Multiplex communications – Wide area network – Packet switching
Patent
1991-08-09
1993-08-10
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 851, 370 8511, H04J 302
Patent
active
052355942
ABSTRACT:
In a switching system for voice input/output devices, voice data is sampled, e.g., at an 8 KHz rate. To minimize overhead, the maximum number of devices in a system have a time slot for outputting data. Thus, the system operates at a system clock rate of 8 KHz times the maximum number of devices to be supported. In the illustrated embodiment, 768 devices are supported and thus the system operates at a 6.144 MHz clock rate. To enable such a large number of devices to be supported at a relatively slow clock rate, the data is transmitted in parallel. The switching system is constructed as N buckets or cabinets of M processing modules, each connected to J devices. A bus controller for each bucket connects the multiprocessing system bus in that bucket to intersystem buses connected to bus controllers in adjacent cabinets. Voice data samples are collected by a module collection bus and transferred to a bucket collection bus following data from any preceding buckets. When the final bus controller is reached, the collected voice data passes through a return bus which connects the bucket collection bus entering the final bus controller to a bucket distribution bus exiting the final bus controller. The bus controllers route the data on the bucket distribution bus to all of the processing modules connected thereto on a module distribution bus and pass the distribution data on to the next bus controller.
REFERENCES:
patent: 4564938 (1986-01-01), Boot
patent: 4608685 (1986-08-01), Jain et al.
Blum Russell
Olms Douglas W.
Westinghouse Electric Corp.
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