Cables, Connectors, and Pin Assignments
E-11
9161-A2-GH30-20
September 1997
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
496-15146
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)
