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Errored Seconds − the number of seconds for which at least one bit error has
ES
occurred. A default threshold for alarm of 45 counts has been set for this
parameter.
Severely Errored Seconds − the number of seconds for which bursts of errors
SES
have occurred during the last 15 minutes. Often the noise on the E1 link is of
an impulsive random nature. The impulse noise tends to cause several bit
errors in sequence. The line then may become quiet and error-free for most of
the time. This parameter gives a measure of the impulsive error quality of the
line. The threshold for SES is set at 5.
Loss Of Signal Seconds − the number of seconds for which the receiver failed
LOSS
to see received signal strength above its lower operating limit. The default
alarm threshold for this condition is set at 5.
Out Of Frame Seconds − the number of 1-second periods in which a frame
OOFS
sync loss occurred. Often the receiver will be able to bridge bit errors and still
maintain frame synchronization. This is true since a frame consists of many
bits. The default alarm threshold for this condition is set at 5.
Bipolar Violation Seconds − the number of times the signal failed to observe
BPVS
the rules for changing the polarity of the logic "1" transmitted signal. The
default alarm threshold for this condition is set at 0, which means this alarm
is initially turned off.
Controlled Slip Seconds − indicates the number of seconds during which a
CSS
timing correction was needed due to buffer under-run or overflow. The default
alarm threshold for this condition is set at 5.
Remote Alarm Seconds − the number of seconds the RAI/yellow alarm has
RAS
been reported from the remote end of the E1 link. The default alarm threshold
for this condition is set at 0, which means this alarm is initially turned off.
Alarm Indication Signal Seconds − the number of seconds AIS has been
AISS
received. The default alarm threshold for this condition is set at 0, which
means this alarm is initially turned off.
Unavailable Seconds − the number of seconds for which data was not
UAS
available at the E1 port. The default alarm threshold for this condition is set at
0, which means this alarm is initially off.
NOTICE:
Alarm detection and generation are per the guidelines set forth in ITU-
T G.703 and G.704.
DTR Alarm
Read-only field that displays the current DTR Alarm status. This register
shows "OK" when no alarms are detected, and shows "ALRMED" when the
F r o n t P a n e l L C D I n t e r f a c e
5-7
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