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V.35 Loopback Plug Specifications
To retain FCC Class A qualification all cables must be fully shielded and the shielding must be connected to the metal connectors.
SG4P V.35 Cable |
Description |
Pin Number |
Description |
w |
HD-62 'I-E' plug |
w |
Tx Clock 3 A
Rx Clock 3 A
DTE Clock 2 A |
1
26
48 |
31
6 |
Rx Clock 2 A
Tx Clock 2 A |
RxData 3 A |
2 |
9 |
TxData 2 A |
RTS 3 |
3 |
27 |
CTS 2 |
TxData 3 A |
4 |
7 |
RxData 2 A |
DTR 3 |
5 |
51 |
DSR 2 |
CTS 3 |
22 |
8 |
RTS 2 |
DSR 3 |
46 |
10 |
DTR 2 |
Tx Clock 1 A
Rx Clock 1 A
DTE Clock 0 |
12
37
58 |
42
17 |
Rx Clock 0 A
Tx Clock 0 A |
RxData 1 A |
13 |
20 |
TxData 0 A |
RTS 1 |
14 |
38 |
CTS 0 |
TxData 1 A |
15 |
18 |
RxData 0 A |
DTR 1 |
16 |
61 |
DSR 0 |
CTS 1 |
33 |
19 |
RTS 0 |
DSR 1 |
56 |
21 |
DTR 0 |
TxData 3 B |
23 |
52 |
RxData 2 B |
GND |
24 |
29 |
GND |
RxData 3 B |
47 |
28 |
TxData 2 B |
Rx Clock 3 B
Tx Clock 3 B
DTE Clock 2 |
44
45
30 |
50
49 |
Tx Clock 2 B
Rx Clock 2 B |
TxData 1 B |
34 |
62 |
RxData 0 B |
GND |
35 |
40 |
GND |
RxData 1 B |
57 |
39 |
TxData 0 B |
Tx Clock 1 B
Rx Clock 1 B
DTE Clock 0 |
54
55
41 |
60
59 |
Tx Clock 0 B
Rx Clock 0 B |
Unused pins: |
11, 25, 32, 36, 43, 53 |
Rx=Receive, Tx=Transmit, CTS=Clear to Send, RTS=Ready to Send,
DTR=Data Terminal Ready, DSR=Data Set Ready, DCD=Data Carrier Detect
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