Detecting Input Errors - Symmetricom TSG-3800 Series User Manual

System Administrator's Reference
Provisioning Input Reference Signals
>TSG->
Ref is using SSM Mode
TSG->
To set the Reference Selection mode, use the following command:
REF MODE [PRI|SSM|BEST]
For more information, refer to

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.
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.
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
Note: Fault limits and modes are independent for each Input module
and may be set to different values.
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]
A typical response of the TSG-3800 is:
330 TSG-3800 User's Guide
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REF MODE
and press Enter.
Reference Command, on page 354.
then press Enter
12778474-002-2 Revision F – March 2004