Browse Prior Art Database

Multiple Scanning System for Telephone Control

IP.com Disclosure Number: IPCOM000079352D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Fiemeyer, P: AUTHOR

Abstract

Shown is an arrangement for performing the scanning of the status of telephone circuits (extensions, trunks, etc.). The telephone circuits, the status of which are to be scanned, are divided in a plurality of groups. Groups A and B are represented.

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Multiple Scanning System for Telephone Control

Shown is an arrangement for performing the scanning of the status of telephone circuits (extensions, trunks, etc.). The telephone circuits, the status of which are to be scanned, are divided in a plurality of groups. Groups A and B are represented.

A group of circuits is locally scanned through a low-speed central clock LSC, which sends pulses by bus 1A and B to each circuit. The result of this scanning is returned through bus 2A and 2B to a buffer. This buffer comprises a cell per telephone circuit to be scanned. Consequently, it reflects the telephone circuit status with a certain delay due to the low-speed scanning process. Then, the cells of the buffer are scanned through a high-speed clock H:SC and gating circuit G. Circuit G provides at its output the high-speed scan information.

This arrangement eliminates the drawbacks of local scanning systems, wherein the scanning function is performed at telephone circuit level. Thus it is no longer necessary to use very short and fast scan pulses with their consequent risk of noise. It also eliminates the drawbacks of centralized scanning systems, wherein all status information is sent separately from each point of the telephone circuit to a centralized scanner. This reduces the number of long cables from the telephone circuits.

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