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4TOLB-3L1
1306, Issue 2, May 1992
B. Loopback Parameters
Manual LB Activation
Via PC Board MAN Switch a) Switch on
b) Switch off
LB ON
LB OFF
Tone LB Activation (in RCV Input Port)
Tone Frequency 2713 ± 7 Hz
Tone Level Ref. at RX Facility port –30 to 0 dBm
Tone Duration for LB ON LB ON after tone removal 2.5 seconds
Tone Duration for LB OFF LB release during tone 0.6 second
Timer LB Deactivation Selectable 4 or 20 minutes
LB Level
LB Gain a) Range
b) Resolution
c) Steps
0 to ± 31.75 dB
.25 dB
.25, .5, 1, 2, 4, 8, 16
C. Power Requirements
–48 VDC Supply a) Range
b) Ripple, 120 Hz
c) Sealing current off, no loopback
d) Maximum
e) Power drain, max. (with nominal sealing current)
f) Heat dissipation, max. (with nominal sealing current)
–42.25 to –52.5 VDC
250 mV
3.5 mA
40 mA
1.92 W
1.92 W
–12 VDC Supply a) Tolerance
b) Max. current
c) Max. power drain
d) Max. heat dissipation
–12 VDC ± 5%
15 mA
180 mW
180 mW
+12 VDC Supply a) Tolerance
b) Max. current
c) Max. power drain
d) Max. heat dissipation
+12 VDC ± 5%
17 mA
204 mW
204 mW
+5 VDC Supply a) Tolerance
b) Max. current
c) Max. power drain
d) Max. heat dissipation
+5 VDC ± 10%
10 mA
50 mW
50 mW
Power (with Sealing
Current Source)
a) Max. power drain
b) Max. heat dissipation
2.33 W
2.33 W
Table 3. 4TOLB-3L1 Specifications (Continued)
Parameter Condition Value
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