DMC11 Synchronous Serial Controller

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

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.

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

See also

• DMR11 synchronous serial line interface
• DMP11 synchronous serial line interface

External links

• DMC11 IPL microprocessor technical manual
• DMC11 IPL microprocessor maintenance manual
• DMC11 IPL synchronous line unit maintenance manual
• DMC11 IPL microprocessor user's manual
• DMC11 IPL synchronous line unit user's manual
• MP-00076 DMC11 DMC11 Engineering Drawings Rev. C
• MP-00076 DMC11 DMC11 Engineering Drawings Rev. D