User`s guide

60 XSR User’s Guide
Troubleshooting T1/E1 Links Chapter 4
Configuring T1/E1 Interfaces
T1/E1 Error Events Analysis
This section describes various error events that can occur on T1/E1 lines and
provides troubleshooting information to fix some of these errors. The
show
controller command displays the status and statistics specific to the
hardware. This information is useful for diagnostic tasks.
All problems that can occur are captured by the underlying hardware and
reported by the
show controller output. Here are some troubleshooting
steps you can perform with a flowchart displaying troubleshooting actions.
Figure 8 T1/E1 Error Events Analysis Troubleshooting Flowchart
If your T1/E1 controller still
does not function as desired,
contact your service/network
Error Events Analysis
No
No
No
Yes
Is the slip seconds
counter increasing?
Is the framing loss
seconds counter
increasing?
Is the line code violations
counter increasing?
Is the clock source
derived from the
network/line?
Is the framing type
correct?
Is the line coding
correct?
Use the following
commands to set
framing:
controller t1 x
framing {SF | ESF}
IF T1, then change LBO:
cablelength {long | short}
Use the following
commands to set
line coding:
controller t1 x
linecode {ami | b8zs}
IF T1, then change LBO:
cablelength {long | short}
Use the command
below to verify the
error counter is still:
controller x
No
No
No
Yes
Yes
Use the following
commands to set
source clocking:
controller t1 x
clock source line
increasing:
Use the command
below to verify the
error counter is still:
controller x
increasing:
Use the command
below to verify the
error counter is still:
controller x
increasing:
provider