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Cisco MGX 8950 Hardware Installation Guide
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Chapter 1 Product Overview
System Hardware Components
Note The XM-60s do not have corresponding back cards.
The XM-60 provides the following features:
• Support for 60, 120, 180, or 240 Gbps of cross-point switching capacity
• Dynamic sharing of capacity across multiple Cisco XM-60s, allowing for N + 1 redundancy
• Data forwarding capabilities in the event of a control processor failure, since the switching module
is separate from the control processor
• An aggregate bandwidth of 10 Gbps per slot
• Four switch ASICs and four serial links to each AXSM slot (one serial link per switch ASIC)
• Two serial links to PXM45/Bs from the upper two XM-60s (slots 9 and 10)
The XM-60 performs the following functions:
• Extracts in-band requests from the AXSMs and PXM45/Bs
• Schedules and grants access to the AXSMs and PXM45/Bs
• Performs spatial multicast functions to the egress slots
• Provides counters for error statistics on a per serial link basis
• Provides an interface to the CPU on the PXM45/Bs for statistic collections