- Enterasys Security Router User's Guide

Troubleshooting T1/E1 & T3/E3 Links
XSR User’s Guide 4-7
Troubleshooting T1/E1 & T3/E3 Links
This section describes general procedures for troubleshooting T1/E1 lines on the XSR. The
following flow diagram shows basic steps to perform.
Figure 4-2 General T1/E1 & T3/E3 Troubleshooting Flowchart
As shown in Figure 4-2, three troubleshooting actions are defined:
• T1/E1 & T3/E3 Physical Layer (Layer 1) troubleshooting (loss of signal/frame)
• T1/E1 & T3/E3 Alarm Analysis
• T1/E1 & T3/E3 Error Events Analysis
T1/E1 & T3/E3 Physical Layer Troubleshooting
This section describes the techniques and procedures to troubleshoot T1/E1 or T3/E3 physical
layer problems. The troubleshooting flowchart below displays the procedures described in the
following section.
Execute the
show controller t1 x
command
Is the line
administratively
down?
No
Yes
No
No
If your T1/E1 or T3/E3 controller still
does not function as desired,
contact your service/network provider
Is the line up?
Is the line in
loopback mode?
Are there any
alarms?
Are there
any error
Use the following commands to
bring up the controller:
controller t1 x
no shutdown
Loss of Signal/Loss of Frame
Use the following commands to
turn loopback off:
controller t1 x
no loopback (T1/E1)
Alarm analysis
Error Events analysis
No
Yes
Yes
Yes
Yes
- refer to Figure 5
- refer to Figures 6 and 7
- refer to Figure 8
events?