Adaptable time division switch

Details Adaptable time division switch Adaptable time division switch

1975-03-14

1976-07-27

Robinson, Thomas A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340347DD, H03K 1322, H04J 300, H04L 300, G06F 500

Patent

active

039718913

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.
An all digital CVSD/PCM converter is provided and is time shared to participate in the functions of; analog/CVSD conversion, PCM/CVSD conversion and conference calling. The all digital CVSD/PCM converter is implemented by selecting binary equivalents for the time constants and exponential values which appear in an analog to CVSD converter.

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