Browse Prior Art Database

Remote Power Control System

IP.com Disclosure Number: IPCOM000039343D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Imamura, K: AUTHOR [+2]

Abstract

In a data communication system using a Synchronous Data Link Control (SDLC) protocol between a host processor and remote controller(s) which controls terminal units attached thereto, the controller is provided with a remote power control feature so that it can be remotely powered on and off by the host processor without using any new commands. For powering the controller on, the host processor produces successive same commands of "Set Normal Response Mode (SNRM)" which is normally used to control the IPL (initial program load) under SDLC protocol. When the controller receives three of the SNRM commands at intervals of less than 30 seconds, the main power of the controller is turned on and, then, the IPL is started with the next SNRM command being received.

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Remote Power Control System

In a data communication system using a Synchronous Data Link Control (SDLC) protocol between a host processor and remote controller(s) which controls terminal units attached thereto, the controller is provided with a remote power control feature so that it can be remotely powered on and off by the host processor without using any new commands. For powering the controller on, the host processor produces successive same commands of "Set Normal Response Mode (SNRM)" which is normally used to control the IPL (initial program load) under SDLC protocol. When the controller receives three of the SNRM commands at intervals of less than 30 seconds, the main power of the controller is turned on and, then, the IPL is started with the next SNRM command being received. Also, the controller is responsive to the SNRM command received first after completing the IPL, to send the "Unnumbered Acknowledgement (UA)" command back to the host processor, thus completing the power on and IPL operations. If the interval for the successive SNRM commands is found to be not less than 30 seconds, the previously received SNRM command is made invalid. For powering the controller off, the host processor normally supplies a "Shutdown (SHUTD)" command to the controller to make it proceed with the power-off sequence.

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