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B-10 Sun Netra CP3240 Switch Installation Guide • September 2009
B.9 Serial Cable
The switch uses RJ-45 connectors for its serial ports. To connect to a PC’s DB9
connector, a special cable or adapter is needed. These cables and adapters are
available through various sources or can be made easily. The cable must cross over
the TXD and RXD signals, as both the PC and switch are DTE. The minimum cable
pinout is listed in the following table.
6 RXD
7 DSR
8 CTS~
TABLE B-9 Minimum Serial Cable Pinouts
RJ-45 DB9
RXD to TXD 6 3
TXD to RXD 3 2
GND to GND 5 5
TABLE B-8 Serial RJ-45 Connector (J13-Top) (Continued)
Pin Signal