Cisco 10000 Series Configuration Manual page 235

Chapter 8 6-Port Channelized T3 Line Card Configuration
Note
The 6-Port Channelized T3 line card sends the following code for remote line fdl ANSI loopback:
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The 6-Port Channelized T3 line card sends the following code for remote line FDL Bellcore
(SmartJack) loopback:
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–
remote line inband sends a repeating inband pattern to the remote end, requesting entry into a
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network line loopback. The inband loopback request overwrites all data in the T1 with the loop
request pattern. The remote end responds to this code only after it receives the pattern continuously
for at least five seconds.
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• remote payload [fdl] [ansi] sends a repeating, 16-bit ESF data link code word to the remote end,
requesting entry into a network payload loopback. Using fdl and ansi enables the remote payload
facility data link (FDL) ANSI bit loopback on the T1 channel.
Note
The 6-Port Channelized T3 line card sends the following code for remote payload fdl ANSI
loopback:
–
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Use the no form of the command to terminate a loopback.
For more information on this command, refer to the online
Troubleshooting
Examples:
Configure the T3 controller for local loopback on T1 interface 1.
•
Router(config)# controller t3 1/0/0
Router(config-controller)# t1 1 loopback local
Configure the T3 controller for remote FDL ANSI loopback on T1 interface 1.
•
Router(config)# controller t3 1/0/0
Router(config-controller)# t1 1 loopback remote line fdl ansi
OL-8834-04
Loopback codes are defined in ANSI T1.404-1989 Table 3 (Assigned Bit-Oriented ESF
Data-Link Messages)
Line Loopback Active Code: 0 000111 01111111
Line Loopback Deactivate Code: 0 010010 01111111
Network Use (loopback active) Code: 0 001001 01111111
Network Use (loopback deactivate) Code: 0 010010 01111111
Repeating Inband Loopback Activate Code: 00001
Repeating Inband Loopback Deactivate Code: 001
Loopback codes are defined in ANSI T1.404-1989 Table 3 (Assigned Bit-Oriented ESF
Data-Link Messages)
Payload Loopback Active Code: 0 001010 011111111
Payload Loopback Deactivate Code: 0 011001 011111111
Guide.
Cisco 10000 Series Internet Router
Cisco 10000 Series Router Line Card Configuaration Guide
Channelized T1 Commands
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