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Hierarchical Multiprocessor System for Telephone Switch Network

IP.com Disclosure Number: IPCOM000041868D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Chang, LL: AUTHOR [+4]

Abstract

This time division multiplex (TDM) telephone switching system, suited for private exchange and call director-type applications, features a hierarchy of processors and separate bussing paths for telephone traffic (digital data and pulse code modulated [PCM] voice) and control signals. This arrangement allows for efficient implementation of systems having various traffic capacities and functional requirements. Referring to the accompanying illustration, processors 1 and 2 have hierarchical responsibilities relative to the system elements 3-7 which perform the calling functions (subscriber set sensing, tone or pulse dialing, subscriber set ringing and traffic switching). Processor 1 -- typically an IBM Series/1 miniprocessor -- is the dominant processing element.

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Hierarchical Multiprocessor System for Telephone Switch Network

This time division multiplex (TDM) telephone switching system, suited for private exchange and call director-type applications, features a hierarchy of processors and separate bussing paths for telephone traffic (digital data and pulse code modulated [PCM] voice) and control signals. This arrangement allows for efficient implementation of systems having various traffic capacities and functional requirements. Referring to the accompanying illustration, processors 1 and 2 have hierarchical responsibilities relative to the system elements 3-7 which perform the calling functions (subscriber set sensing, tone or pulse dialing, subscriber set ringing and traffic switching). Processor 1 -- typically an IBM Series/1 miniprocessor -- is the dominant processing element. It recognizes valid calls and other conditions, establishes routes for calls through the time slot interchanger 3 (i.e., the time division switch), creates records related to the calls (e.g., time and billing information), and maintains other statistical, diagnostic and control processes incidental to the operation of the system. Processor 2 -- typically, a microprocessor (e.g., Intel 8088) -- operates as an event monitor and message formatter relative to elements 3-7 and processor 1. Elements 3-7, whose functions are specified further below, may contain individual microprocessors operating as subordinates to processor 2. Processor 2 communicates with its associated memory 2a and elements 3-7 through its associated control bus 8. It also communicates with "host" processor 1 through bus 8, communication adapter 2b, I/O bus or channel 9, and host communication adapter 1a. Element 6 comprises subscriber line interfacing circuits (SLIC) which form traffic links between ports 6.1, 6.2, etc. -- extending to subscriber voice telephone sets and devices which issue and/or receive digital data -- and t...