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10-12
Installation and Maintenance
V
olume
Octel Overture 200/300 Serenade 3.0
PB60014–01
DS1A
Signal Status — state of entire trunk
Field
Possible values
Description
RECEIVE
State In
frame
Out of frame
Loss of Signal
Normal.
Functioning but has problems.
Not functioning.
RAI (Remote Alarm
Indication)
OFF
ON
Remote end receiving signal and detects no
problems.
Remote end detects problems with signal from
DTIC.
AIS (Alarm Indication
Signal)
OFF
ON
Normal.
Problem with far end sending pattern, cannot
make phone calls.
Line Code:
AMI (Alternate Mark
Inversion)
HDB3 (High Density
Bipolar with 3 bits)
???
Normal.
HDB3 mode is enabled. HDB3 pattern being
sent.
Loss of signal. The question marks (???) appear
in the field.
Excess CRC Failure
(Cyclic Redundancy
Check)
NO
Number of excess
failures
If the mode is not CRC4 (the mode used in
Europe).
The signal for the check is sent 1,000
times/second. When the check fails more than
about 888 times/second, the digit is incremented.
Excess F
AS Errors
(Frame Alignment Signal)
NO
YES
In checking for F
AS errors, a signal with a
repetitive pattern is sent by the far end at 8,000
times/second. If the DTIC does not receive an
expected item from the pattern several times in a
row
, the field changes to YES.
Excess FEBE
(Far End Block Error)
NO
YES
Signal from DTIC is okay
.
Signal from DTIC has problems.
This field applies only for CRC mode.
TRANSMIT
Traffic Disabled
Enabled
DTIC not able to actively place phone calls. The
card is not usable.
The signal that the DTIC is receiving is not
satisfactory.
RAI (Remote Alarm
Indication)
OFF
ON
Near end receiving signal and detects no
problems.
Near end detects problems with signal from
PBX.
AIS (Alarm Indication
Signal)
OFF
ON
Normal.
Near end initializing, cannot make phone calls.
Mode CRC4
Non-CRC4
The network is using this advanced error
checking.
The network is not using CRC4.
Loopback OFF
ON
Special looping diagnostics are being run.
Normal operation — not looping.