Browse Prior Art Database

Equalization of Multidrop Communication Network with Loop Subnetworks

IP.com Disclosure Number: IPCOM000081977D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Abbiate, JC: AUTHOR [+2]

Abstract

Equalization of multidrop communication networks, as shown in the drawing, is a complicated problem in that the control station modem CM receiver is able to receive signals from various sources, namely tributary stations S11, S12, S21, S22 through transmission paths of different length and characteristics.

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Equalization of Multidrop Communication Network with Loop Subnetworks

Equalization of multidrop communication networks, as shown in the drawing, is a complicated problem in that the control station modem CM receiver is able to receive signals from various sources, namely tributary stations S11, S12, S21, S22 through transmission paths of different length and characteristics.

It is proposed to allocate an address to every tributary station modem in the form of a single frequency easily recognizable at a modem receiver, even if the corresponding line has not been equalized and to proceed as follows.

When the installation is first set for operation, every morning for example, control modem CM initiates the equalization procedure by sending to first tributary modem TM11 a special message, comprised of address frequency F1 followed by an equalization pattern. TM11 receiver recognizes address F1, computes equalization parameters for transmission path CM-TM11, and simultaneously sends to tributary modem TM12 a special message comprised also of address frequency F1 followed by an equalization pattern.

TM12 receiver in turn recognizes address F1, computes equalization parameters for transmission path TM11-TM21, and simultaneously sends back to CM a special message still comprised of F1 and an equalization pattern. On reception of this message, CM receiver computes equalization parameters corresponding to the transmission path between TM12 and CM, and stores them into memo...