A-5
Cable Specifications
Synchronous Serial Cable Assemblies and Pinouts
C
abl
e S
p
e
c
if
icat
ion
s
Table A-3.
Auxiliary Port Signaling and Cabling Using a DB-25 Adapter
a. Pin 1 is connected internally to Pin 8.
Synchronous Serial Cable Assemblies
and Pinouts
The illustrations and tables in this section provide assembly drawings and
pinouts for the EIA-530 DTE, EIA/TIA-232, EIA/TIA-449, V.35, and X.21 DTE
and DCE cables, which are used with the synchronous serial WAN port
(labeled “SERIAL”).
EIA-530
Figure A-3 shows the EIA-530 serial cable assembly, and A-4 lists the pinouts.
Arrows indicate signal direction: —> indicates DTE to DCE, and <— indicates
DCE to DTE.
Auxiliary
Port (DTE)
RJ-45-to-RJ-45
Roll-Over Cable
RJ-45-to-DB-25
Modem Adapter
Modem
Signal
RJ-45 Pin
RJ-45 Pin
DB-25 Pin
Signal
RTS
1
a
8
4
RTS
DTR
2
7
20
DTR
TxD
3
6
3
TxD
GND
4
5
7
GND
GND
5
4
7
GND
RxD
6
3
2
RxD
DSR
7
2
8
DCD
CTS
8
1
1
5
CTS
Summary of Contents for J3138A
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