Installation guide

A-50 Cisco 4000 Series Installation Guide
Serial Cables
X.21 Dual Serial Module Cable Assembly
Figure A-9 shows the dual serial module X.21 cable assembly. Table A-18 lists the DTE
pinouts; Table A-18 lists the DCE pinouts. Arrows indicate signal direction: —> indicates
DTE to DCE, and <— indicates DCE to DTE.
J8-200
J8-199
O_TXD/RXD+
O_TXD/RXD-
Twisted pair #1 —>
—>
RD+
RD-
J7-R
J7-T
J8-194
J8-193
I_RXC/TXCE+
I_RXC/TXCE-
Twisted pair #4 <—
<—
SCTE+
SCTE-
J7-U
J7-W
J8-198
J8-197
O_TXCE/RXC+
O_TXCE/RXC-
Twisted pair #2 —>
—>
SCR+
SCR-
J7-V
J7-X
J8-192
J8-191
IO_TXC/TXC+
IO_TXC/TXC-
Twisted pair #5 —>
—>
SCT+
SCT-
J7-Y
J7-AA
Table A-17 Low-Speed V.35 DCE Compact Octal Serial Cable Pinouts
(Continued)
Router End (200-Position Plug) Network End (34-Pin Connectors)
Pin Signal Note Direction Signal Pin