Appendix F -
Composite Link DB15 Pinout
DB15 Composite Interface
Pin Connections (DTE)
DB15 Mux
Connector
X.21/V11
V.35
V.24
G.703
Type at
Connector
(Normal Use)
1
PROTECTIVE GROUND
-
8
G
COMMON
COMMON
-
Common
Return
2
T(A)
TXDa
TXD
T(A)
Generator
9
T(B)
TXDb
-
T(B)
Generator
3
C(A)
RTS
RTS
S(R)
5
Generator
10
C(B)
DTR
DTR
S(T)
5
Generator
4
R(A)
RXDa
RXD
R(A)
Load
11
R(B)
RXDb
-
R(B)
Load
5
I(A)
DCD
DCD
S(ext)
5
Load
12
I(B)
DSR
DSR
-
Load
6
S(A)
2
RXCa
3
RXC
-
Load
13
S(B)
2
RXCb
3
-
-
Load
7
-
TXCa
3
TXC
4
-
Load
14
-
TXCb
3
TXCO
4
-
See Note 1
Notes:
1
Pin 14 on Mux
V.11
Not Connected
V.35
Load
V.24
Generator
2
V.11 Clocks S(A), S(B) may be configured as generators for DCE or test purposes.
3
V.35 Clocks TXC and RXC may be configured as generators for DCE or test purposes.
4
TXC should be derived from TXCO externally for V.24 Internal Clock and clock
turnaround mode.
5
G.703 interface Transmit and Receive
screens
should be connected to S(T) and S(R)
respectively. An on-board link connects these to signal ground (1-2) or S (Ext) External
Ground (2-3.) External ground may be connected externally to Pin 1 if link grounding to
protective/chassis ground
if required.
6
Connector shell and termination must be as specified in the EMC section (Appendix C.)
