TSW200E1
E1/G.704– the counter is incremented whenever there is one (or more) errors in
the FAS word.
X.50 - the counter is incremented whenever any bit in the FAS word is wrong.
The maintenance bits are not included.
•
CRC ERROR: The counter is incremented whenever one or more errors are detected on
the CRC word.
•
CODE ERR.: The detection of this error depends of the used line code:
HDB3 – there is a code error when the violation comes with the same polarity of
the preceding violation or when a violation does not come preceded by two
zeros;
AMI – a code error occurs when the pulse comes with the same polarity of the
preceding pulse (bipolar violation).
•
E-BIT: This counter is incremented each time that bit 7 of frames 13 or 15 of G.704
multiframe are set to zero by the remote device, indicating that the remote device
detected CRC error.
•
SLIP: The SLIP alarm is set if SLIP is detected in the pseudo-random sequences.
•
SIGNAL LOSS: This counter is incremented whenever 255 consecutive bits are 0.
•
NO CLOCK: This counter is incremented if a there occurs a period of more than 125 s
with no clock.
•
AIS:
E1/G.704– it is generated whenever 512 bits or 2 consecutive frames have all
bits equal to 1 in the 2 Mbps frames.
X.50 – it is generated whenever 504 consecutive bits are 1 in the 2 Mbps frames.
•
FAS LOSS
E1/G.704- Counter that indicates FAS sync loss. The counter is incremented
whenever there are three consecutive FAS words with error or if bit 2 of the odd
frames is received with error for three consecutive times.
X.50 - This counter is incremented whenever the FAS error remains active for
more than 10 ms.
•
CAS LOSS: Counter that indicates multiframe sync loss. In the 2Mbps G.704 analysis,
when two consecutive MFAS words are in error or when many ABCD words are equal
to 0000, the equipment is not capable of identifying the MFAS (0000) and it flags a CAS
sync loss. So, it is necessary to set at least a bit of each ABCD word for channels 1 to 15.
•
CRC LOSS: Counter that indicates CRC sync loss. This counter is incremented every
time that, for a thousand CRC words, there are 915 or more in error.
•
PAT LOSS:
In the Asynchronous Mode this counter is incremented once a second whenever
there are more than 10% of errors in a 1024-bit block.
For the other modes this counter is incremented once a second if there are more
than 6.25% of errors in a 1024-bit block.
•
REMOTE ALARM:
E1/G.704- the counter is incremented whenever bit 3 (A) of the NFAS word is
set for three consecutive times.
X.50 - the counter is incremented whenever bit A of the FAS sequence indicates
an alarm.
•
RMF ALARM: In the 2Mbps G.704 analysis, the counter is incremented whenever bit 6
of timeslot 16 is set for two consecutive times.
Wise Telecommunications Industry
20
Summary of Contents for TSW200E1
Page 1: ...Operation Manual TSW200E1 Version 1 Revision 7 November 2010 ...
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