive, rxLOF inactive, rxAIS inactive <<<--slarm/event messages txAIS inactive, rxRAI inactive, txRAI inactive Router#
(Remainder of displayed text omitted from example.)
If the line card port status LED does not come on, verify that the following conditions are valid:
To verify that the line card is connected correctly, perform the following procedure:
Step 1 While the system reinitializes each interface, observe the console display messages and verify that the system discovers the 6DS3-SMB or 12DS3-SMB line card. If all of the following conditions are true, the system should recognize the interface, but leave the interface configured as down:
Step 2 When the reinitialization is complete, verify that the status LEDs on the 6DS3-SMB or 12DS3-SMB line card are on and remain on. If the LED does stay on, proceed to Step 5. If the port status LED does not stay on, proceed to the next step.
Step 3 If the port status LED fails is not steady green, determine if the line card board connector is fully seated in the backplane. Loosen the captive installation screws, and firmly pivot the ejector levers toward each other until both are perpendicular to the 6DS3-SMB line card or 12DS3-SMB line card faceplate. Tighten the captive installation screws. After the system reinitializes the interfaces, the port status LED will turn green. Go to Step 5.
If the port status LED is still yellow, try these additional steps to reinitialize a port interface:
Step 4 If the port status LED is still not steady green, remove the 6DS3-SMB or 12DS3-SMB line card and try installing it in another line card slot.
Step 5 Use the show interfaces command to verify the status of an interface. (If the interface is not configured, you must use the procedures in the section "Configuration Example").
If an error message displays on the console terminal, see the appropriate reference publication for error message definitions. If you experience other problems that you are unable to solve, contact a service representative for assistance.
For more information on troubleshooting and diagnostics, consult the installation and configuration guide that came with your Cisco 12000 series router.
You can configure the 6DS3-SMB or 12DS3-SMB line card in a GSR with another device by using a DSU that supports any of the three third-party DSU vendors: Digital-Link, Kentrox, and Larscom. If you use a DSU to make the connection between the Cisco 12000 series router and another device, you must set the DSU mode on the local DS3 port configuration to match the DSU mode on the remote DS3 port configuration. Therefore, if the remote DS3 port uses the Kentrox vendor, it sends a request to the local DS3 port to change the DSU mode to Kentrox. The left configuration example in Figure 17 shows the 6DS3-SMB or 12DS3-SMB line card in a GSR connected to a Cisco 7200 router with a high speed serial interface (HSSI) port through an external DSU.
If you make a direct connection between a GSR and another device, the local DS3 port configuration and the remote DS3 port are both set to the Cisco DSU mode, because there is no intervening third-party DSU. The configuration example on the right in Figure 17 shows the Cisco DSU mode.
The following sections provide procedures and examples that describe how to configure and verify 6DS3-SMB or 12DS3-SMB line card configuration:
This section provides basic information to configure an interface and to specify IP routing. You can also enter other configuration commands and options, depending on the requirements of your system. To configure the 6DS3-SMB and 12DS3-SMB line card interface, you must identify the router slot where the line card is installed (for example, slot 7). Use the show diag EXEC command to verify that the system recognizes the line card.
Router# show diag 2 SLOT 2 (RP/LC 2 ):6 Port Packet over DS3 Router#
(Remainder of displayed text omitted from example.)
If you know that there is more than one 6DS3-SMB and 12DS3-SMB line card installed in the router, use the show diag summary EXEC command to see the types of line cards that are installed in all of the router slots. The following output shows a 6DS3-SMB line card in slot 2 and a 12DS3-SMB line card in slot 6.
Router# show diag summ SLOT 0 (RP/LC 0 ):1 Port Packet Over SONET OC-12c/STM-4c Single Mode SLOT 1 (RP/LC 1 ):1 port SONET OC12 channelized to DS3 Single Mode SLOT 2 (RP/LC 2 ):6 Port Packet over DS3 <<<<<----see DS3 line card SLOT 4 (RP/LC 4 ):4 Port Packet Over SONET OC-3c/STM-1 Single Mode SLOT 6 (RP/LC 6 ):12 Port Packet over DS3 <<<<<----see DS3 line card Router#
If you want to address a specifc 6DS3-SMB or 12DS3-SMB line card interface, refer to interface slot 2 or interface slot 6, as shown in the previous output example.
If you want to address a specifc port on the 6DS3-SMB or 12DS3-SMB line card, refer to the router slot number and one of the serial interface port numbers.
Based on the previous output example:
To configure a 6DS3-SMB or 12DS3-SMB line card interface:
Step 1 Use the enable command to enter privileged EXEC mode. The system prompts you for a password if one is set.
Router> enablepassword Router#
Step 2 Enter configuration commands, one per line. Press Return after each configuration step unless otherwise noted.
Step 3 Exit the privileged EXEC mode at any time and return to the Cisco IOS operation mode you want by entering end or Ctrl-z at the prompt:
Router# end Router>
Table 8 shows default values for the DS3 serial interface configuration of an enabled line card. For more information, see the configuration examples in this section.
| Parameter | Configuration Command | Default Value |
|---|---|---|
BERT interval | interval {1-1440} | none |
BERT number of errors | range 1 to 255 inclusive | 1 |
BERT pattern | bert pattern {2^15 |2^20 | qrss |2^23 | 0s|1s} | [no] bert |
Clock source | clock source [internal | line] | line |
Cyclic redundancy check | crc [16 | 32] | 16 |
DSU mode | [no] dsu mode [cisco | digital-link | kentrox| larscom] | cisco |
DSU subrate bandwidth | [no] dsu bandwidth kbps | 44210 |
Encapsulation | encapsulation [hdlc | ppp| frame-relay] | hdlc |
Far-end DSU bandwidth | [no] dsu remote fullrate | subrate |
Framing mode | [no] framing [c-bit | m13] | c-bit |
Idle character mode | [no] idle-character [flags | marks] | flags |
Invert data | [no] invert data | No invert data |
Keepalive | [no] keepalive | keepalive 10 |
Loopback mode | [no] loopback [local | network line | network payload | remote] | no loopback |
Maximum transmission unit | [no] mtu bytes | 4470 bytes |
Payload scrambling | [no] scramble | no scramble |
Remote requests | [no] dsu remote accept | accept |
Transmitter delay | [no] transmitter-delay # of idle characters | 0-255 |
This section explains basic configuration information to enable each 6DS3-SMB or 12DS3-SMB line card port as an interface and to specify IP routing. You can configure the ports in any sequence. Therefore, the IP addresses assigned to each port do not have to be numbered in sequential order. You can also enter other configuration commands and options, depending on the requirements of your system.
Use the following procedures to configure the port 0 interface on the 12DS3-SMB line card in slot 6, which makes the serial interface slot/port 6/0.
Step 1 Type configure terminal to enter global configuration mode and specify that the console terminal will be the source of the configuration commands:
Router# configure terminal Router(config)#
Step 2 Select the line card interface you want to configure by entering the interface serial global configuration command and specifying the slot and port:
Router(config)# interface serial 6/0
Step 3 Assign an IP address and subnet mask to the port interface with the ip address interface configuration command:
Router(config-if)# ip address 1.1.1.11 255.0.0.0
Step 4 Specify DS3 framing by entering the framing interface configuration command:
Router(config-if)# framing c-bit
Step 5 Use the transmitter-delay interface configuration command to specify the number of transmitting delay gap characters that will be sent between packets. The following command selects 0 gap characters:
Router(config-if)# transmitter-delay 0
Step 6 Enable DS3 payload scrambling by entering the scramble interface configuration command:
Router(config-if)# scramble
Step 7 Enter the no keepalive interface configuration command to turn off keepalive messages:
Router(config-if)# no keepalive
Although some encapsulations benefit from keepalive processing (e.g., HDLC), the Cisco 12000 series routers do not require keepalive messages.
Step 8 Enter the no shutdown interface configuration command to change the shutdown state to up. The no shutdown command sends an enable command to the line card.
Router(config-if)# no shutdown
Step 9 Add any other configuration commands that may be required for your system configuration to enable routing protocols and to modify the 6DS3-SMB or 12DS3-SMB line card interface characteristics.
Step 10 When you have entered all of the configuration commands that complete the configuration, type end until you return to privileged EXEC mode.
Step 11 Write the new configuration to memory in privileged EXEC mode:
Router# copy running-config startup-config
The system displays an OK message when the configuration has been stored.
After you have completed the configuration, you can check it using show commands. Use the show controller EXEC command for each interface to verify the port interface status. See the following section, "Using Show Commands to Check System Status,".
Each line card in a Cisco 12000 series router maintains information about its configuration, traffic, errors, and so on. You can access this information by using the show commands. Following are descriptions and examples of the show commands.
Router# show controller serial 6/0 Interface Serial6/0 (DS3 port 0) hwidb = 0x611BF9A0 ssb = 0x61642218, ds = 0x61642120 Line state is administratively down rxLOS inactive, rxLOF inactive, rxAIS inactive <<<<<----see Alarm status txAIS inactive, rxRAI inactive, txRAI inactive <<<<<----see Alarm status Current configurable parameter settings: Loopback is none, Framing is c-bit <<<<<----see loopback and framing settings Clock source is line, Cable length is 50 <<<<<-see clock source and cable length DSU mode is cisco, DSU bandwidth limit is 44210 <<<<<--see DSU mode and bandwidth Payload scrambling is disabled, CRC is 16 <<<<<----see scrambling Bert pattern is disabled, Bert interval is 0 <<<<<----see BERT pattern status Transmitter delay is 0, Encapsulation is HDLC <<<<<----see Transmitter delay Idle character is flags, Invert data is disabled Remote fullrate has no request outstanding <<<--see far-end DSU bandwidth Remote accept is enabled, MTU is 4470 <<<<<----see Remote accept Router#
Router# show version Cisco Internetwork Operating System Software IOS (tm) GS Software (GSR-P-M), Version 12.0(5)S Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Fri 16-April-99 09:21 Image text-base: 0x60010900, data-base: 0x6061E000 Router#
Router#show interfaces serial 6/0 Serial6/0 is up, line protocol is up Hardware is DS3 line card Internet address is 1.1.1.11/24 MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, rely 255/255, load 1/255Router#
Router# show protocols Global values: Internet Protocol routing is enabled Internet address is 1.1.11.1/16 Serial6/0 is up, line protocol is up Serial6/1 is up, line protocol is up Serial6/2 is up, line protocol is up Serial6/3 is up, line protocol is up Serial6/11 is up, line protocol is up Internet address is 1.1.11.1/16 Router#
The following section, "Customizing the 6DS3-SMB and 12DS3-SMB Line Card Configuration" explains how to configure each port on the line card.
There are two sides to the network, a local network side and a remote customer side, or near and far ends. The 6DS3-SMB and 12DS3-SMB line cards support third-party data service units (DSUs), Internet Service Provider (ISP)-provided DS3 lines, and so on. You can change the configuration parameter default values in the 6DS3-SMB or 12DS3-SMB line card port interfaces to match the remote DSUs on your network. Table 9 shows the configuration parameters.
| Parameter | Configuration Command | Default Value | Command |
|---|---|---|---|
DSU mode | [no] dsu mode [cisco | digital-link | kentrox| larscom] | cisco | Router(config-if)# dsu mode cisco |
DSU subrate bandwidth | [no] dsu bandwidth kbps | 44210 | Router(config-if)# dsu bandwidth 44210 |
Far-end DSU bandwidth | [no] dsu remote fullrate | subrate | Router(config-if)# dsu remote fullrate |
Payload scrambling | [no] scramble | no scramble | Router(config-if)# scramble |
Remote requests | [no] dsu remote accept | accept | Router(config-if)# dsu remote accept |
Cyclic redundancy check | crc [16 | 32] | 16 | Router(config-if)# crc 16 |
You can use telnet to determine the DSU mode settings on the remote DS3 port. Once you verify the remote DS3 port settings, you can negotiate changing configuration parameters so that DSU mode settings are the same on both the local and remote DS3 ports. You can set the DSU bandwidth to accept or reject the incoming remote requests from the local DS3 port by entering the dsu remote accept interface configuration command.
The DSU mode supports three third-party DSU vendors---Digital-Link, Kentrox, and Larscom---and the default DSU mode, Cisco. If you use a DSU to make the connection between the Cisco 12000 series router and another device, the local DS3 port configuration must match the remote DS3 port configuration. Therefore, if the remote DS3 port uses the Kentrox vendor, a request is sent to the local DS3 port to change the DSU mode to Kentrox, by manually entering the dsu mode configuration command and specifying the Kentrox DSU, or by using the Cisco Remote Connection Management (CRCM) feature to remotely configure the remote DS3 port. If you make a direct connection between a Cisco 12000 series router and another device, you can use the Cisco DSU mode. See Figure 17 for configuration examples.
The local and remote DS3 ports must also agree on whether to use a subrate or fullrate sending and receiving rate, because the speed of the sending and receiving rate is regulated by the DSU mode. If the sending and receiving rates do not match, they will not work. Subrates are specific to DSU modes and must be configured appropriately. The subrate sending and receiving rate is slower and less expensive than the faster, more expensive, fullrate. You can synchronize the local and remote DS3 ports sending and receiving rates by entering the dsu remote interface configuration command.
The DSU bandwidth range is from 0 to 44210 kbps. The local port and the remote port must have matching configuration. Therefore, if you reduce the effective bandwidth to 3000 on the local port, you must do the same on the remote port by entering the dsu bandwidth interface configuration command.
Payload (data) scrambling converts the data received by the local or remote DS3 ports from any of the three supported third-party DSU vendor modes (Digital-Link, Kentrox, and Larscom) as well as the default, Cisco mode. To enable payload scrambling on the local and remote DS3 ports, you must enter the scramble interface configuration command. If you do not enter the scramble command, payload scrambling remains disabled by default on the local and remote DS3 ports.
The 6DS3-SMB and 12DS3-SMB line cards use a 16-bit Cyclic Redundancy Check by default, but also supports a 32-bit CRC to detect errors in transmitted data. You can set the CRC by entering the crc command. The router that sends the data divides the bits in the frame message by a predetermined number to calculate a frame check sequence (FCS). Before sending the data, the router appends the FCS value to ensure that the frame message contents are exactly divisible by a predetermined number. The router that receives the data divides the frame message by the same predetermined number and calculates the FCS. If the result is not 0, the router that receives the data assumes that a transmission error occurred and sends a request to the router to resend the data.
The only exception for matching local and remote DS3 port configurations is that the clock sources must be set opposite each other. Therefore, if you enter the clock source internal command for the local DS3 port, you must enter clock source line for the remote DS3 port.
To display controller information about local and remote DS3 ports and the requests sent between them, use the show controllers serial slot/port details command or the show controllers serial slot/port all command. The following shows output from the show controllers DS3 details command:
Router# show controllers serial 2/0 details Interface Serial2/0 (DS3 port 0) hwidb = 0x61179020 ssb = 0x615E8D54, ds = 0x615E5430 Line state is up rxLOS inactive, rxLOF inactive, rxAIS inactive txAIS inactive, rxRAI inactive, txRAI inactive Current configurable parameter settings: Loopback is none, Framing is c-bit DSU mode is cisco, DSU bandwidth limit is 44210 Payload scrambling is disabled, CRC is 16 Bert pattern is disabled, Bert interval is 0 Transmitter delay is 0, Encapsulation is PPP Idle character is flags, Invert data is disabled Remote fullrate has no request outstanding Remote accept is enabled, MTU is 4470 Incoming far end requests: 0 Total requests 0 Loopback requests, 0 No loopback requests 0 Full rate requests, 0 No full rate requests 0 Rejected requests, 0 Unknown requests Router# (Remainder of displayed text omitted from example.)
You can test the flow of data traffic by entering one of the three loopback paths that the DS3 controller supports. Specify the loopback mode by entering one of the loopback interface configuration commands shown in Table 10. Use the no form of this command to restore the default value, no loopback, which represents the normal operation between the local end (Tx) and the remote end (Rx).
| Loopback modes | Configuration Mode | Command |
|---|---|---|
Remote loopback | loopback remote | Router(config-if)# loopback remote |
Diagnostic or local loopback | loopback local | Router(config-if)# Router(config-if)# loopback local |
Network loopback modes |
|
|
Line Loopback | loopback network line | Router(config-if)# loopback network line |
Payload loopback | loopback network payload | Router(config-if)# loopback network payload |
Default value | default value | Router(config-if)# no loopback |
Each loopback path exists for each of the 6DS3-SMB or 12DS3-SMB line card ports. All loopback configuration is done in the QJET, a quad DS3 framer that provides DS3 payload and limited bit error rate test (BERT) functionality. Figure 18 shows the data flow for three loopback configuration paths, including no loopback.
This section explains how to use loopback commands to test data traffic:
Router# configure terminal Router(config)# interface serial 6/0 Router(config-if)#
Router(config-if)# loopback local Router(config-if)#
Router# configure terminal Router(config-if)# clock source internal Router(config-if)#
Router# configure terminal Router(config)# interface serial 6/0 Router(config-if)#
Router(config-if)# loopback network payload Router(config-if)#
Router(config-if)# loopback network line Router(config-if)#
Router# configure terminal Router(config-if)# clock source line Router(config-if)#
Router# configure terminal Router(config)# interface serial 6/0 Router(config-if)#
Router(config-if)# loopback remote Router(config-if)#
You can set one local DS3 serial port to BERT mode while the remaining local serial ports continue to transmit and receive normal traffic. A Bit Error Rate Test (BERT) checks communication between the local and the remote DS3 ports. If traffic is not being transmitted or received, create a back-to-back loopback BERT test and send out a predictable stream to ensure that you receive the same data that was transmitted. To determine if the remote DS3 serial port returns the bert pattern unchanged, the system administrator for the remote router must manually set the remote DS3 serial port to loopback network line, while you enter a bert pattern interface configuration command at specified time intervals on the local DS3 serial port. The following example shows how to configure the local and remote DS3 ports for a back-to-back loopback BERT test. The BERT test on serial interface 6/0 is sending a pseudo-random repeating pattern for ten minutes:
clock source internal clock source line no keepalive loopback network line no keep [gsr-1---] [--mfr-1--] [BERT Pattern] [ ] [31.1.1.2] [ 31.1.1.1] Router(config)# interface serial 6/0 Router(config-if)# bert pattern 2^23 interval 10 Router(config-if)#
Table 11 lists the BERT patterns, explains how to invoke them, and specifies test intervals between 1 to 1140 minutes long. The no bert pattern interface configuration command terminates an ongoing BERT test and returns the local and remote DS3 serial ports to the default value.
| BERT Pattern | To Invoke | Command |
|---|---|---|
2^15 | A pseudo-random repeating pattern that is 32767 bits long | Router (config-if)# bert pattern 2^15 interval 10 |
2^20 | A pseudo-random repeating pattern that is 1048575 bits long | Router (config-if)# bert pattern 2^20 interval 10 |
qrss 2^20 | A quasi-random signal source | Router (config-if)# bert pattern qrss ^ |
2^23 | A pseudo-random repeating pattern that is 8388607 bits long | Router (config-if)# bert pattern 2^23 interval 10 |
Following is an example of the bert pattern command and specified time intervals that will cause the BERT to send the pseudo-random pattern 2^23 and repeat on the first DS3 channel for 10 minutes:
Router# configure terminal Router(config)# interface serial 6/0 Router(config-if)# bert pattern 2^23 interval 10 Router(config-if)# end Router(config)# end Router#
To insert intentional errors into the BERT test stream, use the following command syntax: bert errors [no-of-errors], where the no-of-errors default is 1 and the range is 1 to 255, inclusive. The following example shows the command used to insert 5 errors into the current BERT test stream that is running the pseudo-random pattern 2^23 that repeats on the first DS3 channel for 10 minutes:
Router# configure terminal Router(config)# interface serial 6/0 Router(config-if)# bert pattern 2^23 interval 10 Router(config-if)# bert errors 5 Router(config-if)# end Router(config)# end Router#
When the DS3 serial port is running a BERT, the serial port state is down, and only BERT data is passed. However, when using show commands, the line card state may be displayed as up or down.
| Show Commands | Explanation |
|---|---|
show controller serial n/port | Shows the current controller status, where n is the slot number. |
show controller serial 6/0 bert | Shows the fields of a BERT test that is still in progress. |
The following output indicates that BERT is enabled with a pattern of 2^23 and an interval of 10 minutes:
Router# show controller serial 6/0 bert Interface Serial6/0 (DS3 port 1) BERT information: State :enabled (sync'd) Pattern :2^23 Interval :10 minutes Time remaining :00:09:44 Total errors :0 Time this sync :00:00:10 Errors this sync :0 Sync count :1 Router#
The following example shows the information of a BERT test that is still in progress:
Router# show controller serial 6/0 bert Interface Serial6/0 (DS3 port 1) BERT information: State :enabled (sync'd) Pattern :2^23 Interval :10 minutes Time remaining :00:01:44 Total errors :0 Time this sync :00:08:10 Errors this sync :0 Sync count :1 Router#
The following is an example of a screen display from a completed BERT test:
Router# show controller serial 6/0 bert Interface Serial6/0 (DS3 port 1) BERT information: State :disabled (sync'd, completed) Pattern :2^23 Interval :10 minutes Time remaining :00:00:00 Total errors :0 Time this sync :00:09:54 Errors this sync :0 Sync count :1 Router#
Table 13 provides explanations of the BERT display fields in the previous examples:
| Bert Information | Explanation |
|---|---|
State: enabled (not synchronized | BERT is active, but the hardware has not currently synchronized. Errors are counted only when the hardware has synchronized. |
State: enabled (synchronized) | BERT is active, and the hardware has synchronized. Any errors encountered are counted. |
State: disabled (not synchronized, failed) | BERT test is finished and the test resulted in failure, either because the hardware never synchronized or the PLIM (physical layer interface module) declared the test a failure. |
State: disabled (synchronized, completed) | BERT test is finished because the interval expired. |
State: disabled (synchronized, aborted) | BERT test is finished as a result of a user request (for example, no bert) |
Pattern | Can be any one of the supported BERT patterns. |
Interval | Can be any value from 1 to 1440 (units are in minutes). |
Time remaining | Can be any value from 1 second to the interval provided, formatted as hh:mm:ss. |
Total errors | The total number of errors encountered while the hardware is synchronized. |
Time this synchronization | If the hardware is currently synchronized, the amount of time since synchronization began, formatted as hh:mm:ss. If it is not currently synchronized but was synchronized earlier, indicates the amount of time that the last or most recent synchronization period lasted; formatted as hh:mm:ss. |
Errors this synchronization | If the hardware is currently synchronized, the number of errors encountered during the current sync period. If it is not currently synchronized but was synchronized earlier, the number of errors encountered during the last or most recent synchronization period. |
Synchronization count | The number of times synchronization was achieved. |
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case users will be required to correct the interference at their own expense.
You can determine whether your equipment is causing interference by turning it off. If the interference stops, it was probably caused by the Cisco equipment or one of its peripheral devices. If the equipment causes interference to radio or television reception, try to correct the interference by using one or more of the following measures:
Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and negate your authority to operate the product.
This class A digital apparatus complies with Canadian ICES-003.
Cet appareil numerique de la classe A est conforme a la norme NMB-003 du Canada.
This is a class B product based on the standard of the Voluntary Control Council for Interference from Information Technology Equipment (VCCI). If this is used near a radio or television receiver in a domestic environment, it may cause radio interference. Install and use the equipment according to the instruction manual.
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Posted: Tue Dec 7 09:35:07 PST 1999
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