
System Administrator’s Reference
Provisioning Input Reference Signals
330
TSG-3800 User’s Guide
12778474-002-2 Revision F – March 2004
>TSG->
REF MODE
Ref is using SSM Mode
TSG->
To set the Reference Selection mode, use the following command:
REF MODE [PRI|SSM|BEST]
and press
Enter
.
For more information, refer to
Reference Command
, on page 354.
Detecting Input Errors
The TSG-3800 checks the incoming reference signals for eight types of signal
faults. The faults are: AIS (alarm indication signal), BPV (bipolar violation), CRC
(cyclic redundancy check), LOS (loss of signal), and OOF (out of frame), SSM
(Synchronization Status Message), MTIE (Maximum Time Interval Error) Limits, and
Frequency Limits.
For each input fault, you may:
Assign a fault mode
Specify a timer limit for each fault
The timer limit is the number of 1-second time intervals containing one or more
errors, within the last hour
Specify the number of consecutive error-free 1-second intervals required to clear
the fault
Reset the fault and clear counts
Displaying Input Signal Fault Limits
To display the Input Signal fault mode assignment, error count, and clear count,
type:
INPUT [LOS|CRC|AIS|BPV|OOF]
then press
Enter
A typical response of the TSG-3800 is:
Note:
These faults are not characteristics for all types of input
signals; for example, a sinusoidal input does not contain BPVs. Refer
to the appropriate module section for applicable input faults.
Note:
Fault limits and modes are independent for each Input module
and may be set to different values.
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