Troubleshooting Serial
This section describes steps you use to troubleshoot serial.
Important:
Slot 2 of the Secure Router 4134 supports only one port of any WAN data Small Module. If
you install a 2-port Small Module in Slot 2, and use the Small Module for data connections,
one port only is functional (port 1).
The following table describes the LED states for the Serial Small Module.
Table 22: Serial Module LEDs
LED Description
LINK/STAT Status of each interface:
• Off: Not connected or the interface is out of service.
• Yellow: The interface is in a loopback mode or is running
diagnostics
• Green: The link is active and receiving a valid signal
When you power on the Secure Router 2330/4134 with a serial configuration, the serial
interface software polls the port hardware status to ensure the connected cable matches
the port configuration. If a connected cable does not match the cable type and operational
mode settings, the interface LED turns red and the port hardware is disabled. This prevents
damage to internal and external hardware components.
To view serial alarms, run the following command:
show module alarms serial
Troubleshooting HSSI
This section describes steps you use to troubleshoot HSSI.
The following table describes the LED states for the HSSI Medium Module.
Table 23: HSSI Module LEDs
LED Description
STAT General module status:
Troubleshooting a physical media problem
64 Troubleshooting August 2013
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