SYSTEM FOR INTERNETWORKING DATA TERMINAL EQUIPMENT THROUGH A SWITCHED DIGITAL NETWORK

摘要

The invention uses a scheme of inverse multiplexing whereby a high bandwidth information stream (204) is first split into multiple narrow band signals for transmission through a public switched digital network over a plurality of narrow band channels (64, 65, 66, 67) to be received at the remote location by another Switched Network Access System then recombined to form the original high bandwidth information stream. The bidirectional direct memory accss (DMA) request and control switch (154) of the present invention accepts requests for service from a plurality of peripherals, such as B-channel controllers (158, 160, 162, 164), then selects and assigns the requests on a call-by-call basis to any one of a plurality DMA requests lines utilizing a programmable DMA assignment register.