RS232 Pinouts
  RS366 Pinouts
  RS422 Pinouts
  RS423 Pinouts
  RS44 Pinouts
  RS530 Pinouts
  USB Pinouts

  V.35 Pinouts
  X.21 Pinouts
  ISDN Pinouts
  USOC Specification
  TIA 568 Specifications
  WECO Specification