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Each 50-conductor plug carries four radio channels, referred to as Channel A, B, C and D.
Each channel includes twelve signals.
Figure 13
is a schematic of conventional signals, equivalent circuits, and the plug
connections on which they are found.
Table 22
is a summary of the signals found on each channel plug.
the wire colors for the 25-pair cables typically used to connect to the plugs.
Figure 15
show the corresponding punch-down connections.
Figure 13: Channel Signal Equivalent Circuits
50-Pin Connector Pin Numbers
Ch-A
Ch-B
Ch-C
1
7
13
26
32
38
2
8
14
27
33
39
3
9
15
28 gnd
34 v+
40 gnd
4
10
16
29
35
41
5
11
17
30
36
42
6
12
18
31
37
43
Ch-D
Signal
19
PTT +
44
PTT –
20
COR +
45
COR –
21
Aux Output
46 v+
Ground or V+
22
Tx Audio +
47
Tx Audio –
23
Rx Audio +
48
Rx Audio –
24
X-Busy Input
49
X-Busy Output
Wiring to the Channels
Table 22
1k
+12V
600 Ohm
600 Ohm
2.2uF
10K Ohm
10K Ohm
2.2 uF
+12V
3.3K Ohm
10K Ohm
also contains
Figure 14
and
67
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