Information Technology Reference
In-Depth Information
If Receiver Has Loss of Frame
Check to see whether the framing format configured on the port matches the framing format of the line.
You can check the framing format of the controller from the running configuration or the
show
controller e1
command output.
To change the framing format, use the
framing {CRC4 | no CRC4
} command in the controller
configuration mode, as shown here:
Step 1
maui-nas-03#
configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
maui-nas-03(config)#
controller E1 0
maui-nas-03(config-controlle)#
framing CRC4
Try the other framing format to see if the alarm clears.
If this does not fix the problem, proceed to the receiver has loss of signal section below.
Step 2
Check the framing format on the remote end.
Step 3
Check the linecoding on the remote end.
Step 4
If Receiver Has Loss of Signal
Step 1
Make sure that the cable between the interface port and the E1 service provider's equipment or E1
terminal equipment is connected correctly. Check to see whether the cable is hooked up to the correct
ports. Correct the cable connections if necessary.
Step 2
Check cable integrity. Look for breaks or other physical abnormalities in the cable. Ensure that the
pinouts are set correctly. If necessary, replace the cable.
Step 3
Check the cable connectors. A reversal of the transmit and receive pairs or an open receive pair can cause
errors. Set the receive pair to lines 1 and 2; the transmit pair should be lines 4 and 5.
The pins on a RJ-48 jack are numbered from 1 through 8. Pin 1 is the leftmost pin when looking at the
jack with the metal pins facing you. Refer to Figure 15-12 for more information.
Figure15-12RJ-45 Cable
87654321
RJ-45 connector
Step 4
Try using a rollover cable.
Step 5
Check to see whether there are far-end block errors. If so, the problem exists with the receive lead on the
local end. Contact TAC for more assistance.
Run the
show controller e1
exec command after each step to check whether the controller exhibits any
errors.
