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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