Browse Prior Art Database

Non-Disruptive Switched Network Back-Up

IP.com Disclosure Number: IPCOM000048365D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Cukier, M: AUTHOR [+2]

Abstract

Non-disruptive switched network back-up is a network configuration which intends to solve problems encountered with conventional 4-wire switched network back-up.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Non-Disruptive Switched Network Back-Up

Non-disruptive switched network back-up is a network configuration which intends to solve problems encountered with conventional 4-wire switched network back-up.

Suppose a line failure occurs at point (A) on the leased line of the multipoint network shown in the figure. Transmission between the Control Station and Remote Station 1 should be made possible without disturbing the normal traffic with Remote Stations 2 and 3. For that purpose, two back-up tributary modems (2 and 3) are provided for connecting the leased line at the output of the Control Modem to the Remote Station 1 through a 4-wire switched network link. Connections are established between modems 2 and 3 so that the Receive Clock port of modem 2 is connected to the External Clock port of modem 3. Also, the Receive Data port of modem 2 is connected to the Transmit Data port of modem 3, and vice versa. Once failing line (A) has been localized, the switched network back-up connection is established. The set of two modems 2 and 3 behave like a repeater. Once the new configuration, including the back-up path, is established, the data traffic on the multipoint network may be re- established as initially.

In addition, logic may also be provided for automatically establishing the back-up path without any operator intervention.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]