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Usage guidelines
Multiple BERT test modes exist, as defined in ITU O.151, ITU O.153, and ANSI T1.403- 1 999. 2^1 1, 2^15,
2^20, 2^23, and QRSS are available on E1 channels created on CE3 interfaces.
To perform a BERT test, the local end transmits test data stream, which is returned after reaching specific
nodes. The local end then checks for the bit error rate by comparing the returned data stream with the
original, through which the state of the link can be determined. BERT test requires that data stream can
be looped back on specific nodes. You can achieve this by enabling remote loop back on the peer.
You can use the bert command to set the test mode and the test duration. During the process of a BERT
test, you can check the state and the result of the test. For more information, see the command that
displays information about a CE3 interface.
Examples
# Perform BERT test in QRSS mode on E1 channel 1 created on CE3 2/0/0 interface, setting the duration
to ten minutes.
<Sysname> system-view
[Sysname] interface e3 2/0/0
[Sysname-E3 2/0/0] e1 1 bert pattern qrss time 10

e1 channel-set

Use e1 channel-set to bundle timeslots on an E1 line.
Use undo e1 channel-set to remove a timeslot bundle.
Syntax
e1 line-number channel-set set-number timeslot-list list
undo e1 line-number channel-set set-number
Default
No timeslots are bundled into channel sets.
Views
CE3 interface view
Default command level
2: System level
Parameters
line-number: E1 line number in the range of 1 to 16.
set-number: Number of the channel set formed by a timeslot bundle on the E1 line. It ranges from 0 to 30.
timeslot-list list: Specifies the timeslots to be bundled. The list argument can contain multiple timeslot
numbers, each of which ranges from 1 to 31. You can specify a single timeslot by specifying a timeslot
number, a range of timeslots by providing this argument in the form of { number1-number2 }, or multiple
timeslots by providing this argument in the form of { number1, number2-number3 }.
Usage guidelines
A CE3 interface can be channelized into 64 kbps lines and the timeslots on each E1 line can be bundled
into up to 31 channels.
153

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