Selecting A Bert Pattern For A Channel - Nortel Versalar 15000 Troubleshooting Manual

Managing and Troubleshooting the Versalar Switch Router 15000
• Starting or Stopping BERT on a Channel
• Resetting Local BERT Counters for a Channel
• Viewing BERT Results

Selecting a BERT Pattern for a Channel

When a T1 test or logical line test is in BERT mode, the DS1 compares a
particular error pattern to the one introduced into the transmitted bit stream. The
pattern can be all ones, all zeros, or a quasi-random signal sequence (QRSS)
pattern. By default, the test pattern is all 1s.
To change a BERT pattern, go to the logical line test or T1 test prompt
(for example,
following command:
bert-test-pattern < option >
option
•
ones
•
zeros
•
two15
• two15-inv
•
two20
•
two23
• two23-inv
•
qrss
The following example shows how to generate a random BERT pattern of 2
on slot 2, connector 1, T1 channel 4:
t1-test/t1-2/1/4#
t1-test/t1-2/1/4#
6-14
logical-line-test/ft1/2/1/5/6
is one of the following patterns:
indicates all ones. This is the default pattern.
indicates all zeros.
indicates a random pattern of 32,767 or 2
indicates an inverted random pattern of 32,767 or 2
specifies a random pattern of 1,048,575 or 2
specifies a random BERT pattern of 8,388,607 or 2
indicates an inverted random BERT pattern of 8,388,607 or 2
indicates a quasi-random signal sequence (QRSS).
bert-test-pattern two23
or ) and enter the
t1-test/t1-2/1/4
15 bits.
bits.
20
23
15 bits.
bits.
23 bits.
23 bits
302768-C Rev 00