A-14
CRBRIM-W/T
Appendix A: Cabling Specifications
A.2.5 X.21
Figure A-5 shows the X.21 cable assembly; Table A-9 lists the DTE pinout; Table
A-12 lists the DCE pinout.
Arrows indicate signal direction: —> indicates DTE to
DCE, and <— indicates DCE to DTE.
Figure A-5. X.21 Cable Assembly
1. Any pin not referenced is not connected.
J1-26
J1-25
RxC/TxCE+
RxC/TxCE–
Twisted pair no. 4
<—
<—
J2-U
J2-W
SCTE+
SCTE–
J1-22
J1-21
NIL/RxC+
NIL/RxC–
Twisted pair no. 3
—>
—>
J2-V
J2-X
SCR+
SCR–
J1-20
J1-19
TxCE/TxC+
TxCE/TxC–
Twisted pair no. 2
—>
—>
J2-Y
J2-AA
SCT+
SCT–
Table A-8. V.35 DCE Cable Pinout
(DB-60 to Winchester-Type 34 Pin) (Continued)
60 Pin
1
Signal
Note
Direction
34 Pin
Signal
H1974
60-pin connector (J1)
15-pin connector (J2)
Connectors are not to scale
J2-8
J2-15
J2-9
J2-1
J1-46
J1-45
J1-16
J1-15
J1-1
J1-30
J1-31
J1-60