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CHAPTER
4-1
Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
4
MGX 8220 Service Modules
Introduction
The MGX 8220 shelf contains 16 slots. Each slot can accommodate a front card and a back card. Six
slots are reserved for common equipment modules as described in Chapter 2, “Common Equipment
Description”.
The remaining ten slots (slots 5 through 14) are reserved for Service Modules (SMs). Service Modules
provide functionality for such services as Frame Relay, ATM, and Circuit Emulation.
This chapter describes the Service Modules supported by the MGX 8220.
• Frame Relay Service Modules (FRSMs), page 4-2
• ATM UNI Service Module, page 4-17
• Inverse Multiplexer for ATM Trunk Module, page 4-23
• Circuit Emulation Service Modules, page 4-26
• Service Module Back Cards, page 4-32
Although Service Resource Modules (SRMs) are categorized as core equipment, they also provide
optional functions for the SMs.
• The AX-SRM T1/E1 can provide 1:N redundancy for the other service modules. The SRM is
described in Service Resource Modules, page 2-22
• The AX-SRM-3T3 provides three T3 service lines to carry multiple T1 service lines. The SRM-3T3
is described in the AX-SRM-3T3, page 2-24