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Appendix C - Cabling Diagrams
Composite Link Cabling
PIN NO.
1
2
3
4
5
7
8
15
17
20
25
1
2
3
4
5
7
8
15
17
20
25
To
External
Synchronous
Modem/DSU/
Terminal Adapter
Connector
CHASSIS GROUND (AA)
TRANSMIT DATA (BA)
RECEIVE DATA (BB)
REQUEST TO SEND (CA)
CLEAR TO SEND (CB)
SIGNAL GROUND (AB)
CARRIER DETECT (CF)
TRANSMIT CLOCK (DB)
RECEIVE CLOCK (DD)
DATA TERMINAL READY (CD)
PIN NO.
V.35 34-PIN
CONNECTOR (MALE)
25-PIN
CONNECTOR (FEMALE)
A
B
C
D
E
F
H
P
R
S
T
U
V
W
X
Y
AA
1
7
4
5
6
8
20
2
3
12
22
23
17
25
18
15
21
PROTECTIVE GROUND
SIGNAL GROUND
REQUEST TO SEND
CLEAR TO SEND
DATA SET READY
DATA CARRIER DETECT
DATA TERMINAL READY
TRANSMIT DATA A
RECEIVE DATA A
TRANSMIT DATA B
RECEIVE DATA B
EXTERNAL TX CLOCK A
RECEIVE CLOCK A
EXTERNAL TX CLOCK B
RECEIVE CLOCK B
TRANSMIT CLOCK A
TRANSMIT CLOCK B
RS232C/V.24 Configured Composite Link*
V.35 Adapter Cable Configured on a
RS232C/V.35 Composite Link**
To DataTalker
RS232C/V.35
Connector
* The DataTalker RS232C interface circuits have been designed to meet the electrical specifications
given in EIA (Electronic Industries Association) RS232C and ITU-T (International Telecommunications
Union) V.24 Standards.
** When configured for V.35 interface operation on the composite link, the V.35 adapter cable should
be used. This cable uses a 25-pin female connector at one end and a 34-pin Winchester male
connector at the other end.