DMC11 Synchronous Serial Controller

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The DMC11 Synchronous Serial Controller is a single-line synchronous serial line interface for the UNIBUS.

It consists of two modules:

  • the DMC11-AD processor module (M8200)
  • a line module, one of:
    • DMC11-MA (M8202) High Speed Line Unit with Integral Modem (1M), for local coaxial cables up to 6,000 feet
    • DMC11-MA (M8202) High Speed Line Unit with Integral Modem (56K), for local coaxial cables up to 18,000 feet
    • DMC11-DA/-FA (M8201) Low Speed Line Units (-DA: EIA/CCITT V24 up to 19.2K / -FA: CCITT V35 up to 56K), for use with Bell modems 208, and 209

All modules are hex cards; the processor module is an SPC hex card, the line unit modules are notched hex cards.

The DMC11 uses DMA to transfer data. It can operate in either half-duplex or full-duplex, at baud rates up to 1M bits/second (depending on the line module used and cable length) providing 16-bit CRC, and supports point-to-point operation only.

The DMC11 supports the DDCMP (version 3.1 only) and Bit Stuff line protocols; a ROM-controlled microprocessor is used to implement DDCMP the protocol.

Other Synchronous Serial Controllers (e.g. DMR11, DMP11) have to be switched to "DMC Mode" (DDCMP V3.1) to be able to communicate with DMC11s.

See also

External links