35
APPENDIX: Connector Pinouts
A.2 The RS-530 Interface
Here is the EIA/TIA RS-530 pinout for the FradSwitch A/S 3 Port’s RS-530 main-
link-ports. This is also the pinout for the unadapted X.21 main-link ports; the
adapter cable that comes with the X.21 versions of the Switch patches these ports
to their standard DB15 connector (see
Section A.4
).
ITU-T RS-530
RS-530
Signal
Signal/Lead Name
V.24
(DB25)
Circuit
Abbreviation
Circ.
Pin
Ref.
Ref.
101
1
––
SHD
Shield (Chassis Ground)
102
7
AB
SGND
Signal Ground
103
2
BA
TD A
Transmitted Data A
14
BA
TD B
Transmitted Data B
104
3
BB
RD A
Received Data A
16
BB
RD B
Received Data B
105
4
CA
RTS A
Request to Send A
19
CA
RTS B
Request to Send B
106
5
CB
CTS A
Clear to Send A
13
CB
CTS B
Clear to Send B
107
6
CC
DCR A
DCE Ready A
22
CC
DCR B
DCE Ready B
108.2
20
CD
DTR A
DTE Ready A
23
CD
DTR B
DTE Ready B
109
8
CF
RLSD (CD) A
Rcvd. Line Sgnl. Detector (Carrier Detect) A
10
CF
RLSD (CD) B
Rcvd. Line Sgnl. Detector (Carrier Detect) B
113
24
DA
TSETT (EXTTC) A
Transmitter Signal Element Timing (DTE)
(External Transmit Clock) A
11
DA
TSETT (EXTTC) B
Transmitter Signal Element Timing (DTE)
(External Transmit Clock) B
114
15
DB
TSETC (TC) A
Transmitter Signal Element Timing (DCE)
(Transmit Clock) A
12
DB
TSETC (TC) B
Transmitter Signal Element Timing (DCE)
(Transmit Clock) B
115
17
DD
RSETC (RC) A
Receiver Signal Element Timing (DCE)
(Receive Clock) A
9
DD
RSETC (RC) B
Receiver Signal Element Timing (DCE)
(Receive Clock) B
140
21
RL
RL
Remote Loopback
141
18
LL
LL
Local Loopback
142
25
TM
TM
Test Mode
