Cabling Specifications A-9
Serial Adapter Cable Pinouts
Table A-10 X.21 Adapter Cable Signals
FSIP End, HD
60-Position
Plug DTE Cable
Network
End,
DB-15 Plug
SIP End, HD
60-Position
Plug DCE Cable
Network End,
DB-15
Receptacle
Signal (J1) Pin Pin Signal (J2) Signal (J1) Pin Pin Signal (J2)
Ground 46 1 Shield ground 46 1 Shield ground
TxD/RxD+
TxD/RxD–
11
12
—>
—>
2
9
Transmit+
Transmit–
RxD/TxD+
RxD/TxD–
28
27
<—
<—
2
9
Transmit+
Transmit–
RTS/CTS+
RTS/CTS –
9
10
—>
—>
3
10
Control+
Control–
CTS/RTS+
CTS/RTS –
1
2
<—
<—
3
10
Control+
Control–
RxD/TxD+
RxD/TxD–
28
27
<—
<—
4
11
Receive+
Receive–
TxD/RxD+
TxD/RxD–
11
12
—>
—>
4
11
Receive+
Receive–
CTS/RTS+
CTS/RTS –
1
2
<—
<—
5
12
Indication+
Indication–
RTS/CTS+
RTS/CTS–
9
10
—>
—>
5
12
Indication+
Indication–
RxC/TxCE+
RxC/TxCE–
26
25
<—
<—
6
13
Timing+
Timing–
TxC/RxC+
TxC/RxC –
24
23
—>
—>
6
13
Timing+
Timing–
Circuit ground 15 8 Circuit ground Circuit ground 15 8 Circuit ground
Ground
Mode_2
48
47
Shorting group Ground
Mode_2
48
47
Shorting
group
Ground
Mode_DCE
51
52
Shorting group
Not used 16 8 Not used Not used 16 8 Not used
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