3Com MSR 30, MSR 50 manual Ft1 alarm-threshold, Undo ft1 alarm-threshold, On the T1-F interface

250CHAPTER 15: T1-F INTERFACE CONFIGURATION COMMANDS

ft1 alarm-threshold

Syntax	ft1 alarm-threshold { ais { level-1 level-2 } lfa { level-1 level-2 level-3 level-4 }
	los { pulse-detection pulse-recovery } value }
	undo ft1 alarm-threshold
View	T1-F interface view
Parameter	ais: Sets the alarm threshold of alarm indication signal (AIS), which can be level-1
	and level-2.
	■ The level-1keyword specifies to generate an AIS alarm when the number of 0s
	in the bit stream of an SF or ESF frame is less than or equal to 2.
	■ The level-2keyword specifies to generate an AIS alarm when the number of 0s
	is less than or equal to 3 in the bit stream of an SF frame or less than or equal
	to 5 in the bit stream of an ESP frame.
	By default, level-1 AIS alarm threshold applies.
	lfa: Sets the loss of frame align (LFA) alarm threshold, which can be level-1,
	level-2,level-3, and level-4.
	■ The level-1keyword specifies to generate an LFA alarm when two of four
	frame alignment bits are lost.
	■ The level-2keyword specifies to generate an LFA alarm when two of five
	frame alignment bits are lost.
	■ The level-3keyword specifies to generate an LFA alarm when two of six frame
	alignment bits are lost.
	■ The level-4keyword applies only to ESF frames. It specifies to generate an LFA
	alarm when errors are detected in four consecutive ESF frames.
	By default, level-1 LFA alarm threshold applies.
	los: Sets a loss of signal (LOS) alarm threshold, which can be pulse-detection(for
	the pulse detection duration threshold with LOS) and pulse-recovery(for the
	pulse threshold with LOS).
	The threshold of pulse-detection, in units of pulse intervals, ranges from 16 to
	4,096 and defaults to 176.
	The threshold of pulse-recovery, ranges from 1 to 256 and defaults to 22.
	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 ft1 alarm-thresholdcommand to set LOS, AIS, or LFA alarm thresholds
	on the T1-F interface.