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X.21
Figure C-10 shows the X.21 cable assembly. Table C-13 lists the DTE pinouts. Table C-14
lists the DCE pinouts. Arrows indicate signal direction: —> indicates DTE to DCE, and
<— indicates DCE to DTE.
Figure C-10
J1-46
J1-45
J1-16
J1-15
J1-1
J1-30
J1-31
J1-60
Table C-13
60 Pin
J1-48
J1-47
J1-51
J1-52
J1-46
J1-11
J1-12
X.21 Cable Assembly
60-pin connector (J1)
Connectors are not to scale
X.21 DTE Cable Pinouts (DB-60 to DB-15)
Signal
Description
GND
Shorting group
MODE_2
GND
Shorting group
MODE_DCE
Shield_GND
Single
TxD/RxD+
Twisted pair no. 3
TxD/RxD–
Synchronous Serial Cable Assemblies and Pinouts
Direction 15 Pin
–
–
–
–
–
J2-1
—>
J2-2
—>
J2-9
15-pin connector (J2)
J2-8
J2-15
J2-9
J2-1
Signal
–
–
Shield GND
Transmit+
Transmit–
Cable Specifications C-21
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