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The chapter introduces and describes the MGX 8230.
This chapter includes the following sections:
The MGX 8230 is a 12-slot chassis with horizontally mounted processor modules, service modules, SRM modules, and back cards. Built with the MGX 8850/8250 architecture, the MGX 8230 accepts the same double-height and single-height service modules as the MGX 8250, with a few exceptions. The MGX 8230 does not support the route processor module (RPM), or the Voice Interface Service Module (VISM) of the MGX 8250.
Figure 1-1 shows the MGX 8230 with its door attached. Note that there are light pipes in the door that display the status of the processor models (PXMs). Figure 1-2 is a conceptual drawing of an MGX 8230 showing the dimensions and the slot numbering. The slot numbering is as it appears from the front of the MGX 8230; slots 8 and 9 refer to back card slots only.
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Note Even though the card slots in an MGX 8230 are horizontal and would more appropriately be called single-width and double-width, this manual still refers to the card slots, and the processor and service modules, as single-height and double-height. This is for consistency because the PXM and service module cards are a subset of the MGX 8850 cards that are installed vertically in an MGX 8850 chassis. |
Release 1.0 of MGX 8230 feeder includes:
The Service Resource Module-3T3 (MGX-SRM-3T3/B) can support up to 80 T1 interfaces over its three T3 lines and provide 1:N redundancy for the T1 and E1 cards.
The MGX 8230 can also support a wide range of services over narrowband and mid-band user interfaces. It maps all the service traffic to and from ATM circuits based on standardized interworking methods.
The MGX 8230 supports up to 80 channelized or non-channelized T1 and E1 interfaces on a single IP + TM multiservice gateway. These interfaces support:
Frame-based services on T3 and E3 high-speed lines are also supported.
The MGX 8230 also supports Inverse Multiplexing for ATM (IMA) to provide ATM connectivity below T3 or E3 rates via the AUSM-8T1/E1.
The modular, software-based system architecture enables it to support new features through downloadable software upgrades or new hardware modules.
The MGX 8230 converts all user-information into 53-byte ATM cells by using the appropriate ATM Adaptation Layer (AAL) for transport over the ATM backbone network. The individual service modules segment and reassemble (SAR) cells to eliminate system bottlenecks. The following list shows the applicable AAL for each service:
Appendix A, "Technical Specifications" lists all the relevant specifications and conformance information for the MGX 8230.
This section includes:
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The MGX 8230 chassis has two dedicated slots for the PXM1 (slots 1 and 2), two dedicated slots for SRM modules only (slots 7 and 14—no other Service Modules can be used in these two slots), and eight single-height slots (four double-height slots) for service modules, as shown in Figure 1-2. One additional feature available only on the MGX 8230 chassis is the ability to convert individual single height slots into double height slots.
The slots are numbered 1 to 7 on the left half of the chassis. The slots on the right side of the chassis are numbered 8 to 14. Since front slots 1 and 2 are always double-height for PXM1 processor modules, slots 8 and 9 only refer to the back card slots that correspond to the two lower single-height slots on the left side of the chassis as seen from the rear. When a double-height front card is plugged in, the left slot number is used. The back cards are numbered according to the front card numbering scheme, with the exception of slots 8 and 9 as noted above.
When converting single height slots into double height slots the conversion must start from the bottom and be contiguous. For example, before you can convert slot 4 into double height, slot 3 must be converted first as shown in Figure 1-2.
Figure 1-3 is a front view of an empty MGX 8230 chassis and Figure 1-4 is a rear view.
The MGX 8230 power system is designed with distributed power architecture centered around a -48 VDC bus on the system backplane. The -48 VDC bus accepts redundant DC power from either a -42 to -56 VDC source via optional DC power entry modules (PEMs) or from a 100 to 120 or a 200 to 240 VAC source via the optional AC Power Supply Tray. The MGX 8230 backplane distributes power via connectors on the - 48 VDC bus to each hot-pluggable processor or service module. Each card incorporates on-board DC-DC converters to convert the -48 VDC from the distribution bus voltage to the voltages required on the card.
For an AC-powered MGX 8230, an optional AC power supply tray is attached to the bottom of the MGX 8230 card cage at the factory. The AC power supply tray is one rack-unit high, and can hold up to two AC Power Supply modules. Each AC Power Supply module can provide up to 1,200W at -48VDC and has its own AC power cord and power switch. Figure 1-5 shows the rear view of an optional AC Power Supply module. The power supplies can be configured as 1+1 redundant. If no redundancy is desired, an AC tray with one AC power supply and one AC power cord can also be ordered.
Each AC Power Supply Module incorporates the following features:
For DC systems, a DC Power Entry module (PEM) is required for each DC source of central office power -42 to -56VDC. The MGX 8230 can support two DC power sources and has rear panel slots for two DC PEMS. Figure 1-6 illustrates a DC PEM.
The DC PEMs incorporate the following features:
The MGX 8230 incorporates a fan tray assembly (with eight fans) located on the left side of the card cage to pull ambient cooling air into the system through openings between front card faceplates, over the boards in the card cage, and out through air exhaust openings on the left side of unit. Figure 1-7 is an illustration of the MGX 8230 fan tray assembly.
The cooling system incorporates the following design features:
The MGX 8230 architecture is built around the switching fabric on the processor switching module (PXM1), the backplane, and the service modules. Figure 1-8 is a very simple block diagram of the MGX 8230 architecture.
The main functions of the MGX 8230 backplane are to connect cards together, terminate critical signals properly, provide -48 VDC power to all cards, and set ID numbers for each slot. In addition, the MGX 8230 backplane interconnects both front cards and back cards together via pass-through connectors. A software readable ID on the backplane is available for software to identify that the chassis is an MGX 8230.
The MGX 8230 cell bus (CB) provides high-speed interface between the switch fabric and the service modules.
Figure 1-9 shows the overall cell bus distribution of MGX 8230 backplane and Table 1-1 lists the specific cell bus allocation to each slot with respect to master and slave cell bus ports.
There is a connection on cell bus 7 to the alternate PXM1. A PXM1 is able to communicate with the other PXM1 using the slave cell bus port on that card. Slots 8 and 9 only refer to back card slots.
| Left Side Chassis | Right Side Chassis | |||||||||||
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| Physical Slot # | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 10 | 11 | 12 | 13 | 14 |
| Slot ID Address | 1s | 2s | 9 | A | B | C | D | 9 | A | B | C | D |
CB0_A/B |
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CB1_A/B |
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CB2_A/B |
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CB3_A/B |
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CB4_A/B |
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CB5_A/B |
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CB6_A/B |
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CB7_A |
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CB7_B | x |
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The MGX 8230 supports the following processor and service modules:
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Note The MGX 8230 does not support the Route Processor Module (RPM) or the Voice Interface Service Module (VISM) of the MGX 8850/8250. |
The MGX 8230 Processor Switch Module (PXM1) performs shelf control and shared-memory switching functions. It also serves as a data processing and ATM interface card. The PXM1 processor module for the MGX 8230 is identical to the PXM1 for the MGX 8250.
Primarily, the MGX 8230 PXM1 controls the switch and provides 1.2 Gbps of non-blocking, shared memory ATM switching and ATM trunking up to OC-12 speed. In addition, the PXM features:
Figure 1-10 is an illustration of a PXM1, in vertical orientation although the card is mounted horizontally in an MGX 8230 chassis. The specifications for the PXM1 are listed in Appendix A, Technical Specifications.
The PXM1 and its two types of back cards make up the required control card set. The following are model numbers of cards supported by the MGX 8230 for this release:
The M1 switch has 1.2 Gbps non-blocking, shared-memory ATM switching and ATM trunking up to OC-12 speed.
The MGX 8230 supports hot insertion and removal of the PXM1 module, as well as 1:1 hot standby redundancy for high availability. The active and redundant PXM1 modules reside in slots 1 and 2.
The PXM1 (see MGX 8230 Architecture Simple Block Diagram) also provides the following interfaces and indicators:
The PXM1 supports primary and secondary network synchronization and switchover. Synchronization source can be derived from:
It is anticipated that an optional Stratum 3 clock module will be available in a future release. This module will reside on the same slot as the PXM-UI back card.
The following functions are supported by the UI card:
The following environmental parameters are monitored by the PXM1:
Minor and major alarms will be generated when one or more environmental parameters are out of range.
PXM1 provides connectors for external audio and visual alarms. The interface can either be always open or always closed. Major and minor alarms are controlled separately. An alarm cutoff button is accessible from the front. A history LED is set when the alarm cutoff button is pressed. The history LED can be cleared by pressing the history clear button on the faceplate.
The PXM1 provides the following indicators:
PXM1 provides three types of non-volatile storage:
The BRAM also acts as a temporary cache. If for any reason the hard drive fails, information logged immediately before the failure can be stored in the BRAM for further analysis.
The OC-3c/STM-1 interface provides the feeder trunk uplink with:
The ATM layer is configurable for trunk and public or private UNI applications. It is conformant to ATM Forum UNI Specification V3.0, 3.1, ITU-T I.361 and I.432 specifications, and it supports virtual circuit connections (VCCs) and virtual path connections (VPCs) per ATM Forum UNI Specification V3.1 and ITU-T I.371.
The ATM layer supports the following maximum connections:
The virtual path identifier (VPI)/virtual channel identifier (VCI) range for VCCs and VPCs is per UNI Specification 3.1.
The PXM1 User Interface card (PXM-UI) provides the MGX 8230 with the several user- interface ports. It mates with an PXM1 through the backplane and is installed in a back card slot (slot 8 or 9). As seen from the back of the MGX 8230, the PXM-UI will plug into the slot that is on the right side of its corresponding PXM1. The user-interface ports provide the following functions:
Figure 1-11 illustrates an PXM-UI as it would be oriented for plugging into MGX 8230 back card slot 8 or 9. From right to left, the PXM UI has the following physical connectors and interfaces:
The specifications for the UI interface card are listed in Appendix A, Technical Specifications.
The MGX 8230 Uplink back card, which mates with a corresponding PXM1 through the backplane, provides the feeder trunk to the MGX switch. This uplink back card can provide either a multi-mode or single-mode fiber OC-3 interface:
Figure 1-12 shows an a 4-port MMF back card (MMF-4-155) in the orientation that the card will be inserted into an MGX 8230 backslot. MGX 8230 applications will also use an SMFIR-4-155 and an SMFLR-4-155 back card. From the back of the MGX 8230, the uplink back card is on the left side of the corresponding PXM1. The ports are numbered from right to left from 1 to 4 as shown and has SC connectors. The specifications for these cards are listed in Appendix A, Technical Specifications.
An illustration of the long-reach OC-12 card appears in Figure 1-13. For specifications on this card, refer to "Technical Specifications" Note that Automatic Protection Switching (APS) requires the "B" model—an SMFLR-1-622/B.
The intermediate reach OC-12 back card appears in Figure 1-14. For specifications on this card, refer to "Technical Specifications" Note that Automatic Protection Switching (APS) requires the "B" model—an SMFIR-1-622/B.
Figure 1-15 shows the MGX-FRSM-2T3E3 front card. Refer to "Technical Specifications." for detailed information on this card.
An illustration of the two-port T3 back card appears in Figure 1-16. For card specifications, refer to "Technical Specifications."
Two versions of the BNC-2E3 card are available. The BNC-2E3A applies to Australia only, and the BNC-2E3 applies to all other sites that require E3 lines on the PXM uplink card. An illustration of the two-port E3 back card appears in Figure 1-17. For specifications on this card, refer to "Technical Specifications."
The 8-port ATM Universal Service Module (AUSM/B-8T1E1) is a multi-purpose card set with eight T1 or E1 lines that can be used in either an MGX 8230 IP + ATM multiservice gateway or an MGX 8250 switch.
ATM Inverse Multiplexing (IMA) N x T1 and N x E1 trunking that complies with ATM Forum v3.0, v3.1: IMA supports inverse multiplexed trunks at maximum rates of 12 Mbps for T1 or 16 Mbps for E1 between the MGX 8230 and other equipment. Consequently, AUSM IMA supports inverse multiplexed trunks between BPX 8620/IGX 8400 series network nodes through local or remote MGX 8230 shelves.
The AUSM/B front card oversees all major functions of the ATM interface. It contains firmware for both the T1 and the E1 line interfaces and downloads from the PXM1 the appropriate code when it recognizes the back card type. For specifications of the AUSM/B, refer to Appendix A, Technical Specifications.
Figure 1-18 illustrates the front panel of an AUSM/B front card. This faceplate will be rotated 90 degrees to the left when it is installed in a front card slot of an MGX 8230.
Table 1-2 describes what the AUSM/B LEDs indicate.
| Type of LED | Color | Description |
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PORT LED | Green | Green indicates the port is active. |
| Red | Red indicates a local alarm on the port. |
| Yellow | Yellow indicates a remote alarm on the port. |
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| Off indicates the port has not been activated (upped). |
ACTIVE LED | Green | On indicates the card set is in active mode. |
STANDBY LED | Yellow | Slow blink with Active LED off means the card is in the boot state. |
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| Fast blink with Standby LED on means card is receiving firmware. |
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| Fast blink indicates the service module is passing BRAM channel information to the PXM. |
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| Steady yellow indicates the card is in Standby mode and the firmware is executing ADMIN code. |
FAIL LED | Red | Steady Red with Active and Standby LEDs off indicates either the card is in the Reset condition, the card has failed, or the card set is not complete (no line module). |
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| Steady Red with Active LED on indicates the card was active prior to failing. |
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| Steady Red with Standby LED on indicates the card was standby prior to failing. |
The MGX-AUSM/B-8T1 and MGX-AUSM/B-8E1 use the generic 8-port T1 or E1 line modules that operate with the 8-port service modules. The standard T1 version of the back card has eight RJ-48 connectors. The standard versions of the E1 back card have either eight RJ-48 connectors or eight pairs of SMB connectors. The following back cards are compatible with the AUSM/B:
Figure 1-19 illustrates a T1 back card for an AUSM/B. Figure 1-20 illustrates the E1 back cards for the AUSM/B with either RJ-48 or SMB connectors. All these cards will be rotated 90 degrees to the right when they are installed in an MGX 8230 back card slot that corresponds to their mating AUSM/B.
The Frame Relay Service Modules (FRSMs) can be used in either an MGX 8230 or an MGX 8850. The primary function of the FRSM is to convert between the Frame Relay-formatted data and ATM/AAL5 cell-formatted data. It converts the header format and translates the address for Frame Relay port/DLCIs, ATM-Frame UNI (FUNI) port/frame address, or frame forwarding port, and the ATM virtual connection identifiers (VPI/VCIs).
For individual connections, you can configure the FRSM to perform network interworking (NIW) or service interworking (SIW). The FRSM allows both NIW and SIW connections on the same port. You specify NIW, SIW, FUNI, or frame forwarding when adding the connection.
All FRSMs support the following features:
The MGX 8230 supports the following FRSM models:
Figure 1-21 illustrates the FRSM front cards as they would be oriented in a front card slot of an MGX 8230 chassis.
The Frame Service Module (FRSM) consists of an FRSM front card and an appropriate back card.
The following are the Frame Service Modules (FRSMs) and related back cards supported by the MGX 8230:
The T1 or E1 back cards look identical to the AUSM/B back cards shown in Figure 1-19 and Figure 1-20.
In the MGX 8230, FRSMs can have 1:1 redundancy using a Y-cable. The very high speed MGX-FRSM-2CT3, MGX-FRSM-2T3E3, and MGX-FRSM-HS2/B can use Y-cable redundancy.
For 1:1 redundancy, place the card sets in adjacent slots and connect a Y-cable for each pair of active and standby ports. On the CLI, configure the card for redundancy by executing the addred command.
Refer to the "Service Resource Module" section in this chapter for information on 1:N redundancy using the MGX 8230 SRM capability.
The main function of the Circuit Emulation Service Module (CESM), which can be used in either an MGX 8230 IP + ATM multiservice gateway or an MGX 8250/8850 switch, is to provide a constant bit rate (CBR) circuit emulation service by converting data streams into CBR AAL1 cells for transport across an ATM network. The CESM supports the CES-IS specifications of the ATM Forum.
The 8-port Circuit Emulation Service Module (CESM-8T1E1) lets you configure individual physical ports for structured or unstructured data transfer.
If you configure an individual port for structured data transfer, the CESM-8T1E1 supports:
If you configure an individual port for unstructured data transfer, the CESM-8T1E1 supports:
The MGX 8230 supports two CESM models:
Figure 1-22 illustrates the two CESM front cards. In an MGX 8230 chassis, these cards would be rotated 90 degrees to the left.
The CESM-8T1E1 card set consists of the CESM-8T1E1 front card and one of the following back cards:
The CESM E1 or T1 back cards appear the same as the AUSM/B back cards shown in Figure 1-19 and Figure 1-20.
Table 1-3 describes what the CESM LEDs mean.
| Type of LED | Color | Meaning |
|---|---|---|
PORT LED | Green | Green indicates the port is active. |
| Red | Red indicates there is local alarm on the port. |
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| Off indicates the port has not been activated (upped). |
ACTIVE LED | Green | On indicates the card set is in active mode. |
STANDBY LED | Yellow | Slow blink without the Active LED indicates the card is in the boot state. |
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| Fast blink with the Standby LED indicates the card is being downloaded. |
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| Fast blink indicates the service module is passing BRAM channel information to the PXM |
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| Steady yellow indicates the card is in Standby mode and the firmware is executing ADMIN code. |
FAIL LED | Red | Steady Red with Active and Standby LEDs off indicates either the card is in the Reset condition, the card has failed, or the card set is not complete (no line module). |
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| Steady Red with Active LED on indicates the card was active prior to failing. |
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| Steady Red with Standby LED on indicates the card was standby prior to failing. |
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| Both standby and red LED lit indicates self test failure. |
To control the MGX 8230, you can use the Cisco WAN Manager (formerly StrataView Plus) application for connection management, the CiscoView application for hardware configuration, and a command line interface for low-level control. The firmware determines the available functionality, and you can download firmware to upgrade functionality through a TFTP application on a workstation or a PC.
The current status and configuration parameters of the MGX 8230 modules reside in an SNMP Management Information Base (MIB). Firmware updates the MIB as changes in status and configuration occur.
You can control most of the MGX 8230 functions through the graphical interface in the Cisco WAN Manager application and CiscoView for the MGX 8230.
The control port (SLIP protocol only), the LAN (ethernet) port, and the in-band ATM connection (feeder application only) all support the CLI (via telnet), TFTP, and SNMP protocols for communicating with the MGX 8230 IP + ATM multiservice gateway or an MGX 8850/8250 switch.
This section describes the possible impact of installing a Service Resource Module-3T3 (MGX-SRM-3T3/B) on the service modules it supports. The MGX-SRM-3T3/B (or "SRM" for short) can provide 1:N redundancy for the T1 and E1 cards as well as bulk distribution for T1 cards. It has no communication with higher speed service modules, such as the MGX-FRSM-2CT3 and MGX-FRSM-HS2. See Figure 1-23 for an illustration of the MGX-SRM-3T3/B front card and the MGX-BNC-3T3-M back card.
The multifunction SRM has the following capabilities:
The following are card-level characteristics that apply to the SRM installation:
The use of bulk distribution affects the requirements for SRM and service module back cards:
For bulk distribution, the T3 lines connect to an external multiplexer. The T1 lines on the other side of the multiplexer connect to the CPE. The SRM converts the received traffic from its T3 lines to T1 channels and sends the data to linked service modules. For instructions on linking T1 channels and card slots to the MGX-SRM-3T3/B, see "Configuring the MGX 8230."
For bulk distribution of T1 lines, note the following about the MGX-SRM-3T3/B:
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Note Upon replacing the failed card, you must switch back to normal operation because the switch does not automatically do so. |
All statistics counters available in MGX 8850 are supported by the MGX 8230. There will be no change in the command line interface from MGX 8850. See Appendix A for a listing of the supported statistics.
The Add Shelf command on IGX has been modified to support adding an MGX 8230 shelf on the UXM.
The MGX 8230 provides the same alarm and error handling as SWSW Release 9.2 and MGX 8850 Release 1.1.
Posted: Thu Aug 24 09:00:17 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.
