3Com MSR 30 Bert CT1/PRI interface view, Bert pattern 215 220 time minutes unframed, Undo bert

214CHAPTER 13: FUNDAMENTAL CT1/PRI INTERFACE CONFIGURATION COMMANDS

If the number of the pulses detected during the total length of the specified pulse detection intervals is smaller than the pulse-recovery threshold, a LOS alarm occurs. For example, if the two thresholds take their defaults, a LOS alarm is created if the number of pulses detected within 176 pulse intervals is less than 22.

Description Use the alarm-thresholdcommand to set LOS, AIS, or LFA alarm thresholds on the CT1/PRI interface.

Use the undo alarm-thresholdcommand to restore the defaults.

Example # Set the number of detection intervals to 300 for the pulse detection duration threshold.

<Sysname> system-view [Sysname] controller t1 2/0

[Sysname-T1 2/0] alarm-threshold los pulse-detection 300

bert (CT1/PRI interface view)

Syntax	bert pattern { 2^15 2^20 } time minutes [ unframed ]
	undo bert
View	CT1/PRI interface view
Parameter	pattern: Sets a bit error rate test (BERT) pattern, which could be 2^15 or 2^20.
	2^15: Two to the fifteenth power, length of transmitted BERT pattern in bits.
	2^20: Two to the twentieth power, length of transmitted BERT pattern in bits.
	time minutes: Sets the duration (in minutes) of a BERT test. The minutes argument
	ranges from 1 to 1,440.
	unframed: Sets the test pattern to cover the overhead bits of the frame.
Description	Use the bert command to start a BERT test on a CT1/PRI interface.
	Use the undo bert command to stop the BERT test running on the CT1/PRI
	interface.
	ITU O.151, ITU O.153, and ANSI T1.403-1999 define many BERT patterns, among
	which, the CT1/PRI interface supports only 2^15 and 2^20 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 received pattern for bit error rate, and by so doing helps you identify
	the condition of the line. To this end, you must configure loopback to allow the
	transmitted pattern to loop back from somewhere on the line, for example, from
	the far-end interface by placing the interface in a far-end loopback.