Cpu channel to cpu channel extender

Abstract From the Canadian patent

A system is described with which a channel of an IBM central processor unit (CPU) may communicate at channel speed with a channel of another CPU over extended distances. The system incorporates coupler units at each CPU site and each coupler unit has high speed dedicated data transfer logic that is enabled during data transfer by a microprocessor. During initial selection sequences the microprocessor controls and sets up conditions for data communication through a high speed serial full duplex data link capable of accommodating channel speed data transfers. Each coupler employs suitable parallel to serial and serial to parallel converters. Parity error checks are performed throughout the …