John Chandler Wolcott

US Patent:

39718913, Jul 27, 1976

Filed:

Mar 14, 1975

Appl. No.:

5/558605

Inventors:

John R. Wolcott - Orlando FL

Assignee:

Martin Marietta Corporation - Rockville MD

International Classification:

H03K 1322
H04J 300
H04L 300
G06F 500

US Classification:

179 15AP

Abstract:

A switching network is disclosed that is capable of handling analog, PCM and CVSD signals connected to said network via loops or trunks. All signals are converted into CVSD format, synchronized to the network clocks, and switching is carried out on a time divided basis by shifting bits from one channel slot in the frame format on the input side of the switching circuit to a different channel slot in the frame format on the output side of the switching circuit. The multiplexing and demultiplexing of data on the input and output sides of the channel shifting mechanism is controlled by words in a random access memory. Thus, the mux-demux operation is easily varied by changing the word storage in the random access memory. The channel shifting is controlled by the words stored in a second random access memory. Thus, channel shifting is also easily varied.

US Patent:

RE299910, May 8, 1979

Filed:

Nov 21, 1977

Appl. No.:

5/853069

Inventors:

John R. Wolcott - Orlando FL

Assignee:

Martin Marietta Corporation - Orlando FL

International Classification:

H03K 1322
H04J 300
H04L 300
G06F 500

US Classification:

179 15AP

Abstract:

A switching network is disclosed that is capable of handling analog, PCM and CVSD signals connected to said network via loops or trunks. All signals are converted into CVSD format, synchronized to the network clocks, and switching is carried out on a time divided basis by shifting bits from one channel slot in the frame format on the input side of the switching circuit to a different channel slot in the frame format on the output side of the switching circuit. The multiplexing and demultiplexing of data on the input and output sides of the channel shifting mechanism is controlled by words in a random access memory. Thus, the mux-demux operation is easily varied by changing the word storage in the random access memory. The channel shifting is controlled by the words stored in a second random access memory. Thus, channel shifting is also easily varied.