公开(公告)号：DE69017142D1

公开(公告)日：1995-03-30

申请号：DE69017142

申请日：1990-10-09

Applicant: IBM

Inventor： GEYER JOEL ERWIN ,  LEE JOSEPH KIRMAN ,  WILSON KENNETH THOMAS

IPC: H04L12/433 ,  H04L12/42

Abstract: A method for enabling the transmitter to decide the number of variable length frames that can be transmitted within the token holding timer window. The last frame decision algorithm enables the transmitter to set the intermediate frame bit in the ending delimiter to the right state to indicate the status of each frame in the transmitted frame sequence. A look-ahead technique is used to check the remaining transmit time available in the time window, and therefore, no ring bandwidth is wasted on partially transmitted aborted frames, effectively optimizing the throughput of the network. Since key variables in the last frame decision algorithm are software programmable, the algorithm is independent of ring speed. The algorithm counts transmitted octets instead of measuring transmission time in deciding whether to transmit an additional frame. The algorithm can be applied to either single frame or multiframe transmit mode and to either normal or early token release. It is applicable to both the IEEE 802.5 local area network standard for token ring networks and the ANSI X3T9.5 standard for FDDI.

公开(公告)号：DE69017142T2

公开(公告)日：1995-08-10

申请号：DE69017142

申请日：1990-10-09

Applicant: IBM

Inventor： GEYER JOEL ERWIN ,  LEE JOSEPH KIRMAN ,  WILSON KENNETH THOMAS

IPC: H04L12/433 ,  H04L12/42

Abstract: A method for enabling the transmitter to decide the number of variable length frames that can be transmitted within the token holding timer window. The last frame decision algorithm enables the transmitter to set the intermediate frame bit in the ending delimiter to the right state to indicate the status of each frame in the transmitted frame sequence. A look-ahead technique is used to check the remaining transmit time available in the time window, and therefore, no ring bandwidth is wasted on partially transmitted aborted frames, effectively optimizing the throughput of the network. Since key variables in the last frame decision algorithm are software programmable, the algorithm is independent of ring speed. The algorithm counts transmitted octets instead of measuring transmission time in deciding whether to transmit an additional frame. The algorithm can be applied to either single frame or multiframe transmit mode and to either normal or early token release. It is applicable to both the IEEE 802.5 local area network standard for token ring networks and the ANSI X3T9.5 standard for FDDI.