Network Device Installation and User's Guide

3-2 9/24/01
3.2 Dual T1 Network Line Interfaces
3.2.1 Total Bandwidth
• 3.072 Mbps
3.2.2 DS-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)
3.3 Line Codes
• AMI or B8ZS and line code conversions between T1 lines
3.4 Framing
• D4 (Superframe) or ESF and framing format conversions between T1 lines
3.5 Clock Source
• Loop Timing: Selectively recovered from incoming T1 Span 1 or Span 2
• Master Clock: Internal Enhanced Stratum 4E Crystal Oscillator ±32 ppm accuracy)
3.6 T1-to-T1 Delay
• Latency: 3 frames maximum (0.375 ms)
3.7 T1 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)