Nortel Enterprise 1000 Reference Manual page 233

Table 65
NT8D09 Analog Message Waiting Line Card technical summary
(Part 2 of 2)
Ringing voltage
Signaling
Supervision
Power input from
backplane
Insertion loss
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Analog line cards
86 V ac
Loop start
Normal battery conditions are continuously
applied (approximately –44.5 V on ring and
–2.5 V on tip at nominal –48 V battery)
–48 (can be as low as –42 for dc-powered
systems), +15, –15, +8.5 V and ringing
voltage; also –150 V on analog message
waiting line card.
6 dB + 1 dB at 1020 Hz
3.5 dB loss for analog to PCM,
2.5 dB loss for PCM to analog
Page 233 of 236