363-206-305
Technical Specifications
10-72
Issue 3 June 2000
Table 10-32. Transmission Specifications — VF Channel Units with Adjustable
Settings
Parameter
2-Wire E
SPOTS
®
CUs(AUA42, AUA43)
4-Wire CUs
(AUA41, AUA44, AUA54)
Loop Resistance (beyond
HDT, excluding telset)
CSA loops 0-2800 ohms (loop start,
ground-start) 0-5000 ohms
(DX)
Gain Range (Granularity)
Metallic Interface to digital
line
−
1.0 dB to 6.75 dB
(in 0.25-dB steps)
Range depends on function
code
Digital line to metallic
interface
−
8.0 dB to 1.5 dB
(in 0.25-dB steps)
Granularity
=
0.1 dB
Gain Tracking
Input
−
37 to
+
3 dBm
±
0.25 dB
±
0.25 dB
Input
−
50 to
−
37 dBm
±
0.50 dB
±
0.50 dB
Equalization (Slope type) Equalized CSA
cable roll-off at 0.4 kHz
varies from 0.0 dB to 1.1
dB; at 2.8 kHz, roll-off
varies from 0.3 dB to 1.75
dB
Post-equalization of cable
less than 15 dB (H88) or 18
kft (NL) is comparable to D4
4FXS CU (J98726SB). Pre-
equalization and post-
equalization available by
emulating 150-ohm
mismatch.
Structural Impedance
600 ohms
+
2.16
µ
F or 900
ohms
+
2.16
µ
F
600 ohms or 1200 ohms
ERL/SRL (2-wire return loss
with 4-wire path broken)
28/20 dB
RL (any Hz) / RL (1 kHz) 23/28 dB
Balance Capability, CSA
loops
ERL better than 12 dB at
digital line interface of
channel unit facing loop
—
Longitudinal Balance
(IEEE method)
AUA42 AUA43
200 Hz 63 dB 58 dB 67 dB
500 Hz 63 dB 58 dB 67 dB
1,000 Hz 63 dB 58 dB 67 dB
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