Yellow Light; Green Light; Solving A Specific Problem: The Line Between The Serial Module And The Csu/Dsu Keeps Going Down - HP ProCurve 7000dl Series Basic Management And Configuration Manual

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.

Green Light

If the serial interface is up, you should begin troubleshooting the logical
interface. See Chapter 6: Configuring the Data Link Layer Protocol for E1,
T1, and Serial Interfaces.
Solving a Specific Problem: the Line Between the Serial
Module and the CSU/DSU Keeps Going Down
If the line between the serial module and the CSU/DSU keeps going down, you
may want to configure the router to ignore data carrier detected (DCD)
signals. Serial cables supported by the ProCurve Secure Router consist of 26
leads. Each lead either:
transmits a specific signal from the router to the CSU/DSU
receives a specific signal from the CSU/DSU
Configuring Serial Interfaces for E1- and T1-Carrier Lines
Troubleshooting a Serial Connection
5-21