Command Reference Guide

3Com Router 5000 Family and Router 6000 Family bert (CT3 Interface) ● 21
Command Reference
bert (CT3 Interface)
Purpose Use the bert command to start a BERT test on the CT3 interface.
Use the undo bert command to stop the BERT test running on the CT3 interface.
Syntax bert pattern { 2^7 | 2^11 | 2^15 | qrss } time number [ unframed ]
undo bert
Parameters pattern
Sets a bit error rate test (BERT) pattern, which could be
2^7, 2^11, 2^15, or QRSS.
2^7
Two to the seventh power, length of the transmitted
BERT pattern in bits.
2^11
Two to eleventh power, length of the transmitted BERT
pattern in bits.
2^15
Two to the fifteenth power, length of the transmitted
BERT pattern in bits.
qrss
Two to the twentieth power, length of the transmitted
BERT pattern in bits. In this pattern, the presence of 14
consecutive zeros is not allowed.
time number
Sets the duration of a BERT test, in the range of 1 to
1440 minutes.
unframed
The test pattern covers the overhead bits of the frame.
Example Run a 10-minute QRSS BERT test on CT3 interface 1/0/0.
<3Com > system-view
[3Com ] interface t3 1/0/0
[3Com -T3 1/0/0] bert pattern qrss time 10
Stop the BERT test running on CT3 interface 1/0/0.
<3Com > system-view
[3Com ] interface t3 1/0/0
[3Com -T3 1/0/0] undo bert
View This command can be used in the following views:
■ CT3 Interface view
Description ITU O.151, ITU O.153, and ANSI T1.403-1999 define many BERT patterns, among
which, the CT3 interface supports only 2^7, 2^11, 2^15, and QRSS at present.
When running a BERT test, the local end sends out a pattern, which is to be looped
over somewhere on the line and back to the local end. The local end then checks the