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Method to Increase Performance of IBM PC Network SNA 3270 Emulation Programs

IP.com Disclosure Number: IPCOM000061220D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Luo, CY: AUTHOR [+2]

Abstract

IBM PC Network SNA 3270 Emulation Program is a software package which allows the Personal Computer to emulate a 3274 control unit with an attached 3278/3279 display and a 3287 printer in varying configurations facilitating stand-alone and network operation. This product attaches to a host using SDLC/SNA protocols. The configurability and communications capabilities of a PC Network 3270 makes it usable and adaptable to many situations. All previous IBM PC SDLC products have run at a maximum speed of 9.6K baud. This speed is slow when compared to the speeds at which data is carried across the PC Network 3270 LAN. The gateway PC which will maintain the SDLC link when running in a network environment may have up to 32 other PCs communicating with it simultaneously.

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Method to Increase Performance of IBM PC Network SNA 3270 Emulation Programs

IBM PC Network SNA 3270 Emulation Program is a software package which allows the Personal Computer to emulate a 3274 control unit with an attached 3278/3279 display and a 3287 printer in varying configurations facilitating stand- alone and network operation. This product attaches to a host using SDLC/SNA protocols. The configurability and communications capabilities of a PC Network 3270 makes it usable and adaptable to many situations. All previous IBM PC SDLC products have run at a maximum speed of 9.6K baud. This speed is slow when compared to the speeds at which data is carried across the PC Network 3270 LAN. The gateway PC which will maintain the SDLC link when running in a network environment may have up to 32 other PCs communicating with it simultaneously. The performance of the SDLC link to the host will certainly impact the performance of the entire network. The capabilities of the SDLC card must be used to a greater extent to support the LAN environment in a more efficient manner. In accordance with the improved method, the SDLC code used on PC Network 3270 is structured to increase the speed of the communications link. There is no hardware change necessary for the PC or the SDLC card. The software strictly uses the hardware capabilities to a greater extent by the following changes. First of all, code was designed to work around a few hardware problems encountered with the SDLC...