8 Technical summary
Message channel noise-
The message channel noise C-weighted (dBmC) on 95% of the connections
(line to line) with both ends terminated in 600 ohms does not exceed 20
dEImC.
A technical summary of the line card is given in
Tible
3.
Table 3
Technical summary of Analog Message Waiting
Line Card
impedance: 6oQsz
Loop limit (excluding
set)
1000
Sz
at nominal -48 V
Leakage resistance
Ring trip
Ringing voltage
Signaling
Supervision
Power input from
shelf backplane
Insertion loss
Effective gain
30,ooo Q
During silent or ringing
intervals
86Vac
Loop start
Normal battery conditions are
continuously applied
(48
V on
ring; ground on tip)
-48, +15, -15, +8.5 V and
ringing voltage; also
-
150 V on
Message Waiting Line card.
6dB
+ldB
at 1020 Hz
3.5dB
loss for analog to PCM,
2.5dB
loss for PCM to analog
1.5dB at 1020
Hz
.-
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Analog message waiting line card description 553-3001-l 63