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25 pin D-SUB male connector layout
25 pin D-SUB male connector
15 pin D-SUB male connector layout
15 pin D-SUB male connector
Pin
Name		 Pin
Number		 Direction Pin
Number		 Pin
Name		 Description
  2 -?- 2    Transmit A
  3 -?- 4    Receive A
  4 -?- 3    Control A
  6 -?- 12    Indication B
  7 -?- 8    signal ground
  8 -?- 5    Indication A
  14 -?- 9    Transmit B
  15 -?- 6    Signal timing A
  16 -?- 11    Receive B
  20 -?- 10    Control B
  21 -?- 13    Signal Timing B

I use this pinout to connect a DB25 interface of a router to a DB15 port of a modem

 
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