Serial

Where it is used today:

Signals in RS-232/Serial console (9 pin)

RS-232 Abbreviation Signal Name
1 DCD Carrier Detect
2 RxD Received Data
3 TxD Transmitted Data
4 DTR Data Terminal Ready
5 G Common Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicator

Cisco light blue cable

RS-232(9pin) 1 2 3 4 5 6 7 8 9
RJ-45 3 6 7 4 2 8 1

Null modem(9pin - 9pin)

RS-232(9pin) 1 2 3 4 5 6 7 8 9
RS-232(9pin) 3 2 6 5 4 8 7

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