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Data Terminal Equipment Remotely Powered by a Modem Equipped With a Contact Sense/Operate Facility

IP.com Disclosure Number: IPCOM000042498D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Vachee, P: AUTHOR

Abstract

This article describes how the unattended operation of Data Terminal Equipment (DTE) can be solved by giving control to a Remote Support Center which can first repower ON the DTE, then run diagnostics or perform an initial program load (IPL). This is done by using a modem powered by an autonomous power (battery, for instance) equipped with the Sense/Operate facility and a specific function (microcoded or not) which validates sense contact information by Data Terminal Ready (DTR) OFF in the V 24 interface, then initiates the call and sends the right message to the Remote Support Center. It is mandatory to validate the Sense contact information for at least two reasons: 1. The Sense/Operate facility or cables can be out of order. 2.

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Data Terminal Equipment Remotely Powered by a Modem Equipped With a Contact Sense/Operate Facility

This article describes how the unattended operation of Data Terminal Equipment (DTE) can be solved by giving control to a Remote Support Center which can first repower ON the DTE, then run diagnostics or perform an initial program load (IPL). This is done by using a modem powered by an autonomous power (battery, for instance) equipped with the Sense/Operate facility and a specific function (microcoded or not) which validates sense contact information by Data Terminal Ready (DTR) OFF in the V 24 interface, then initiates the call and sends the right message to the Remote Support Center. It is mandatory to validate the Sense contact information for at least two reasons: 1. The Sense/Operate facility or cables can be out of order. 2. An untimely power ON could damage the application program because electronic components (like memory, for instance) need DC sequencing; thus, a false powering, when power ON, could start DC sequencing and damage memory or other electronic parts. Remote powering sequence (see figure): 1. Sense contact sends to the modem a DOWN level (DTE DC power DOWN or Sense/Operate out of order). 2. An interrupt is sent to the modem microprocessor, and the validation step begins.
2.1. DTR OFF with Sense contact DOWN. A repowering is required, and so the modem calls (Auto-Call facility) the Remote Support Center, then sends a message to command a Remote p...