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NOTE: The BERT patterns supported when testing the T1 layer vary depending on
the line module and I/O module assembly you are using.
t1 loopback
NOTE: The CT3/T3-F0 line module does not support the remote line inband option.
2^20-QRSS Pseudorandom QRSS test pattern, 1,048,575 bits in length
2^23 Pseudorandom test pattern, 8,388,607 bits in length
alt-0-1 Repetitive alternating test pattern of zeros and ones, 01010101...
Specify the duration of the test in the range 1–1440 minutes.
Optionally, specify the unframed keyword to overwrite the framing bits.
Example
host1(config-controll)#t1 2 bert pattern 2^11 interval 10 unframed
Use the no version to stop the test that is running.
See t1 bert.
Use to configure a loopback.
Specify one of the following options:
local Loops the router output data back toward the router at the T1 framer;
on supported line modules, also sends an alarm indication signal (AIS) out
toward the network
network { line | payload } Specify the line keyword to loop the data back
toward the network before the T1 framer and automatically set a local
loopback at the HDLC controllers. Specify the payload keyword to loop the
payload data back toward the network at the T1 framer and automatically
set a local loopback at the HDLC controllers.
remote line fdl ansi Sends a repeating 16-bit ESF data link code word
(00001110 11111111) to the remote end requesting that it enter into a
network line loopback. Specify the ansi keyword to enable the remote line
facilities data link (FDL) ANSI bit loopback on the T1 channel, according to
the ANSI T1.403 Specification.
remote line fdl bellcore Sends a repeating 16-bit ESF data link code word
(00010010 11111111) to the remote end requesting that it enter into a
network line loopback. Specify the bellcore keyword to enable the remote
line facilities data link (FDL) Bellcore bit loopback on the T1 channel, per the
Bellcore TR-TSY-000312 Specification.
Chapter 1: Configuring Channelized T3 Interfaces
Testing Interfaces
27
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