Nortel Networks 1000 - Manual (Page 464)

464 NT8D09 Analog Message Waiting Line card
Technical summary or
Electrical specifications
Analog line interface
The NT8D09 Analog Message Waiting Line Card meets the EIA/TA464
standard for ONS Type II line cards.
Table 185 "Analog message waiting
line card - line interface unit electrical characteristics" (page 464) shows a
summary of the analog line interface unit electrical characteristics.
Table 185
Analog message waiting line card - line interface unit electrical
characteristics
Characteristics Description
Impedance 600 ohms
Loop limit
(excluding telephone) 1000 ohms at nominal –48 V
(excluding telephone)
Leakage resistance 30,000 ohms
Ring trip During silent or ringing intervals
Ringing voltage 86 V ac
Signaling Loop start
Supervision Normal battery conditions are continuously applied
(approximately –44.5 V on ring and –2.5 V on tip at
nominal –48 V battery)
Power input from
backplane –48 (can be as low as –42 for DC-powered
systems), +15, +8.5, –150 V and ringing voltage
Insertion loss 4 dB ±1 dB at 1020 Hz
3.5 dB loss for analog to PCM
0.5 dB loss for PCM to analog
Input impedance
The impedance at tip and ring is 600 ohms with a return loss of:
•
20 dB for 200-500 Hz
•
26 dB for 500-3400 Hz
Input impedance
The impedance at tip and ring is 600 ohms with a return loss of:
•
20 dB for 200-500 Hz
• 26 dB for 500-3400 Hz
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.