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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)