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Field
RECEIVE
State
RAI (Remote Alarm
Indication)
AIS (Alarm Indication
Signal)
Line Code:
Excess CRC Failure
(Cyclic Redundancy
Check)
Excess FAS Errors
(Frame Alignment Signal)
Excess FEBE
(Far End Block Error)
TRANSMIT
Traffic
RAI (Remote Alarm
Indication)
AIS (Alarm Indication
Signal)
Mode
Loopback
PB60019−01
DS1A Signal Status — State of Entire Trunk
Possible values
In frame
Out of frame
Loss of Signal
OFF
ON
OFF
ON
AMI (Alternate Mark
Inversion)
HDB3 (High Density
Bipolar with 3 bits)
???
NO
Number of excess
failures
NO
YES
NO
YES
Disabled
Enabled
OFF
ON
OFF
ON
CRC4
Non-CRC4
OFF
ON
Description
Normal.
Functioning but has problems.
Not functioning.
Remote end receiving signal and detects no
problems.
Remote end detects problems with signal from
DTIC.
Normal.
Problem with far end sending pattern, cannot
make phone calls.
Normal.
HDB3 mode is enabled. HDB3 pattern being
sent.
Loss of signal. The question marks (???) appear
in the field.
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.
In checking for FAS 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.
Signal from DTIC is okay.
Signal from DTIC has problems.
This field applies only for CRC mode.
DTIC not able to actively place phone calls. The
card is not usable.
The signal that the DTIC is receiving is not
satisfactory.
Near end receiving signal and detects no
problems.
Near end detects problems with signal from
PBX.
Normal.
Near end initializing, cannot make phone calls.
The network is using this advanced error
checking.
The network is not using CRC4.
Special looping diagnostics are being run.
Normal operation − not looping.
DTIC
10-11
Octel 200/300
S.4.1
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