Serial (RS232) modem cable (DB9-DB15). Pinout and signals for building a serial (RS232) modem cable

This cable should be used to connect an internal 14.4kbps Speedster modem to a computer.

D9 pin D-SUB female to the PC DB9 pin D-SUB female to the PC
DB15 pin D-SUB male to the modem DB15 pin D-SUB female to the modem

  9 pin 15 pin Direction
Carrier Detect 1 11 ←
Receive Data 2 13 ←
Transmit Data 3 12 →
Data Terminal Ready 4 10 →
System Ground 5 1+8+15
Data Set Ready 6 3 ←
Request to Send 7 4 →
Clear to Send 8 5 ←
Ring Indicator 9 6 ←