Cisco ASR 903 Installation Guide

4-Port C37.94 Interface Module
The Cisco (A900-IMA4C3794) is a 4-port interface module that provides IEEE C37.94-2002 compliant Nx64
kbps optical interface ports to the router. The interfaces support 50/62.5 multimode fiber at 850nm. The
physical interfaces use 2.5mm ST connectors.
The front panel of the module consists of four ports of IEEE C37.94 interfaces.
Figure 40: C37.94 Interface Module
Figure 41: C37.94 Interface Module Front Panel
For information on LEDs, see 4-Port C37.94 Interface Module LEDs.
For more information about installing the module, see Interface Module Installation.
Blank Deflector (A900-IMA-BLNK-DEF)
The A900-IMA-BLNK-DEF is a special type of blank filler plate that can be used in empty interface module
slots. In addition to just acting as a filler for the empty slots in the router, this blank deflects additional air
towards the interface modules in the slot below it, thereby enhancing the cooling for the interface module.
The A900-IMA-BLNK-DEF is module should not be used in slot 0 in the Cisco ASR 903 Router.
Caution
For slot 0, always use the filler blank (A900-IMA-BLANK) when a blank filler needs to be used.
For more information on operating temperature, see Example: Configuration with A900-RSP3-200-S with
Blank Deflector (A900-IMA-BLNK-DEF).
Maximum Operating Ambient Temperature Support for RSP3 Modules
The router supports multiple fan trays with different cooling capacities. The maximum operating temperature
of the router using the RSP3 modules, depends on the fan tray and the interface modules used in the router.
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
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Overview
4-Port C37.94 Interface Module

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English