Manually Selecting The Reference; Detecting Input Errors - Symmetricom TSG-3800 Series User Manual

Manually Selecting the Reference

To select a channel as the input reference:
1. Connect to the TSG-3800 and described in
2. Ensure that AUTORETURN is off, This prevents the TSG-3800 from
automatically switching back to a higher priority input channel. (To check the
autoreturn state, type
3. Type
REFERENCE «input»
selected Input module illuminates.
Example
Purpose: Select the secondary input as reference.
Command:
REFERENCE INP2.1
Display:
->REFERENCE INP2.1
«date» «time» «oper» set Input Reference to «input», was
«input»
+>

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
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 for
clearing the fault
Reset the fault and clear counts
12778474-002-2 Revision F – March 2004
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Logging
and press Enter.)
INPUT AR
and press Enter. Note that the REF indicator on the
Chapter 5, Input Modules.
Operating the TSG-3800
Setting Up Input Reference Controls
In, on page 81.
TSG-3800 User's Guide 89