MGX 8230 Installation and Configuration, Release 1.0
MGX 8230 Overview
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MGX 8230 Overview

Table Of Contents

MGX 8230 Overview

MGX 8230

Main Features

Standards-Based Conversion to ATM

MGX 8230 Physical Description

MGX 8230 Chassis/Enclosure

MGX 8230 Power System

Optional AC Power Supply

DC-Powered MGX 8230

Cooling System

MGX 8230 Architecture

Cell Bus

MGX 8230 Processor and Service Modules

MGX 8230 Processor Switch Module (PXM1)

Clocking Options

Management Interfaces

System Environment Monitoring

Alarm Circuit and Indicators

Physical Layer OC-3c/STM-1 Interface

ATM Layer

PXM1 User Interface Back Card

MGX 8230 OC-3 Uplink Back Card

OC-12 Uplink Back Card

SMFIR-1-622 Back Card

MGX-FRSM-2T3E3 Front Card

BNC-2T3 Back Card

BNC-2E3 Back Card

ATM Universal Service Module

AUSM/B Front Card

AUSM/B Back Cards

Frame Service Module Features

FRSM Models

FRSM Redundancy

Circuit Emulation Service Module 8T1E1

Structured Data Transfer

Unstructured Data Transfer

CESM Models

Redundancy Architecture

MGX 8230 Management

Service Resource Module

General Installation Requirements for the MGX-SRM-3T3/B

Bulk Distribution and Redundancy Support

Statistics and Command Line Interface

Alarm and Error Handling


MGX 8230 Overview


The chapter introduces and describes the MGX 8230.

This chapter includes the following sections:

MGX 8230 Physical Description

MGX 8230 Processor and Service Modules

MGX 8230 Management

Redundancy Architecture

MGX 8230

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.

Figure 1-1 MGX 8230 with Door Attached

Figure 1-2 MGX 8230 Dimensions


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.


Main Features

Release 1.0 of MGX 8230 feeder includes:

PXM1 with 4-port OC-3c ATM port.

MMF and SMF IR back cards are supported.

PXM1 ports are used as feeder trunks only.

Core redundancy for PXM1.

Environmental monitoring.

ATM, Frame Relay, and Circuit Emulation service modules.

AUSM-8T1/E1/B with RJ48-T1/E1 and SMB E1 back card with UNI and IMA support.

FRSM-8T1/E1 with RJ48-T1/E1 and SMB E1 back cards.

FRSM-2T3E3 with BNC-2T3/E3 back cards.

FRSM-HS2 with 2 port HSSI back card.

FRSM-2CT3 with BNC-2T3 back card.

CESM-8T1/E1 with RJ48-T1/E1 and SMB E1 back cards.

1:1 redundancy for T3/E3 cards.

1:1 redundancy for T1/E1 service modules.

Graceful upgrade.

1000 connections per card, 4000 connections per shelf

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 backplane supports a minimum of 1.2 Gbps of non-blocking switching and has a high-end limit of 21 Gbps with the PXM1. Individual line rates can range from DS0 through OC-3.

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 Relay UNI and NNI

ATM UNI, NNI, and FUNI

Frame Relay-to-ATM network interworking

Frame Relay-to-ATM service interworking

Circuit emulation services

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.

Standards-Based Conversion to ATM

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:

Circuit emulation services uses AAL1.

Frame Relay-to-ATM network interworking uses AAL5 and Frame Relay Service Specific Convergence Sub-layer (FR-SSCS).

Frame Relay-to-ATM service interworking uses both transparent and translation modes to map Frame Relay to native ATM AAL5.

Frame Forwarding uses AAL5.

Appendix A, "Technical Specifications" lists all the relevant specifications and conformance information for the MGX 8230.

MGX 8230 Physical Description

This section includes:

MGX 8230 Chassis/Enclosure

MGX 8230 Power System

Cooling System

MGX 8230 Architecture

Cell Bus

MGX 8230 Chassis/Enclosure

The MGX 8230 can be either rack mounted in a 19-inch rack, or fitted with side panels to be a free-standing box, referred to as a stand-alone MGX 8230. An optional mounting bracket kit is available for mounting in 23-inch racks. The overall dimensions for the chassis are:

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 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.

Figure 1-3 MGX 8230 Card Cage, Front View

Figure 1-4 MGX 8230 Card Cage, Rear View

MGX 8230 Power System

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.

Optional AC Power Supply

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.

Figure 1-5 AC Power Supply Module, Rear View

Each AC Power Supply Module incorporates the following features:

1 rack unit high

An output capacity of 1200 Watts at -48 VDC

O-ring diode

EMI filtering

Cooling fan

Power switch

DC and AC status LEDs

DC-Powered MGX 8230

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:

Hot swappable

O-ring diode

EMI filtering

Figure 1-6 MGX 8230 DC Power Entry Module

Cooling System

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:

-48 VDC fans with rotation sensing

N+1 fan redundancy

Hot pluggable (if done quickly) Fan Tray Assembly

Noise level < 65 dBA

Figure 1-7 MGX 8230 Fan Tray Assembly

MGX 8230 Architecture

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 cell bus controllers (CBCs) are application specific integrated circuits (ASICs) and provide the interface between the switching fabric and the service modules.

Figure 1-8 MGX 8230 Architecture Simple Block Diagram

Cell Bus

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.

Each PXM1 supports eight master cell buses and one slave cell bus connected to the backplane. The service modules have two slave cell bus ports, one from each PXM1. The master cell bus ports are CB0 to CB7 and the PXM1 slave ports are referred to as 7S and 8S in Table 1.

A cell bus comprises the group of signals used to transfer data between the PXM and a service module. CB 0, 6, 1, 2, 4, and 3 are dedicated service modules, CB5 supports physical slot 6. CB7 supports physical slot 13 as well as the alternate PXM1's slave port.

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.

Figure 1-9 Cell Bus Distribution

Table 1-1 Cell Bus Distribution

 
Left Side Chassis
Right Side Chassis
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

   

x

                 

CB1_A/B

       

x

             

CB2_A/B

             

x

       

CB3_A/B

                 

x

   

CB4_A/B

   

       

x

     

CB5_A/B

       

x

           

CB6_A/B

     

x

   

         

CB7_A

 

x

         

x

 

CB7_B

x

           

x

 

MGX 8230 Processor and Service Modules

The MGX 8230 supports the following processor and service modules:

MGX 8230 Processor Switch Module (PXM1)

ATM Universal Service Module

Frame Service Module Features

Circuit Emulation Service Module 8T1E1

Service Resource Module (SRM-3T3)


Note The MGX 8230 does not support the Route Processor Module (RPM) or the Voice Interface Service Module (VISM) of the MGX 8850/8250.


MGX 8230 Processor Switch Module (PXM1)

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:

A 4.0-Gigabyte hard disk drive that holds software, firmware for all the cards, and a substantial amount of other information.

Environmental monitoring (cabinet temperature, fan speed, and power supply voltages).

Hot swappable, 1:1 redundancy.

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:

PXM1-4-155, PXM1-1-622, and PXM1-2-T3E3

PXM-UI (user interface back card)

MGX-MMF-4-155 (uplink back card)

MGX-SMFIR-4-155 (uplink back card)

MGX-SMFLR-4-155 (uplink back card)

MGX-BNC-2-T3 (uplink back card)

MGX-BNC-2-E3 (uplink back card)

MGX-SMFIR-2R-1-622 (uplink back card)

MGX-SMFLR-1-622 (uplink back card)

Figure 1-10 MGX 8230 PXM1

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:

Four LED indicators (card status, critical/major/minor network alarms, LAN control port activity detect, and DC power status)

Up to four LED indicators for Uplink port, depending on the number of uplink ports supported.

Support for two back cards: User Interface and Uplink

Clocking Options

The PXM1 supports primary and secondary network synchronization and switchover. Synchronization source can be derived from:

T1/E1 BITS input (the E1 BITS input will accept either E1 data signal or E1 synchronization signal)

Recovered clock from any uplink port

Internal Stratum 4 oscillator

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.

Management Interfaces

The following functions are supported by the UI card:

User and management interface to an ASCII terminal or workstation

Network synchronization for the shelf

Central office compatible major/minor alarm interface

System Environment Monitoring

The following environmental parameters are monitored by the PXM1:

-48 VAC power supply status

5V and 3.3V onboard power status

Cooling fan revolution

Enclosure temperature

Minor and major alarms will be generated when one or more environmental parameters are out of range.

Alarm Circuit and Indicators

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:

System Status Active/Standby/Fail/standby update (green/yellow/red/flashing yellow)

Critical alarm (blue)

Major alarm (red)

Minor alarm (yellow)

DC OK A (green = OK, red = not OK)

DC OK B (green = OK, red = not OK)

ACO (green)

History (green)

Port activity (active and clear = green, remote alarm = yellow, local alarm = red)

LAN activity (flashing green)

PXM1 provides three types of non-volatile storage:

Flash: This is used to store boot code for the processor. The boot code can be upgraded in the field by a software download.

Hard drive: The PXM1 hard drive is a 2.5-inch, 4.0 -Gbyte IDE drive. Configuration information and code for the PXM and service modules are stored on the drive, and can be updated during system operation or by user download.

Battery backed up RAM: The BRAM is used to store bookkeeping information for the card. Information stored includes:

Identifiers such as board hardware revision, serial number, and PCB part number

MAC address of the PXM

Hard drive parameters such as number of heads and cylinder size

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.

Physical Layer OC-3c/STM-1 Interface

The OC-3c/STM-1 interface provides the feeder trunk uplink with:

Four OC-3c/STM-1 (155.520 Mbps) ports

Trunk or port interface mode

Cell transfer rate of 353,208 cells per second

Compliance with SONET standards (Bellcore GR-253-CORE and ANSI T1.105)

Compliance with SDH standards (ITU-T G.707, G.957, and G.958)

1:1 PXM1 redundancy

SONET APS

Linear APS

ATM Layer

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:

32,000 connections per card

4096 UNI connections per card

The virtual path identifier (VPI)/virtual channel identifier (VCI) range for VCCs and VPCs is per UNI Specification 3.1.

PXM1 User Interface Back Card

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:

User and management interface to an ASCII terminal or workstation

Network synchronization for the shelf

Central office-compatible major/minor alarm interface

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:

RJ-45 T1 clock input—BITS clock source

RJ-45 Maintenance port—RJ-45 connector, EIA/TIA 232, DTE mode, asynchronous interface, 19200 bits per second, 1 start bit, 1 stop bit, no parity bits.

RJ-45 Control port—EIA/TIA 232, DTE mode, asynchronous interface, 9600 bits per second, 1 start, 1 stop, no parity.

RJ-45 LAN port—10BaseT, 802.3 Ethernet

SMB connector E1 clock input—BITS clock source

DB-15 female connector for alarm outputs

Figure 1-11 PXM1 User Interface Back Card

The specifications for the UI interface card are listed in Appendix A, Technical Specifications.

MGX 8230 OC-3 Uplink Back Card

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:

MGX-MMF-4-155 (multi-mode fiber uplink back card)

MGX-SMFIR-4-155 (single-mode fiber intermediate reach uplink back card)

MGX-LMFLR-4-155 (single-mode fiber long reach uplink back card)

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.

Figure 1-12 Four-Port OC-3 Uplink Back Card

OC-12 Uplink Back Card

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.

Figure 1-13 OC-12 Long Reach Back Card

SMFIR-1-622 Back Card

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 1-14 Intermediate Reach OC-12 Back Card

MGX-FRSM-2T3E3 Front Card

Figure 1-15 shows the MGX-FRSM-2T3E3 front card. Refer to "Technical Specifications." for detailed information on this card.

Figure 1-15 MGX-FRSM-2T3E3

BNC-2T3 Back Card

An illustration of the two-port T3 back card appears in Figure 1-16. For card specifications, refer to "Technical Specifications."

Figure 1-16 BNC-2T3

BNC-2E3 Back Card

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."

Figure 1-17 BNC-2E3

ATM Universal Service Module

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.

ATM UNI card with high port density: with AUSMs in all 10 MGX 8230 service module slots, an MGX 8230 can support up to 80 individual T1 or E1 lines. In UNI/NNI mode, an individual card set can support 1000 data connections and 16 management connections.

UNI/NNI access to CPE or other networks: this application provides access over a UNI to IMA-based CPE or an NNI to another ATM network.

NNI/NNI access to CPEs: this application supports ATM ports over a single T1 or E1 line and IMA ports over multiple T1 or E1 lines (connected to IMA-based CPE).

Classes of service: CBR, VBR, ABR, and UBR with per-VC queuing on ingress and multiple class-of-service queues on egress.

Statistics collection.

Support for VP connections.

Network synchronization by using a line as a clock source.

Support for BERT functionality with loopback pattern generation/verification on individual lines.

1:1 redundancy through a Y-cable for E1 operation using an SMB-8E1 back card.

Automatic card-restore.

SNMP and TFTP to support card and connection management

Resource partitions for individual network control applications, such as a Multiprotocol Label Switching (MPLS) controller.

AUSM/B Front Card

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.

Figure 1-18 AUSM/B-8T1E1 Front Card

Table 1-2 describes what the AUSM/B LEDs indicate.

Table 1-2 Eight-Port AUSM/B LED Indicators

Type of LED
Color
Description

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.

   

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.

   

Fast blink with Standby LED on means card is receiving firmware.

   

Fast blink indicates the service module is passing BRAM channel information to the PXM.

   

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).

   

Steady Red with Active LED on indicates the card was active prior to failing.

   

Steady Red with Standby LED on indicates the card was standby prior to failing.


AUSM/B Back Cards

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:

RJ48-8T1 back card for T1

RJ48-8E1 back card for E1

SMB-8E1 back card for E1

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.

Figure 1-19 Standard RJ-48 Back Card for the MGX-AUSM/B-8T1

Figure 1-20 Standard RJ-48 and SMB Back Cards for the MGX-AUSM/B-8E1

Frame Service Module Features

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:

Frame Relay-to-ATM Network Interworking (NIW) as defined in FRF.5.

Frame Relay-to-ATM Service Interworking (SIW) with or without translation as in FRF.8.

Frame forwarding.

ATM Frame-UNI.

Maximum frame sizes of 4510 bytes for Frame Relay and 4096 bytes for ATM-FUNI

Per-virtual-circuit (VC) queuing in the ingress direction (towards the cell bus). Traffic arriving at the network on a connection has a dynamically assigned buffer at the entrance to the switch. Buffer size depends on the amount of traffic and the service-level agreement (SLA).

Advanced buffer management. When a frame arrives, the depth of the queue for the LCN is compared against the peak queue depth scaled down by a specified factor. The scale-down factor depends on the amount of congestion in the free buffer pool. As the free buffer pool begins to empty, the scale-down factor is increased, preventing an excessive number of buffers from being held up by any single LCN.

Multiple priority level queuing to support class of service (CoS) in the egress direction. The FRSM services egress queues according to a weighted priority. The priority depends on the percentage of logical port bandwidth needed by all connections of a particular type on a logical port. The FRSM supports:

A high-priority queue

A real-time Variable Bit Rate (rt-VBR) queue

A common queue for non-real-time Variable Bit Rate (nrt-VBR) and ABR connections

A UBR queue

Initial burst per channel. After a period of silence, the FRSM sends a configurable number of bytes at a peak service rate.

The ForeSight option. This Cisco mechanism for managing congestion and optimizing bandwidth continuously monitors the utilization of ATM trunks. It proactively adjusts the bandwidth for connections to avoid queuing delays and cell discards.

Consolidated Link Layer Management (CLLM), an out-of-band mechanism to transport congestion related information to the far end.

Dual leaky bucket policing. Within the basic parameters such as committed burst, excess burst, and CIR, incoming frames go into two buckets: those to be checked for compliance with the committed burst rate and those to be checked for compliance with the excess burst rate. Frames that overflow the first bucket go into the second bucket. The buckets "leak" by a certain amount to allow for policing without disruption or delay of service.

Standards-based management tools. Each FRSM supports SNMP, TFTP for configuration and statistics collection, and a command line interface. The Cisco WAN Manager application provides full graphical user interface support for connection management. The CiscoView application provides equipment management.

MGX 8800 series network management functions, including image download, configuration upload, statistics, telnet, UI, SNMP, trap, and MIBs.

OAM features: OAM F5 AIS, RDI, end-to-end or segment loopback as well as LMI and Enhanced LMI (ANNEX A, ANNEX D, Strata LMI).

Hot-swappable redundancy (see sections for individual implementations).

Resource partitioning at the card level or port level for use by other controllers, such as a Multiprotocol Label Switching (MPLS) controller.

FRSM Models

The MGX 8230 supports the following FRSM models:

Frame Service Module for T1 (FRSM-8T1)
The FRSM-8T1 card provides interfaces for up to eight T1 lines, each of which can support one 56 Kbps or one Nx64 Kbps FR-UNI, FR-NNI port, ATM-FUNI, or a Frame Forwarding port.

Frame Service Module for T1, channelized (FRSM-8T1-C)
The FRSM-8T1-C card provides interfaces for up to eight T1 lines, each of which can support up to twenty-four 56 Kbps or Nx64 Kbps FR-UNI, FR-NNI, ATM-FUNI, or Frame Forwarding ports.

Frame Service Module for E1 (FRSM-8E1)
The FRSM-8E1 card provides interfaces for up to eight E1 lines, each of which can support one 56 Kbps or one Nx64 Kbps FR-UNI, FR-NNI, ATM-FUNI, or Frame Forwarding port.

Frame Service Module for E1, channelized (FRSM-8E1-C)
The FRSM-8E1-C card provides interfaces for up to eight E1 channelized Frame Relay lines, each of which can support multiple (up to thirty-one) 56 Kbps or Nx64 Kbps FR-UNI, FR-NNI, ATM-FUNI, or Frame Forwarding ports.

Frame Service Module for T3 and E3 (FRSM-2E3T3)
The FRSM-2E3/T3 card provides interfaces for up to two T3 or E3 Frame Relay lines, each of which can support either two T3 lines (each at 44.736 Mbps) or two E3 lines (each at 34.368 Mbps) FR-UNI, FR-NNI, ATM-FUNI, or Frame Forwarding ports.

Frame Service Module for channelized T3 (FRSM-2CT3)
The FRSM-2CT3 card supports interfaces for up to two T3 channelized Fame Relay lines, each of which supports 56 Kbps, 64 Kbps, Nx56 Kbps, Nx64 Kbps, T1 ports for a total of 256 ports that can be freely distributed across the two T3 lines.

FRSM-HS2
The FRSM-HS2 provides unchannelized Frame Relay service for up to 1000 user-connections over two HSSI lines on the SCSI2-2HSSI back card. The maximum rate for the card is 104 Mbps. Each port can operate in either DTE or DCE mode with incremental rates of N x T1 or N x E1 up to 52 Mbps.

Figure 1-21 illustrates the FRSM front cards as they would be oriented in a front card slot of an MGX 8230 chassis.

Figure 1-21 FRSM Front Cards

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:

FRSM-2CT3 front card with the BNC-2T3 back card

FRSM-2T3E3 front card with either a BNC-2T3 or a BNC-2E3 back card

FRSM-HS2, with an SCSI2-2HSSI back card

FRSM-8T1/8E1 one of the following:

RJ48-8T1-LM

RJ48-8E1-LM

SMB-8E1-LM

The T1 or E1 back cards look identical to the AUSM/B back cards shown in Figure 1-19 and Figure 1-20.

FRSM Redundancy

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.

Circuit Emulation Service Module 8T1E1

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.

Structured Data Transfer

If you configure an individual port for structured data transfer, the CESM-8T1E1 supports:

Synchronous timing.

Superframe or Extended Superframe.

N x 64 Kbps, fractional DS1/E1 service (contiguous time slots only). You can map an N x 64 Kbps channel to any VC.

CAS robbed bit for T1 (ABCD for ESF and SF frames) and CAS for E1 (channel 16). This feature applies to only AAL1 interworking conversion.

CCS channel as a transparent data channel.

A choice of partially filled cells.

Idle detection and suppression for 64 Kbps CAS connections.

Loopback diagnostics on a line or a connection (addlnloop, tstcon, and tstdelay commands).

Unstructured Data Transfer

If you configure an individual port for unstructured data transfer, the CESM-8T1E1 supports:

Synchronous or asynchronous timing at T1 (1.544 Mbps) or E1 (2.048 Mbps) rates. For asynchronous timing, you can select its basis as either SRTS or adaptive clock recovery.

The special port type framingOnVcDisconnect. This port type prevents a remote-end CPE from going to LOF by placing a line in remote loopback mode when the CESM determines that a connection deletion or suspension occurred at the network-side ATM interface.

Ability to detect and display a yellow alarm for the ESF framing on a T1 line.

Loopback diagnostics on a line or a connection (addlnloop, tstcon, and tstdelay commands).

CESM Models

The MGX 8230 supports two CESM models:

Circuit Emulation Service Module for T1 (CESM-8T1)
The CESM-8T1 card provides interfaces for up to eight T1 lines, each of which is a 1.544 Mbps structured or unstructured synchronous data stream.

Circuit Emulation Service Module for E1 (CESM-8E1)
The CESM-8E1 card provides interfaces for up to eight E1 lines, each of which is a 2.048 Mbps structured or unstructured synchronous data stream.

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:

RJ48-8T1-LM

RJ48-8E1-LM

SMB-8E1-LM

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.

Figure 1-22 CESM Front Cards

Table 1-3 describes what the CESM LEDs mean.

Table 1-3 LED Indicators for 8-Port CESM

Type of LED
Color
Meaning

PORT LED

Green

Green indicates the port is active.

 

Red

Red indicates there is local alarm on the port.

   

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.

   

Fast blink with the Standby LED indicates the card is being downloaded.

   

Fast blink indicates the service module is passing BRAM channel information to the PXM

   

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).

   

Steady Red with Active LED on indicates the card was active prior to failing.

   

Steady Red with Standby LED on indicates the card was standby prior to failing.

   

Both standby and red LED lit indicates self test failure.


Redundancy Architecture

Since the MGX 8230 chassis is a smaller form factor MGX 8850, most of the redundancy features available in MGX 8850 are available in MGX 8230 chassis. The following is a list of available redundancy features on the MGX 8230 chassis.

Dual PXM

Y-cable redundancy on PXM uplink ports

1:N redundancy for T1/E1 service modules

Eight cell buses per PXM

N+1 cooling fan redundancy

N+1 AC or DC power redundancy (optional)

1:1 Y-cable redundancy for T3/E3 interfaces

MGX 8230 Management

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.

Service Resource Module

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:

A de-multiplexing function called bulk distribution carries traffic across the distribution bus between the T3 lines on the MGX-SRM-3T3/B and the T1 service modules. Bulk distribution can greatly reduce the number of T1 lines coming into the enclosure.

1:N redundancy support for service modules with RJ-48 connectors.

Bit error rate testing (BERT) for T1 and subrate service module lines.

General Installation Requirements for the MGX-SRM-3T3/B

The following are card-level characteristics that apply to the SRM installation:

The MGX 8230 can have MGX-SRM-3T3/B cards installed in slots 7 and 14 only.

The distribution bus does not support slots 7 and 14, so any service module that uses bulk distribution or relies on the distribution bus for redundancy cannot reside in these slots.

Bulk Distribution and Redundancy Support

The use of bulk distribution affects the requirements for SRM and service module back cards:

With bulk distribution and 1:N redundancy support by way of the distribution bus, the service modules do not use back cards.

For just 1:N redundancy by way of the redundancy bus, the supported service modules must have back cards—including one special redundancy back card. E1 redundancy requires the R-RJ48-8E1 line module, and T1 redundancy requires the R-RJ48-8T1 line module.

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:

Each T3 line can support up to 28 T1 channels.

The maximum number of T1 channels an MGX-SRM-3T3/B can support at one time is 80.


Note Upon replacing the failed card, you must switch back to normal operation because the switch does not automatically do so.


Figure 1-23 MGX-SRM-3T3/B Card Set

Statistics and Command Line Interface

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.

Alarm and Error Handling

The MGX 8230 provides the same alarm and error handling as SWSW Release 9.2 and MGX 8850 Release 1.1.