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D-13
3160-A2-GB21-80
March 1999
EIA-530-A-to-X.21 Cable Interface
The EIA-530-A-to-X.21 adapter (Figure D-9) provides the X.21 interface shown in
Table D-10.
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
TD-A
TD-B
RD-A
RD-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
RLSD-A
RLSD-B
SIG. COMMON
TT-A
TT-B
530
SIGNAL
DB25
PLUG
DB15
SOCKET
X.21
SIGNAL
495-14787
Figure D-9. EIA-530-A-to-X.21 Adapter
Table D-10. X.21 Cable Interface
Signal ITU-T Number Direction Pin
Signal Common 102 — 8
Transmitted Data 103 To DSU/CSU 2 (A)
9 (B)
Received Data 104 From
DSU/CSU
4 (A)
11 (B)
Request-to-Send 105 To DSU/CSU 3 (A)
10 (B)
Data Channel Received
Line Signal Detector
109 From
DSU/CSU
5 (A)
12 (B)
Transmit Signal Element
Timing (DTE Source)
113 To DSU/CSU 7 (A)
14 (B)
Receiver Signal Element
Timing (DCE Source)
115 From
DSU/CSU
6 (A)
13 (B)