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EIA-530-A-to-X.21 Cable Interface
The EIA-530-A-to-X.21 adapter
the X.21 interface shown in
Figure D-9.
Table D-10. X.21 Cable Interface
3160-A2-GB21-90
530
DB25
SIGNAL
PLUG
TD-A
2
TD-B
14
RD-A
3
RD-B
16
RXC-A
17
RXC-B
9
RTS-A
4
RTS-B
19
RLSD-A
8
RLSD-B
10
SIG. COMMON
7
TT-A
24
TT-B
11
EIA-530-A-to-X.21 Adapter
Signal
Signal Common
Transmitted Data
Received Data
Request-to-Send
Data Channel Received
Line Signal Detector
Transmit Signal Element
Timing (DTE Source)
Receiver Signal Element
Timing (DCE Source)
February 2001
(Figure D-9, EIA-530-A-to-X.21
Table D-10, X.21 Cable
Interface.
ITU-T Number
102
103
104
105
109
113
115
D. Pin Assignments
Adapter) provides
X.21
DB15
SIGNAL
SOCKET
2
TD-A
9
TD-B
4
RD-A
11
RD-B
6
RXC-A
13
RXC-B
3
RTS-A
10
RTS-B
5
RLSD-A
12
RLSD-B
8
SIG. COMMON
7
TT-A
14
TT-B
495-14787
Direction
Pin
—
8
To DSU/CSU 2 (A)
9 (B)
From
4 (A)
DSU/CSU
11 (B)
To DSU/CSU 3 (A)
10 (B)
From
5 (A)
DSU/CSU
12 (B)
To DSU/CSU 7 (A)
14 (B)
From
6 (A)
DSU/CSU
13 (B)
D-13
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