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Cisco MGX 8850 Multiservice Switch Installation and Configuration
Release 1.1.31, Part Number 78-11223-03 Rev. B0, May 2005
Chapter 2 Module and Service Descriptions
Processor Switching Module
PXM1 Features
The PXM1 (see Figure 2-1) is a combination ATM switching fabric, data processing, and ATM interface
card. This module combines a 1.2 Gbps shared-memory switching fabric with integrated trunking at
speeds up to OC-12. The switching fabric provides 1.2 Gbps of non-blocking switching capacity, while
the processor provides the control plane that delivers IP+ATM networking software, diagnostics, and
performance monitoring.
The PXM provides integrated switching, processing, and broadband interfaces to provide the following
high-performance switching and trunking features:
• 1.2-Gbps non-blocking switching
• Integrated T3/E3, OC-3c/STM-1, OC-12c/STM-16
• ATM trunking
• Linear Automatic Protection Switching for the SONET interfaces.
Note APS is available only for the “B” models of the OC-3 and OC-12 uplink cards.
• Hot card insertion/removal
• 1:1 hot standby redundancy
• User-selectable primary and secondary clock sources with graceful switchover
• Internal Stratum-4 or optional Stratum-3, external BITS, or inband clock sources
• Inband management or out-of-band via EIA/TIA-232 or 10BaseT control ports
• Narrowband service modules
• Broadband trunking support
• DSO to OC-12c/STM-4 interfaces supported
PXM1 Illustration and LED Description
PXM1 provides connectors for external audio and visual alarms. The interface can either be always open
or always closed. Major and minor alarms are controlled separately. An alarm cutoff button is accessible
from the front. A history LED is set when the alarm cutoff button is pressed. The history LED can be
cleared by pressing the history clear button on the faceplate.
The PXM1 provides the following indicators:
• System Status Active/Standby/Fail/standby update (green/yellow/red/flashing yellow)
• Critical alarm (blue)
• Major alarm (red)
• Minor alarm (yellow)
• DC OK A (green = OK, red = not OK)
• DC OK B (green = OK, red = not OK)
• ACO (green)
• History (green)