1975-05-30
1976-05-25
Stewart, David L.
179 15AQ, H04Q 1104
Patent
active
039595960
ABSTRACT:
A TDM switching network for a communication system having 17 input transmission lines for carrying TDM digital signals in 64 input channels on each input line and having 15 output transmission lines for carrying TDM digital signals in 64 output channels on each output line. The TDM switching network establishes connections between selected input and output channels in accordance with address instructions having A and B address segments each designating a particular channel of a particular transmission line. The switching network includes 15 switching matrices (plus a spare). Each matrix is connected to all 17 of the input transmission lines and to a different one of the output transmission lines. Each switching matrix includes a data memory which can store a data bit for each channel of each transmission line. Each matrix also includes an address memory which can store an address segment for each channel of the associated output transmission line at a corresponding storage location. An address instruction is transmitted to all the switching matrices and comparisons are made by each matrix to determine if the transmission line designated by either address segment designates the output transmission line associated with the matrix. The matrix having the output line designated by the A address segment loads the B address segment in its address memory in the storage location corresponding to the channel designated by the A address segment. Similarly, the A address segment is placed in the matrix and at the storage location corresponding to the transmission line and channel designated by the B address segment. The storage locations of an address memory are read out in sequence by corresponding channels. If an address segment is read out of the address memory, the data bit designated thereby is selected from the data memory and applied to the output transmission line of the matrix in the channel corresponding to the storage location the address segment occupies in the address memory.
REFERENCES:
patent: 3678205 (1972-05-01), Cohen
patent: 3715505 (1973-02-01), Gordon
patent: 3761894 (1973-09-01), Pilc
patent: 3860761 (1975-01-01), O'Neill
Bojanek Robert J.
Field Robert G.
Mason Marvin S.
GTE Sylvania Incorporated
Keay David M.
Nealon Elmer J.
O'Malley Norman J.
Stewart David L.
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