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Browse Prior Art Database

MULTI-STATION BACKUP FOR MAIN/STANDBY

IP.com Disclosure Number: IPCOM000008622D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-27
Document File: 3 page(s) / 114K

Publishing Venue

Motorola

Related People

Peter Biancalana: AUTHOR [+3]

Abstract

The MAIN/STANDBY feature uses one station to "backup" another station in case of failure. The STANDBY station is required to have the contigu- ration information (Personality codeplug) identical to the MAIN station loaded prior to installation. Currently, the Conventional MAIN/STANDBY feature, as implemented in the Quantar station, uses a number of status lines on the 50 pin TELCO punchblock and Enhanced WildCard in a two station configuration. Each station uses WildCard to gather information on the other station's health; the information is passed between the stations using the status lines. The STANDBY station uses WildCard to assess the health of the MAIN station thru the status lines. When a failure occurs in the MAIN station, the STANDBY station changes its mode of operation from STANDBY to MAIN and thus provides backup for a single Conventional station. In large Conventional systems, where multiple channels are used, one station is used for each channel. If it is required to have a backup for all the channels, then each of the active stations in the system will require a dedicated backup station. This configuration becomes a very expensive fault- tolerance solution for large Conventional systems.

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MOTOROLA Technical Developments

MULTI-STATION BACKUP FOR MAIN/STANDBY

by Peter Biancalana, Joshua I. Siegle and Nathalie Berthelot

SYSTEM BACKGROUND

  The MAIN/STANDBY feature uses one station to "backup" another station in case of failure. The STANDBY station is required to have the contigu- ration information (Personality codeplug) identical to the MAIN station loaded prior to installation. Currently, the Conventional MAIN/STANDBY feature, as implemented in the Quantar station, uses a number of status lines on the 50 pin TELCO punchblock and Enhanced WildCard in a two station configuration. Each station uses WildCard to gather information on the other station's health; the information is passed between the stations using the status lines. The STANDBY station uses WildCard to assess the health of the MAIN station thru the status lines. When a failure occurs in the MAIN station, the STANDBY station changes its mode of operation from STANDBY to MAIN and thus provides backup for a single Conventional station. In large Conventional systems, where multiple channels are used, one station is used for each channel. If it is required to have a backup for all the channels, then each of the active stations in the system will require a dedicated backup station. This configuration becomes a very expensive fault- tolerance solution for large Conventional systems.

SOLUTION

  The proposed solution consists of providing one or more STANDBY stations to backup a large Conventional system. It also provides the means of automatically gathering the configuration informa- tion (Personality codeplug) of all the MAIN stations so that the backup station(s) do(es) not need to be loaded prior to installation.

With the addition of ethernet to the recent

Quantar Station Release, it is now possible to provide communication facilities between stations via a LAN. Using the LAN for a MAIN/STANDBY communication link> instead of the individual status lines, allows the STANDBY station to "dynamically" configure itself as the backup for any station it shares the LAN with. The use of the LAN elimi- nates the need for WildCard, which has a limited number of status lines...