Hybrid time multiplex switching system with optimized buffer mem

Details Hybrid time multiplex switching system with optimized buffer mem Hybrid time multiplex switching system with optimized buffer mem

1988-07-22

1989-11-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, 370 941, H04J 326

Patent

active

048842648

ABSTRACT:
A switching system for switching synchronous and/or synchronous data blocks between incoming and outgoing multiplexes. The asynchronous blocks are sporadically carried in the multiplexes. The cost of the system is reduced owing to the use of a single buffer memory whose cells memorize indifferently synchronous and asynchronous blocks. The number of cells is lower than the product of the number of incoming or outgoing multiplexes and the number of blocks per frame in the multiplexes. A buffer memory managing and write addressing circuit derives and memorizes the occupied or free condition of each of the buffer memory cells thereby permanently selecting the address of one of free buffer cells in which a data block is to be written. The occupied condition of a cell is signalled responsive to the write of an incoming data block into this cell, and the free condition of the cell is signalled responsive to the last read of the written block. A written block may be read several times when it should be transmitted onto several addressee outgoing multiplexes.

REFERENCES:
patent: 3988545 (1976-10-01), Kuemmerle et al.
patent: 4603416 (1986-07-01), Servel et al.
patent: 4611321 (1986-09-01), Gabrielli et al.
patent: 4612636 (1986-09-01), Grover et al.
patent: 4674033 (1987-06-01), Miller
patent: 4707826 (1987-11-01), Froggatt

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