250
C
HAPTER
15: T1-F I
NTERFACE
C
ONFIGURATION
C
OMMANDS
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-1
keyword 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-2
keyword 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-1
keyword specifies to generate an LFA alarm when two of four
frame alignment bits are lost.
■
The
level-2
keyword specifies to generate an LFA alarm when two of five
frame alignment bits are lost.
■
The
level-3
keyword specifies to generate an LFA alarm when two of six frame
alignment bits are lost.
■
The
level-4
keyword 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-threshold
command to set LOS, AIS, or LFA alarm thresholds
on the T1-F interface.
Содержание MSR 20-20
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