Installation guide

Cabling Specifications A-53
Serial Cables
X.21 Four-Port Serial Module Cable Assembly
Figure A-10 shows the four-port serial X.21 cable assembly that is used on the NP-4T and
the high-speed serial ports on the NP-2T16S; Table A-20 lists the DTE pinouts; Table A-21
lists the DCE pinouts. Arrows indicate signal direction: —> indicates DTE to DCE, and
<— indicates DCE to DTE.
Figure A-10 Four-Port Serial Module X.21 Cable Assembly
J1-10
J1-26
449 RLSD Twisted pair J2-5
J2-12
X.21 IND
J1-43
J1-27
449 SCT Twisted pair J2-6
J2-13
X.21 CLK
J1-17 DCE SEL J1-44
J1-15 Chassis GND J2-1
Table A-19 Dual Serial Module X.21 DCE Cable Pinouts (Continued)
72-0737-01 DCE Connections
From Signal Name Type To Signal Name
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