Summary 5
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
dBmC.
A technical summary of the Analog line
c&it
pack is’given in Table 3.
Table 3
Technical summary of Analog Line Card
Impedance:
600!2
Loop limit (excluding
set)
1000
a
at nominal
48
V
(excluding set)
Leakage resistance
30,000
sz
Ring trip
Ringing voltage
Signaling
Supervision
Power input from
shelf backplane
Insertion loss
Effective gain
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
f
1dB at 1020 Hz
3SdB
loss for analog to F’CM,
2.5dB loss for PCM to analog
1.5dB at 1020 Hz
Analog line card description 553-3001-l 61
-.