Cables, Connectors, and Pin Assignments

E-11

9161-A2-GH30-30 April 1998
EIA-530A-to-X.21 DTE Adapter Cable

Used as an interface between the 25-position Sync Data Port connector and a

DTE’s X.21 connector.

2
14
3
16
17
9
4
19
8
10
7
24
11
2
9
4
11
6
13
3
10
5
12
8
7
14
TXD-A
TXD-B
RXD-A
RXD-B
RXC-A
RXC-B
RTS-A
RTS-B
RLSD-A
RLSD-B
Sig. Common
TT-A
TT-B
TD-A
TD-B
RD-A
RD-B
RXC-A
RXC-B
RTS-A
RTS-B
RR-A
RR-B
Sig. Common
TT-A
TT-B
530
Signal DB25
Plug DB15
Socket X.21
Signal
496-1514
6

The following table provides the pin assignments for the 25-position Port 1 or

Port 2 connector/interface and a DTE’s 15-position X.21 connector/interface.

Signal ITU/

CCITT #

25-Pin

Plug

Pin # Direction

15-Pin

Socket

Pin #
Transmit Data (TXD/TD ) 103 2 (A)
14 (B) To DCE 2 (A),
9 (B)
Received Data (RXD/RD ) 104 3 (A)
16 (B) From DCE 4 (A),
11 (B)
Request to Send (RTS) 105 4 (A)
19 (B) To DCE 3 (A),
10 (B)
Signal Ground/Common 102 7 — 8
Data Channel Received Line
Signal Detector/Receiver Ready
(RLSD/RR )
109 8 (A)
10 (B) From DCE 5 (A),
12 (B)
Receiver Signal Element Timing
(RXC) — DCE Source 115 17 (A )
9 (B) From DCE 6 (A),
13 (B)
Transmitter Signal Element Timing/
Terminal Timing (TT) —
DTE Source
113 24 (A )
11 (B ) To DCE 7 (A),
14 (B)