Yellow Light - HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual

Configuring Serial Interfaces for E1- and T1-Carrier Lines
Troubleshooting a Serial Connection
5-20
• If you have an extra X.21, V.35, or EIA 530 cable, try using that cable
to connect the serial module to the CSU/DSU.
• Check the LEDs on the CSU/DSU and ensure that it is up. The CSU/
DSU may be turned off, or it may have experienced a hardware failure.
The serial module is misconfigured.
• Compare the list of settings that you received from your public carrier
with the settings configured on the serial module. To view both the
settings you have entered and the default settings for the interface,
enter the following command. (See Figure 5-11.)
ProCurve# show running-config interface serial <slot>/<port> verbose
• Correct any settings so that the configuration for the serial module
matches that used on CSU/DSU.
interface ser 2/1
description
et-clock-source txclock
no ignore dcd
no invert txclock
no invert rxclock
no invert etclock
serial-mode V35
alias
snmp trap link-status
no shutdown
Figure 5-11. Viewing the Output for the show running-config interface serial
verbose Command
The public carrier is experiencing a problem. For example, the carrier line
may be down between the CSU/DSU and the CO, or the line may not be
properly connected to the CSU/DSU.
• Contact your public carrier. You should be prepared to explain the
settings that are configured on the serial interface and to answer
questions about the troubleshooting steps you have taken.

Yellow Light

A yellow light indicates a loopback test. Because you cannot initiate a loop-
back test from the serial interface configuration mode context, you must
contact your public carrier to cancel the loopback test or to determine why it
was issued.