System and method for improving 3270 data stream performance by reducing transmission traffic
US5649101A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Dec 8, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L49/90
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improved 3270 data stream architecture to eliminate data bytes in the 3270 data stream to improve line utilization and reduces network costs. First, a 6-bit increment option has been added to the addressing options for the buffer control orders to reduce the number of address bytes in the set buffer address (SBA) order, repeat to address (RA) order, and the erase unprotected to address (EUA) order. Second, a reduced Start Field (SF) and repeat to address (RA) orders are implemented with utilizing a modified Set Attribute (SA) order to designate the field attribute character and repeat character. The SF and RA orders following the SA order in the data stream are reduced in length. Third, a Modify Existing Format has been implemented which provides a means of modifying a format load that is currently in the format storage of the outboard device without having the host application program resend the entire format when only a small portion of the format needs to be modified. Specifically, the Load Format Structured Field has been modified to add the modify existing format fields to modify specified portions of the Load Format Structured Field without having to retransmit the entire …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.