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Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
Cisco MGX 8220 System Overview
• ATM UNI service module for T1, Version B (MGX-AUSM-8T1/B)
This card provides interfaces for up to eight T1 lines, each of which can support one T1 ATM UNI
or ATM NNI plus additional support for standards-based IMA. Version B adds the capability to
extract clocking information from the T1/E1/IMA trunk to feed into the Cisco MGX 8800 system
clock. This supports ATM forum-compliant IMA (1.0 spec).
• ATM UNI service module for E1, Version B (MGX-AUSM-8E1/B)
This card provides interfaces for up to eight E1 lines, each of which can support one E1 ATM UNI
or ATM NNI plus additional support for standards-based IMA. Version B adds the capability to
extract clocking information from the T1/E1/IMA trunk to feed into the Cisco MGX 8800 system
clock. This supports ATM forum-compliant IMA (1.0 spec).
Inverse Multiplexing for ATM Trunk Modules
• Inverse multiplexing for ATM trunk module—T3 to T1 (AX-IMATM-8T1/B)
This card acts as an extension of the Cisco BPX BNI card and permits the Cisco BPX ATM trunk
to be used over multiple (up to 8) T1 lines instead of a single T3 line.
• Inverse multiplexing for ATM trunk module—E3 to E1 (AX-IMATM-8E1/B)
This card acts as an extension of the Cisco BPX BNI card and permits the Cisco BPX ATM trunk
to be used over multiple (up to 8) E1 lines instead of a single E3 line.
Circuit Emulation Service Modules
• Circuit emulation service module for T1 (AX-CESM-4T1)
This card provides interfaces for up to four T1 lines, each of which is a 1.544 Mbps unstructured
synchronous data stream.
• Circuit emulation service module for E1 (AX-CESM-4E1)
This card provides interfaces for up to four E1 lines, each of which is a 2.048 Mbps unstructured
synchronous data stream.
• Circuit emulation service module for T1 (AX-CESM-8T1)
This 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 (AX-CESM-8E1)
This card provides interfaces for up to eight E1 lines, each of which is a 2.048 Mbps structured or
unstructured synchronous data stream.
Service Resource Modules
• Service resource module (AX-SRM-T1E1/B)
The optional SRM-T1E1/B provides three major functions for service modules; bit error rate tester
(BERT) of T1 and E1 lines and ports, loops back of individual nx64 channels toward the customer
premises equipment (CPE), and 1:N redundancy for the service modules.
• Service resource module (MGX-SRM-3T3)
The SRM-3T3 provides three major functions for service modules; bit error rate tester (BERT) of
T1 and E1 lines and ports, loops back of individual nx64 channels toward the CPE, and 1:N
redundancy for the service modules. The SRM-3T3 provides the additional capability of supporting
multiple T1 channels over T3 lines on the SRM and distributing those channels to T1 service
modules in the shelf.