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Polling Technique for Determining Session Status on the IBM PC Network

IP.com Disclosure Number: IPCOM000060295D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Pekowski, RP: AUTHOR

Abstract

A method is described to permit a "Gateway" and a Network Station on the IBM PC Network to accurately maintain the IBM PC Network session status. IBM PC Network SNA 3270 Emulation Program is a program product that provides 3720 emulation for Personal Computers (PCs) connected together on the IBM PC Network. One PC acts as a "Gateway" to the host computer through an SNA/SDLC communications link. Other PCs, called Network Stations, are logically connected to the "Gateway" PC through IBM PC Network sessions. The "Gateway" and the Network Station, among other things, maintain the IBM PC Network status of their logical connections on the Network. For example, if a Network Station powers off or ends the Communications Task, the logical connection becomes inactive and the "Gateway" is informed of this.

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Polling Technique for Determining Session Status on the IBM PC Network

A method is described to permit a "Gateway" and a Network Station on the IBM PC Network to accurately maintain the IBM PC Network session status. IBM PC Network SNA 3270 Emulation Program is a program product that provides 3720 emulation for Personal Computers (PCs) connected together on the IBM PC Network. One PC acts as a "Gateway" to the host computer through an SNA/SDLC communications link. Other PCs, called Network Stations, are logically connected to the "Gateway" PC through IBM PC Network sessions. The "Gateway" and the Network Station, among other things, maintain the IBM PC Network status of their logical connections on the Network. For example, if a Network Station powers off or ends the Communications Task, the logical connection becomes inactive and the "Gateway" is informed of this. Similarly, if a "Gateway" powers off, the Network Station is informed. The IBM PC Network has no direct facility for immediately reporting when a logical connection, called a session, becomes inactive. Instead, the next time data is attempted to be sent on an inactive or aborted session, the sender is notified with a return code. On a "Gateway," data is generally only sent when a request is made to the Network Station. On a Network Station, data is generally only sent when a request is made through some key sequence. This is unacceptable, since situations could arise where the session status is incorre...