5-19
Configuring Serial Interfaces for E1- and T1-Carrier Lines
Troubleshooting a Serial Connection
Table 5-1. Check the LEDs
No Light
Ensure that you are checking the LED that corresponds to the slot where the
serial module is installed. Next, view the status of the serial interface by
entering:
ProCurve# show interfaces serial <slot>/<port>
If the serial interface is administratively down, move to the serial interface
configuration mode context and enter:
ProCurve(config-ser 1/1)# no shutdown
The status of the interface should change.
Red Light
If the LED is red, the interface is administratively up, but it is receiving alarms.
View the status of the serial interface by entering:
ProCurve# show interfaces serial <slot>/<port>
Color Meaning Action
no light No module is installed, or the interface is not
activated.
•Use the show interfaces serial <slot>/<port>
command to determine if you need to activate the
interface.
• If the line is administratively down, enter no
shutdown.
red Interface is activated, but there are alarms. • Use the show interfaces serial <slot>/<port>
command to determine what alarms are being
reported.
yellow The interface is in loopback mode. • Contact the public carrier to cancel the loopback
test. Loopback commands are not available from
the serial interface configuration mode context.
green The Physical Layer is up. • Enter the show interfaces serial <slot>/<port>
command to ensure that you have configured the
correct protocol for the line. (The protocol is the
logical interface.)
• Check the status of the logical interface and follow
the troubleshooting steps for the protocol you are
using.
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