Browse Prior Art Database

Improvement to Channel Multiplexing

IP.com Disclosure Number: IPCOM000045100D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Cholat-Namy, J: AUTHOR

Abstract

Represented in the figure is a communication network including a primary subnetwork and a secondary subnetwork. The primary subnetwork provides communication between modems M1 and M2, with M1 being connected to a host unit through channels A, B, C, and D. The communication between M1 and M2 is performed at 9,600 bps. The secondary subnetwork provides communication between M2 and remote units (modems) C1 through C4 using tail channels A', B', C', and D'. Modem C1 is able to run at 9600 or 4,800 bps.

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Improvement to Channel Multiplexing

Represented in the figure is a communication network including a primary subnetwork and a secondary subnetwork. The primary subnetwork provides communication between modems M1 and M2, with M1 being connected to a host unit through channels A, B, C, and D. The communication between M1 and M2 is performed at 9,600 bps. The secondary subnetwork provides communication between M2 and remote units (modems) C1 through C4 using tail channels A', B', C', and D'. Modem C1 is able to run at 9600 or 4,800 bps.

Let us suppose that the network is operating with the following configuration: - A A1 4800 bps,

- B B' 2400 bps,

- C C' 2400 bps.

Let also A A' operating at 9,600 bps be a back-up configuration, in which case channels B B' and C C' should be out of service. A means should be provided for performing the network configuration modification. For that purpose, modem M2 should be provided with means for scanning the incoming data to detect a specific command embedded in the data flow.

This command, after being detected by M2, will be used to turn on/off a DSRS line (CCITT interface) controlling the full speed/back-up speed of modem C1. The command might also be sent to C1 which decodes it and runs at indicated speed.

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