8P8C and DE-9 adapters

8P8C and DE-9 adapters

8P8C Connector and its pins

1. Most commonly used connector for the twisted pair.
2. Is used for two kinds of cables - straight and cross-over

Pure Serial Cable

1 unmapped
2 uz 3
3 uz 2
4 unmapped
5 uz 5
6 unmapped
7 unmapped
8 unmapped
9 unmapped

COM1 Connector and its pins

1. The numbering of pins for a DE-9 (a.k.a. DB-9) male connector. Each circle represents a pin. The picture is shown from the pin side.
2. Such are used for "serial ports" in various computing devices that transmit signal via RS-232 standard.

DE-9 - 8P8C adapter

1. The correspondence between DE-9 pins and 8P8C pins in Cisco Serial Console Cables:

   Serial port pin 1 - not connected to 8P8C
   Serial port pin 2 - connected to pin 3 (8P8C)
   Serial port pin 3 - connected to pin 6 (8P8C)
   Serial port pin 4 - connected to pin 7 (8P8C) 
   Serial port pin 5 - connected to pin 4 and 5 (8P8C)
   Serial port pin 6 - connected to pin 2 (8P8C)
   Serial port pin 7 - connected to pin 8 (8P8C)
   Serial port pin 8 - connected to pin 1 (8P8C)
   Serial port pin 9 - not connected to 8P8C

Serial port 2 - pin 6
Serial port 3 - pin 3
Serial port 4 - unmapped
5 uz 4

1. A sample of wire colors in adapter from female 8P8C to male DE-9.

8P8C pin 1 - blue wire - serial port 8
8P8C pin 2 - orange wire - serial port 6
8P8C pin 3 - black wire - serial port 2
8P8C pin 4 - red wire - serial port 5
8P8C pin 5 - green wire - serial port 5? 
8P8C pin 6 - yellow wire - serial port 3
8P8C pin 7 - brown wire - serial port 4
8P8C pin 8 - white wire - serial port 7

Links

1. Cisco Serial Console Cables
2. http://www.nullmodem.com/RJ-45.htm

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