Hardware/Ethernet Switch Console Cables

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Pins

RJ-45 - Looking at the connector from the non-cable end, with pins facing down, pins are counted left (1) to right (8), on regular ethernet patch leads, 1 is the Orange-White or Green-White conductor and 8 is the Brown conductor.

Male DB-9 - Usually numbered, but if looking at a male DB-9 from the non-cable end with the larger side towards the top, pins 1-5 left to right on top row, 6-9 left to right bottom row.

RS-232 DB-9

Pin Function
1 CD (Carrier Detect)
2 RX (Receive)
3 TX (Transmit)
4 DTR (Data Terminal Ready)
5 GND (Ground)
6 DSR (Data Set Ready)
7 RTS (Request To Send)
8 CTS (Clear To Send)
9 RI (Ring Indicator)

Alcatel

DB-9 RJ-45 RS-232
1 N/C CD
2 6 RX
3 3 TX
4 2 DTR
5 4 GND
6 7 DSR
7 1 RTS
8 8 CTS
9 N/C RI
N/C 5
RJ-45 DB-9 RS-232
1 7 RTS
2 4 DTR
3 3 TX
4 5 GND
5 N/C N/C
6 2 RX
7 6 DSR
8 8 CTS
N/C 1 & 9 N/C

Cisco

Cisco kit uses a similar DB-9 to RJ-45 adapter, except the RJ-45 side is rolled over/inverted (ie, pin 1 to pin 8, pin 2 to pin 7, etc), and pin 4 and 5 on the RJ-45 side is connected back to ground.

Handy Configurations

The molded Cisco cable acts as a DB-9 to RJ-45 + rollover combo. Adding another DB-9 to RJ-45 adapter to this gives a null modem configuration.