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Cisco MGX 8240 Hardware User’s Guide
Release 3.0, Part Number 78-10728-01, July 2000
Chapter 2 Description
The PSM I/O module provides external connectivity (physical termination) on behalf of a PSM module.
The PSM I/O module normally connects to the PSM module across the midplane in the same slot
position. If a PSM module fails, the I/O module can be switched (controlled by the backup PSM module)
to route its midplane connections to the backup PSM module. The PSM I/O module provides the
following external connectors: