1-61
General Information
Specifications
AlarmScan plus alarm and BIP scan:
Automatically scans the SONET
network hierarchy for alarms and BIP
errors or alarms only with a graphical
display of the network hierarchy's
status including the indication of
unequipped channels. Alarms: LOP,
path AIS, RDI-P, H4 LOM†, VT LOP*,
AIS-V*, RDI-V.*
† For VT6, VT2 AND VT1.5 structures.
* If applicable.
BIP errors:
STS-3c SPE payloads: STS-3c SPE
CV-P (B3).
STS-1 SPE payloads: STS-1 SPE CV-P
(B3).
VT6 /VT2 /VT1.5 payloads: STS-3c
SPE/STS-1 SPE B3 and CV-V (V5).
User selectable BIP error threshold:
Off, > 0, > 10-3, > 10-6.
Protection switch times: Service
disruption test measures error burst
length for measurement of protection
switch times†. Accuracy: < 50 ms.
Results: Longest burst length, shortest
burst length, last burst length.
Resolution: 1 ms.
† Service disruption test requires PDH/
DSn option UKJ, UKN or 110 to be
fitted.
Pointer results: STS Path pointer
value, NDF-P seconds, STS Path
missing pointer, NDF seconds, STS
Path +ve adjustment count/seconds,
STS Path -ve adjustment count/
seconds, VT pointer value, NDF-V
seconds, VT pointer missing NDF -V
seconds, VT +ve adjustment count/
seconds, VT -ve adjustment count/
seconds, implied STS-3c SPE, STS-1
SPE, VT6 SPE, VT2 SPE offset.
Frequency measurement: Frequency
displayed in Hz, 1 Hz resolution. Offset
displayed in ppm and Hz.
Received overhead snapshot:
TOH can be set in binary or HEX. TOH
and POH of a received STM-1 signal.
TOH and POH of a received STS-1
signal. Text message displayed for
signal label (C2 and V5) and sync
status (S1) decoded.
Overhead sequence capture:
Any one overhead channel is selected.
After a manual or programmed trigger,
the captured byte values are displayed
together with the number of
consecutive frames containing the
value.
Pointer location graph: A graphical
display that shows the variation with
time of the STS Path and VT pointer
location. Up to four days of pointer
location activity can be monitored.
Implied SPE offset: The total positive
and negative pointer movements since
the start of the measurement period are
summed and the implied mean SPE
offset calculated from this total.
Overhead BER measurement: Any
SOH, LOH or POH (except A1, A2,
H1, H2, Z1, Z2) channel is selected and
a BER measurement is performed using
a 2
9
-1 PRBS inserted into a 64 kb/s
channel. Single errors can be added to
the test pattern. Error count, error ratio,
error free seconds, % error free seconds
and pattern loss seconds are measured.
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