Modular multiplex/demultiplex apparatus

Details Modular multiplex/demultiplex apparatus Modular multiplex/demultiplex apparatus

1978-05-01

1979-07-03

Brown, Thomas W.

H04J 302

Patent

active

041601262

ABSTRACT:
Modular multiplex/demultiplex apparatus suitable for use in a telephone communication system for processing data transmitted between local and remote telephone subscribers. The multiplex/demultiplex apparatus comprises a plurality of module units which may be interconnected together, for example, in one or more groups, for processing and routing data originating with local subscriber equipment to selected ones of a plurality of trunk group modules and associated modems for transmission to remote subscriber equipment, and for processing and routing data received by the trunk group modules and modems from remote subscriber equipment. Each module unit includes a shift register for receiving and shifting therealong a multiplexed signal received from a selected one of the trunk group modules. A counter counts the bits shifted along the shift register and when the shift register is full it produces an output count signal. A counter logic circuit of the module unit operates in response to an output count signal to respectively produce and apply a transfer signal and a full signal to a first latch register coupled to the shift register and to the counter logic circuit of the next module unit in the series. The transfer signal causes the latch register to receive the data from the shift register following which the data is further processed and read out to a plurality of demultiplex output lines. A counter logic circuit receiving a full output signal operates to produce a transfer signal and full output signal for use in the same manner as discussed above.

REFERENCES:
patent: 3637941 (1972-01-01), Rekiere
patent: 4071701 (1978-01-01), Leijonhufvud et al.
patent: 4092497 (1978-05-01), Laneau

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