Specifications
S-3
ANT-20/ANT-20E
PDH MUX/DEMUX
1.4
Error insertion (anomalies)
In addition to the error types described in the “Specifications” for the mainframe instrument, the
following anomalies can be inserted:
The insertion of errors (anomalies) or alarms (defects) are mutually exclusive. The action
selected first is active.
1.5
Alarm generation (defects)
The alarm types are described in the “Specifications” for the mainframe instrument.
The insertion of alarms (defects) or errors (anomalies) are mutually exclusive. The action
selected first is active.
1.6
Test signals for bit error rate measurements
1.6.1
Internal test signals
Bit patterns as in the mainframe instrument:
1.6.2
External signal (with option 3035/90.20 only)
An external signal with bit rate 34 368 kbit/s (coaxial), 8 448 kbit/s (coaxial) or 2 048 kbit/s
(coaxial or balanced) can be inserted into the selected timeslot instead of the bit pattern
(see Sec. 1.6.1).
The interfaces for this signal are described in the “Specifications” for the STM-1 mapping
options.
1.6.3
Filler signals
Complete structured signals using the pseudo-random bit sequence PRBS 6 are transmitted in
all timeslots except the selected timeslot in all 64 kbit/s channels.
Error type, anomaly
1
Single
Rate
2
CRC-4
yes
2E-3 to 1E-8
E bit
yes
2E-3 to 1E-8
1 For PCM 30 CRC and PCM 31 CRC only
2 A CRC word error rate is inserted
Table S-3
Available error types (anomalies) in addition to the mainframe instrument
•
Transmitted
in all timeslots (framed pattern to ITU-T O.150/O.151)
•
Transmitted
in a selected timeslot
