PRACTICE 553-2201-183
TECHNICAL SUMMARY 4.09 A technical summary of the line circuit pack is given in Table
4-A.
Table 4-A
TECHNICAL SUMMARY OF LINE CIRCUIT PACK
Impedance:
QPC452/521,
QPC494/558
QPC594/129/189,
QPC681/682
QPC192/292
QPC532
600 R
600 R
900
n
600 R, matches 3-component complex
impedances
+
Loop Limit (excluding set):
QPC192/292
All others
1400
R
at nominal -48 V
1000
R
at nominal -48 V
Leakage Resistance
QPC532
All others
Ring Trip
Ringing Voltage
Signaling
Supervision
Power input from shelf backplane
Insertion loss
Effective Gain
(QPC192/292)
20,000 R
30,000 R
During silent or ringing intervals
Determined by the type of ringing generator
provided in the system
Loop start
Normal battery conditions are continuously
applied
(-48
V on ring: ground on tip) --
-52, -48, i-6, -6, i-2.5 V and ringing voltage:
also -150 V on Message Waiting Line cards.
5,
+1
dB,
at 1020 Hz
1.5 dB at 1020 Hz
Page 4-3