Information Technology Reference
In-Depth Information
Performing the Loopback Plug Test
Insert the plug into the T1 port in question.
Step 1
Save your router configuration using the write memory command.
Step 2
maui-nas-03# write memory
Building configuration...
[OK]
Set the encapsulation to HDLC.
Step 3
maui-nas-03# config terminal
Enter configuration commands, one per line. End with CNTL/Z.
maui-nas-03(config)# interface serial 0
maui-nas-03(config-if)# enc
maui-nas-03(config-if)# encapsulation HDLC
maui-nas-03(config-if)# ^Z
Use the show running-config command to check whether the interface has an IP address.
If the interface does not have an IP address, obtain a unique address and assign it to the interface with a
subnet mask of 255.255.255.0
Step 4
maui-nas-03(config)# ip address 172.22.53.1 255.255.255.0
Clear the interface counters using the clear counters command.
Step 5
maui-nas-03# clear counters
Clear “show interface” counters on all interfaces [confirm]
maui-nas-03#
Perform the extended ping test as described in the “Using Extended ping Tests” section, earlier in this
chapter.
Step 6
Troubleshooting E1 Problems
This section describes the techniques and procedures to troubleshoot E1 circuits for dial-in customers.
Troubleshooting Using the show controller e1 Command
The show e1 controller exec command provides information to logically troubleshoot physical layer and
data link layer problems. This section describes how to logically troubleshoot using the show controller
e1 command.
This command displays the controller status that is specific to the controller hardware. The information
displayed is generally useful for diagnostic tasks performed by technical support personnel only.
The NPM or MIP can query the port adapters to determine their current status. Issue a show controller
e1 command to display statistics about the E1 link.
If you specify a slot and port number, statistics for each 15-minute period will be displayed.
Most E1 errors are caused by misconfigured lines. Ensure that linecoding, framing, clock source, and
line termination (balanced or unbalanced) are configured according to what the service provider
recommended.
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