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Browse Prior Art Database

Loop Network on Single Ended FDM Cable System

IP.com Disclosure Number: IPCOM000089482D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Becker, FL: AUTHOR [+2]

Abstract

Frequency Division Multiplex (FDM) cable bus systems allow point-to-point and multipoint interconnection of data sources and sinks. The present arrangement describes a method for retaining these network interconnections and simultaneously interconnecting other sources and sinks in a loop technology. This arrangement not only allows the formation of point-to-point, multipoint and loop networks on a single cable, but it also allows, through the use of FDM techniques, simultaneous operation of the different networks. Also, this arrangement provides an implementation of a loop network which does not require a physical return cable.

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Loop Network on Single Ended FDM Cable System

Frequency Division Multiplex (FDM) cable bus systems allow point-to-point and multipoint interconnection of data sources and sinks. The present arrangement describes a method for retaining these network interconnections and simultaneously interconnecting other sources and sinks in a loop technology. This arrangement not only allows the formation of point-to-point, multipoint and loop networks on a single cable, but it also allows, through the use of FDM techniques, simultaneous operation of the different networks. Also, this arrangement provides an implementation of a loop network which does not require a physical return cable.

The drawing shows the implementation of the proposed network. Sinks 5 and sources 7 connect directly to the cable bus as in a standard FDM system to form the point-to-point and multipoint network. All elements of the loop network (source 9, sink 11), except the front end and terminating source/sink element, connect to the FDM cable through selective transmission elements 13. The selective transmission element is a high-pass filter which allows frequencies above the baseband loop frequency band to pass directly down the cable. Lower frequency baseband signals are not passed by the selective transmission element, and instead are received by the loop sink through a coupling element. The loop signal is then propagated down the cable by the loop source. This process is continued until the final loop...