Alcatel Carrier Internetworking Solutions Omni Switch/Router User Manual
Page 1002
Viewing T1/E1 Configuration and Alarm Information
Page 33-14
Out of Frame Events
. The total number of out of frame events that have been detected on this
port. An out of frame event occurs when two or more framing errors occur within a 3 micro-
second period for Extended SuperFrame signals, or when two or more errors occur out of five
or fewer consecutive framing bits. The signal will be back in frame when there have been
fewer than two frame bit errors within a 3 microsecond period for Extended SuperFrame
signals.
Red Alarm Events
. The number of times this port has been in a red alarm state, which occurs
when a T1 port has been in Out-of-Frame (
OOF
) condition for 2.55 seconds. The red alarm
condition will be removed if the
OOF
condition has been absent for at least 16.6 seconds.
Squelch Alarm Events
. The number of squelch alarm events that have been detected on this
port. A squelch alarm occurs when the line signal level of the input pulse is below a thresh-
old level. The threshold level on a
T1
line is
0.5V
.
Frame Bit Error Events
. The number of framing bit error events that have been detected on this
port. A frame bit error occurs when an error bit is detected during the framing process.
Alarm Indication Signal Events
. The number of Alarm Indication Signal (
AIS
) events that have
been detected on this port. An
AIS
occurs when an unframed signal with a high density of 1s
(99.9% density) is received for more than 1.5 seconds.
Yellow Alarm Events
. The total number of yellow alarm events that have occurred on this
T1
port. A yellow alarm occurs in SuperFrames when bit 6 of all channels has been zero for at
least 335 microseconds. The yellow alarm will not occur if a Loss of Signal alarm has already
occurred. In Extended Superframes, an alarm occurs if the yellow alarm pattern is found.
Note
A T1 port that has been configured as a SuperFrame
(SF) port can produce false yellow alarms. You can
disable yellow alarm detection on a T1 port with the
temod
command, which is described in Configuring a
ESF CRC-6 Error Events
. The number of times a
CRC-6
error has been found in an Extended
SuperFrame.