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ANT-20/ANT-20E
PDH MUX/DEMUX
i
Contents
Multiplex and demultiplex functions . . . . . . . . . . . . . . . . . . . . . . . . .I-1
Testing switch and sensor functions . . . . . . . . . . . . . . . . . . . . . . . . .I-2
In-service monitoring of tributary channels . . . . . . . . . . . . . . . . . . .I-2
Frame alignment signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1
Frame bit modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1
CRC checksum (PCM 30 CRC / PCM 31 CRC) . . . . . . . . . . S-2
Justification as per ITU-T G.742 and G.751 . . . . . . . . . . . . . S-2
PDH tributary offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-2
Error insertion (anomalies) . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
Alarm generation (defects) . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
Test signals for bit error rate measurements. . . . . . . . . . . . . S-3
Internal test signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
External signal (with option 3035/90.20 only) . . . . . . . . . . . . S-3
Filler signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
Frame systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-4
Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-4
Frame bit evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-4
CRC evaluations (PCM 30 CRC / PCM 31 CRC) . . . . . . . . . S-4
Offset measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-5
Error measurements (anomalies) . . . . . . . . . . . . . . . . . . . . . S-5
Alarm detection (defects) . . . . . . . . . . . . . . . . . . . . . . . . . . . S-5
Evaluation of test signals for bit error measurements . . . . . . S-5
Internal evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-5
External signal (with option 3035/90.20 only) . . . . . . . . . . . . S-5