Matrix Telecom SARVAM UMG System Manual page 690

Counter
Negative Slip Counter
Various Error Counters supported by the ISDN chip in T1 Mode are given in the table below.
Counter
Framing Alignment Bit
Error Counter
Out of Frame
Synchronization Error
Counter
CRC-6 Error Counter
Line Code Violation
Positive Slip Counter
Negative Slip Counter
You can view these Error Counters in the Jeeves for monitoring the performance of T1E1 Port.
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Matrix SARVAM UMG System Manual
This counter is incremented every time a negative slip occurs.
This counter is incremented on receipt of any error in the framing pattern.
In D4, Ft errors are counted. (Fs errors are counted if enabled)
In ESF, any error in the 001011 framing pattern increments this counter.
Out Of Frame (OOF) - Out of Frame is the occurrence of a particular density of
framing error events.
For D4 framing, OOF is declared when the receiver detects two or more
framing errors within 0.75 msec or two or more errors out of five or fewer
consecutive framing bits. It ends when there are fewer than two frame bit
errors within a 0.75 msec period.
For ESF framing, OOF is declared when the receiver detects two or more
framing errors within 3ms or two or more errors out of five or fewer consecutive
framing bits. It ends when there are fewer than two frame bit errors within a 3
msec period.
This counter is incremented when the received frame has CRC-6 errors. This
is applicable for ESF framing only.
This counter is incremented when a bipolar violation error occurs or when
excessive zeroes event occurs.
This counter is incremented every time a positive slip occurs.
This counter is incremented every time a negative slip occurs.
Meaning
Meaning
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