IBM 270x

270x is a generic name for a family of IBM non-programmable communications controllers used with System/360 and System/370 computers.

The family consisted of the following devices:

  • IBM 2701 Data Adapter Unit
  • IBM 2702 Transmission Control
  • IBM 2703 Transmission Control

    • The 2701 and 2702 were announced simultaneously with System/360 in 1964, the 2703 was announced a year later.

    The 270x series was superseded by the IBM 3704 and 3705 communications controllers in 1972.

    2701

    The 2701 supported up to four start-stop or synchronous communications lines. It had two multiplexor channel interfaces for connection to one or two host computers. The synchronous adapter originally supported the Synchronous Transmit-Receive (STR) protocol, and later Binary Synchronous Communications (BISYNC) when it was introduced in 1967, in half duplex mode at speeds of up to 40,800 bits per second (bit/s). The 2701 could also have "data acquisition and control adapters" for direct control of external equipment.

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