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The chapter introduces and describes the Service Expansion Shelf (SES). In addition, it provides brief functional overviews of the two current SES applications: SES as an IGX feeder and SES PNNI controller for the BPX (and in the future for the IGX).
This chapter includes the following sections:
The SES is a 12-slot chassis with horizontally mounted processor modules, service modules, and backcards. Built with the MGX 8850 architecture, the SES accepts the same double-height and single-height service modules as the MGX 8850, with a couple exceptions. The processor switching module (SES-PXM) for the SES is not identical to the MGX 8850 PXM. The SES-PXM is keyed so it will not fit into an MGX 8850 card slot. In addition, the SES does not support the service redundancy module (SRM), the route processor module (RPM), or the Voice Interface Service Module (VISM) of the MGX 8850. (The RPM and VISM will be supported in a release of the MGX 8830.)
The SES currently has two main applications
Figure 1-1 shows the SES with its door attached. Note that there light pipes in the door that display the status of the processor models (SES-PXMs). Figure 1-2 is a conceptual drawing of an SES showing the dimensions and the slot numbering. The slot numbering is as it appears from the front of the SES; slots 8 and 9 only refer to back card slots, however.
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Note Even though the card slots in an SES 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 SES processor and service module cards are a subset of the MGX 8850 cards which are installed vertically in an MGX 8850 chassis. |
For the first release of SES IGX feeder, all features available in MGX 8850 release 1.1 will be available. The features include:
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Note No 1:1 redundancy for T1/E1 service modules. This feature will be supported in a later release. An upgrade to the service module back cards and to the service module and PXM software will be required. |
The SES 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 based on standardized interworking methods. When the SES is used as a feeder, it uses a single port to communicate the aggregated traffic over an ATM interface with an IGX 8400 series switch.
The SES supports up to 80 channelized or non-channelized T1 and E1 interfaces on a single switch. These interfaces support:
Frame-based services on T3 and E3 high speed lines are also supported.
The SES 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 SES 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 SES.
This section includes:
Depth | 23.5 inches (excluding cable management) |
Width | 19.00 inches (including front rack-mounting flanges) |
Height | 12.25 inches (excluding optional AC Power Tray) |
Height | 14.00 inches (including optional AC Power Tray) |
The SES chassis has two dedicated slots for the SES-PXM, and ten single-height slots (five double-height slots) for service modules, as shown in Figure 1-2. One additional feature available only on the SES 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 - 14. Since front slots 1 and 2 are always double-height for SES-PXM 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.
Figure 1-3 is a front view of an empty SES chassis and Figure 1-4 is a rear view.
The SES 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 SES 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 SES, an optional AC power supply tray is attached to the bottom of the SES card cage at the factory. The AC power supply tray is 1 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 48V DC 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 (48 Vdc ± 10%). The SES can support 2 DC power sources and thus has rear panel slots for 2 DC PEMS. Figure 1-6 illustrates a DC PEM.
The DC PEMs incorporate the following features:
The SES incorporates a fan tray assembly (with 8 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 SES fan tray assembly.
The cooling system incorporates the following design features:
The SES architecture is built around the switching fabric on the processor switching module (SES-PXM), the backplane, and the service modules. Figure 1-8 is a very simple block diagram of the SES architecture.
The main function of the SES backplane is to connect cards together, terminate critical signals properly, provide -48Vdc power to all cards, and set ID numbers for each slot. In addition, the SES backplane interconnects both frontcards and backcards together via pass-through connectors. A software readable ID on the backplane is available for software to identify if the chassis is an SES or an MGX 8830.
The SES Cell Bus provides high-speed interface between the switch fabric and the service modules.
Figure 1-9 shows the overall cell bus distribution of SES 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 SES-PXM. A SES-PXM is able to communicate with the other SES-PXM using the slave Cell Bus port on that card. Slots 8 and 9 only refer to backcard slots.
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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 |
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The high-speed serial lines, which will be used by the PXM45 and AXSM cards in future releases, are also supported. This allows the SES chassis to support MGX 8850 Release 2 boards in the future. Three sets of serial lines will be provided from each PXM slot to each double height slot. Each serial line has a raw data rate of 1.25Gbps.
The SES supports the following processor and service modules:
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Note In this release, the SES does not support the Route Processor Module (RPM), the Voice Interface Service Module (VISM), or the Service Resource Module (SRM-3T3) of the MGX 8850. |
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Note For the BPX SES PNNI controller application, the SES contains only two SES-PXM cards, the related backcards, and no service modules. |
The SES Processor Switch Module (SES-PXM) performs shelf control and shared-memory switching functions. It also serves as a data processing and ATM interface card. The SES-PXM processor module for the SES, although functionally similar, is not interchangeable with the PXM for the MGX 8850. The standard SES-PXM can not be used in an MGX 8850, and is mechanically keyed so it can not be inserted in an MGX 8850 PXM slot. For SES release 1.0, only a four-port OC-3c version of the SES-PXM is available. The uplink back cards for the PXM are identical to the MGX 8850 PXM backcards. Only MMF and SMFIR versions of the uplink back cards are available for the SES, however. The User Interface (UI) back card for SES-PXM will be the same as that used on MGX-PXM.
Primarily, the SES- PXM controls the switch and provides 1.2 Gbps of non-blocking, shared memory switching. In addition, the PXM features:
Figure 1-10 is an illustration of an SES-PXM, in vertical orientation although the card is mounted horizontally in an SES chassis. The specifications for the SES PXM are listed in Appendix A, Technical Specifications.
The SES-PXM and its two types of back cards make up the required control card set. The following are model numbers of cards supported by the SES for this release:
The SES-PXM switch fabric delivers 1.2 Gbps non-blocking, shared-memory ATM switching and ATM trunking at OC-3 speed.
The SES supports hot insertion and removal of the SES-PXM module, as well as 1:1 hot standby redundancy for high availability. The active and redundant SES-PXM modules reside in slots 1 and 2.
The SES-PXM (see SES Architecture Simple Block Diagram) also provides the following interfaces and indicators:
The SES-PXM supports primary and secondary network synchronization and switchover. Synchronization source can be derived from:
An optional Stratum 3 clock module will be available in a future release. This module will reside on the PXM-UI back card.
The following functions are supported by the UI card:
The following environmental parameters are monitored by the SES-PXM:
Minor and major alarms will be generated when one or more environmental parameters are out of range.
SES-PXM 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 SES-PXM provides the following indicators:
SES-PXM provides three types of nonvolatile storage:
The BRAM also acts as a temporary cache. If for any reason, the hard drive fails, log information 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:
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Note The number of connections through the SES will be limited in the IGX feeder application to the number specified in the previous section "Main Features." |
The virtual path identifier (VPI)/virtual channel identifier (VCI) range for VCCs and VPCs is per UNI Specification 3.1.
The SES-PXM User Interface card (PXM-UI) provides the SES with the several user- interface ports. It mates with an SES-PXM through the backplane and is installed in a backcard slot (slot 1 or 2). As seen from the back of the SES, the PXM-UI will plug into the slot that is on the right-side of its corresponding SES-PXM. The user-interface ports provide the following functions:
Figure 1-11 illustrates an PXM-UI as it would be oriented for plugging into SES backcard slot 1 or 2. From right-to-left the PXM UI has the following physical connectors and interfaces:
The specifications for the UI interface card is listed in Appendix A, Technical Specifications.
The SES Uplink backcard, which mates with a corresponding SES-PXM through the backplane, provides the feeder trunk to the IGX switch (or the connection to the BPX switch in the PNNI controller application). This uplink backcard can provide either a multi-mode or single-mode fiber OC-3 interface:
Figure 1-12 shows an a four-port MMF backcard (MMF-4-155) in the orientation that the card will be inserted into an SES backslot. SES applications will also use an SMFIR-4-155 backcard. From the back of the SES, the uplink backcard is on the left-side of the corresponding SES-PXM. 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.
The eight-port ATM Universal Service Module (AUSM/B-8T1E1) is a multipurpose card set with eight T1 or E1 lines that can be used in either an SES or an MGX 8850 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 SES and other equipment. Consequently, AUSM IMA supports inverse multiplexed trunks between BPX 8620/IGX 8400-series network nodes through local or remote SES 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 SES-PXM the appropriate code when it recognizes the back card type. For specifications of the AUSM/B, refer to Appendix A, Technical Specifications.
Figure 1-13 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 SES.
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 eight-port T1 or E1 line modules that operate with the eight-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 1-14 illustrates a T1 backcard for an AUSM/B. Figure 1-15 illustrates the E1 backcards 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 SES backcard slot that corresponds to their mating. AUSM/B.
The Frame Relay Service Modules (FRSMs) can be used in either an SES 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 SES supports the following FRSM models:
Figure 1-16 illustrates the FRSM front cards as they would be oriented in a front card slot of an SES 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 backcards supported by the SES:
The T1 or E1 backcards for the look identical to the AUSM/B backcards shown in Figure 1-14 and Figure 1-15.
In the SES, FRSMs can have only 1:1 redundancy since the SES does not support the SRM. For 1:1 redundancy, a Y-cable is necessary. The very high speed MGX-FRSM-2CT3, MGX-FRSM-2T3E3, and MGX-FRSM-HS2/B 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.
The main function of the Circuit Emulation Service Module (CESM), which can be used in either an SES or an MGX 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 eight-port Circuit Emulation Service Module (CESM-8T1E1) lets you configure individual physical ports for structured or unstructured data transfer. Structured 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 SES supports two CESM models:
Figure 1-17 illustrates the two CESM front cards. In an SES 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 backcards appear the same as the AUSM/B backcards shown in Figure 1-14 and Figure 1-15.
Table 1-3 describes what the CESM LEDs mean.
| Type of LED | Color | Meaning |
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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. |
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Note Since there is no support for SRM, Release 1 of the SES IGX feeder will not support 1:n redundancy for T1/E1 service modules in SES. |
To control theSES, 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 SES modules reside in a SNMP Management Information Base (MIB). Firmware updates the MIB as changes in status and configuration occur.
You can control most of the SES functions through the graphical interface in the Cisco WANManager application Release 9.2.
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 SES (or an MGX 8850 switch).
All statistics counters available in MGX 8850 release 1.1 are supported by the SES. There will be no change in the command line interface from MGX8850. See Appendix A for a listing of the supported statistics.
The Add Shelf command on IGX has been modified to support adding an SES shelf on the UXM.
The SES provides the same alarm and error handling as SWSW Release 9.2 and MGX 8850 Release 1.1.
All functions supported on IGX release 9.2 are supported when an SES is added as an IGX feeder. This includes features such as ports and trunks, virtual trunks on UXM etc..
Switch software Release 9.2 supports UXM as feeder trunks to the SES. Only the MMF and SMFIR backcards for the UXM can be connected to an SES uplink backcard.
Figure 1-18 illustrates a typical configuration for an network with an SES feeder to the IGX.
The following cards are supported as end points to SES on the IGX. All physical interfaces to these cards are supported.
Within an IGX/BPX network with SES as feeders to the IGX, the following trunks are supported:
A BPX interface cannot be used as an end point on an SES connection. The BPX switch will function as a routing nods within the IGX/BPX network, however.
| From | To |
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SES-CESM | SES-CESM through IGX/BPX network |
SES-FRSM | SES-FRSM through IGX/BPX network |
IGX-UFM | |
IGX-UXM with Service Interworking | |
SES-AUSM | SES-AUSM |
IGX-UXM | |
IGX-UFM with Service Interworking |
The Cisco BPX SES PNNI Controller is a Service Expansion Shelf (SES) controller collocated with a BPX 8600 series switch to provide Private Network to Network Interface (PNNI) signaling and routing for the establishment of ATM switched virtual circuits (SVCs) over a BPX 8600 wide area network. In this application, every BPX 8600 series switch that is going to perform PNNI signalling and routing will have a BPX SES PNNI Controller attached to it. The BPX SES PNNI controller uses Cisco's virtual switch interface protocol to control the BPX switch for it's networking application. The combination of a BPX SES PNNI controller and a BPX 8620 switch will be referred to as a BPX PNNI node in this manual.
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Note The Service Expansion Shelf (SES) is a flexible chassis which is used in several WAN switching applications. It other words, it is not used exclusively as the BPX SES PNNI controller. When used as the BPX SES PNNI controller, the SES only contains two switch processor modules (PXMs) and their appropriate backcards. The remaining 5 slots, which are used to support Service Modules in other configurations of the SES, are not used in this application. |
The BPX PNNI node adds PNNI routing and ATM switched virtual circuits to a traditional Cisco WAN switching network. The network created out of BPX PNNI nodes is enhanced for SVCs and also supports traditional ATM and Frame Relay permanent virtual circuits (PVCs) in a separately partitioned AutoRoute network, as illustrated in Figure 1-19.
ATM switched virtual circuits (SVCs) are ATM connections setup and maintained by a standardized signaling mechanism between ATM CPE (ATM end systems) across a Cisco WAN switching network. ATM SVCs are created on user demand and removed when the call is over, thus freeing up network resources.
An additional feature of the BPX PNNI node is its use of the Private Network to Network Interface (PNNI) routing protocol. Defined by the ATM Forum for ATM networks, PNNI provides a dynamic routing protocol, is responsive to changes in network resource availability, and will scale to large networks.
BPX PNNI node resources, such as port virtual path identifier (VPI) range and bandwidth and trunk bandwidth, are partitioned between SVCs and PVCs. Resource partitioning provides a firewall between PVCs and SVCs so that problems with CPE or large all bursts do not affect the robustness and availability of PVC services.
The Cisco BPX SES PNNI Controller Software Configuration Guide contains detailed information about the SES as a PNNI controller for the BPX.
Posted: Thu Mar 30 19:18:29 PST 2000
Copyright 1989 - 2000©Cisco Systems Inc.
