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Cisco ASR 903 Router Hardware Installation Guide
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Chapter1 Cisco ASR 903 router Overview
Interface Numbering

Temperature Sensor

The Cisco ASR 903 router has a temperature sensor to detect overtemperature conditions inside the
chassis. The overtemperature detection trips at 75 degrees C +/- 5% with the ambient (inlet) trip point
at 67 degrees C. This condition is reported to the processor as an interrupt, and the software takes action
to generate the appropriate alarms.

Serial Number Label Location

Figure 1-14 shows the serial number label location on the CiscoASR 903 router.
Figure1-14 CiscoASR 903 router Serial Number Location
Interface Numbering
The Cisco ASR 903 router chassis includes:
•Six interface module slots
•Two RSP module slots
•Two power supply slots
•One fan tray slot
Each network interface on a CiscoASR 903 router is identified by a slot number and a port number.
282407
11 letters and numbers
Serial Number