3com MSR 20-20 참조 매뉴얼

# Enable periodical alarm signal detection on T1 line 1 on CT3 interface T3 2/0.

<Sysname> system-view

[Sysname] interface t3 2/0

[Sysname-T3 2/0] t1 1 alarm detect 

# Enable T1 line 1 on CT3 interface T3 2/0 to send AIS alarm signals.

<Sysname> system-view

[Sysname] interface t3 2/0

[Sysname-T3 2/0] t1 1 alarm generate ais 

t1 line-number bert pattern { 2^11 | 2^15 | 2^20 | 2^23 | qrss } time number 
[ unframed ]

undo t1 line-number bert

CT3 interface view

line-number: T1 line number, in the range 1 to 28.

pattern: Sets a BERT pattern, which could be 2^11, 2^15, 2^20, 2^23, or QRSS.

2^11: Two to the 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.

2^20: Two to the twentieth power, length of the transmitted BERT pattern in bits.

2^23: Two to the twenty third 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 or more consecutive zeros is not allowed.

time number: Sets the duration of a BERT test, in the range of 1 to 1440 minutes.

unframed: Sets the test pattern to cover the overhead bits of the frame.

Use the t1 bert command to start a BERT test on the specified T1 line on the CT3 
interface.

Use the undo t1 bert command to stop the BERT test running on the specified 
T1 line on the CT3 interface.

ITU O.151, ITU O.153, and ANSI T1.403-1999 define many BERT patterns, among 
which, T1 lines on CT3 interfaces support only 2^11, 2^15, 2^20, 2^23, 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