Carrier Access SNMP manual Dual T1 Network Line Interfaces, Line Codes, Framing, Clock Source

3.2 Dual T1 Network Line Interfaces

3.2.1Total Bandwidth

•3.072 Mbps

3.2.2DS-1 Output Signals

•Pulse amplitude: 2.0 V to 3.6 V ±60 Hz variations

•Line Rate: 1.544 Mbps ±50 bps

•Format: T1 type bipolar (except where intentional BPVs are introduced by B8ZS line coding)

3.3Line Codes

•AMI or B8ZS and line code conversions between T1 lines

3.4Framing

•D4 (Superframe) or ESF and framing format conversions between T1 lines

3.5Clock Source

•Loop Timing: Selectively recovered from incoming T1 Span 1 or Span 2

•Master Clock: Internal Enhanced Stratum 4E Crystal Oscillator ±32 ppm accuracy)

3.6T1-to-T1 Delay

•Latency: 3 frames maximum (0.375 ms)

3.7T1 Channel Service Units (CSUs)

•Integrated intelligent CSUs support all standard diagnostic functions and DS-1 or DSX-1 signal levels from 0 to -30 dB

•Software programmable Line Build Out (LBO): 0 dB/DSX (0’-133’) (default), -7.5 dB, - 15 dB, -22.5 dB, DSX (133’-266’), DSX (266’-399’), DSX (399’-533’), DSX (533’- 655’)

•AT&T 54016 Maintenance Messages or T1.403 Performance Report Messages (PRMs) through 4 Kbps ESF Facility Data Link (FDL)

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