Specifications

CHAPTER

Common Equipment Description2-1

Common Equipment Description

This chapter provides a description of the common equipment hardware modules that make up the

MGX 8220 shelf Release 4.1. The optional service modules are described in Chapter 4, “MGX 8220

Service Modules”.

Common equipment of the MGX 8220 shelf consists of the following modules:

• MGX 8220 hardware shelf, which includes:

— card cage

— backplane

— power entry module housing

• Core cards installed in the shelf, which include:

— MGX 8220 Shelf Controller (ASC)

— Broadband Network Module (BNM)

— Service Resource Module (SRM) (optional)

• Main cooling assembly

• Cooling booster assembly (for certain multi-shelf configurations only)

• Power entry module (for DC powered systems only)

• AC power assembly (for AC powered systems only)

• Optional cabinet

System Overview

The MGX 8220 shelf is a 19 inch rack mountable shelf which provides 16 slots for holding the

modules (card sets) that provide the MGX 8220 functionality. Each slot is designed to house two

cards, a front card and a back card. Cards are installed in a slot as a two card set referred to as a

module. A backplane runs across all 16 slots which provides signal connections between front and

back cards and between slots. The backplane also provides power distribution to all slots from dual

(redundant) power entry modules installed in the bottom of the shelf.

All external line connections (for example, Frame Relay lines, the ATM trunk line and control

console RS-232 lines) are made on the back cards at the rear of the shelf.

A cooling assembly containing the MGX 8220 cooling fans consists of a rack mounted fan unit

below the main MGX 8220 shelf and either a plenum or spacer unit which is mounted above the

shelves. The cooling assembly is capable of cooling up to two MGX 8220 shelves in the same rack.