H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 1/20 (2006.01) H04L 1/00 (2006.01) H04L 12/26 (2006.01)
Patent
CA 2317912
A method and communications device for controlling the line rate used on a communications link. The method includes receiving frames of digital information, computing a measure of the number of frames received in error in a sliding time window and generating a command to change the line rate as a function of the measure. The use of a sliding time window captures variations in the line quality over an extended period of time; thus, significant disturbances which might otherwise be missed are captured. The measure of the number of frames received in error is computed by applying a many-to-one mapping to the actual number of frame errors received since a previous sampling instant; thus, insignificant short-term disturbances which might otherwise temporarily corrupt the line quality estimate are eliminated. As a result, commands to change the line rate are based on a better estimate of line quality and the incidence of thrashing in the presence of recurring noise bursts is reduced, leading to increased data throughput. A back-off timer may be used for preventing an upgrade in line quality from occurring immediately following a downgrade, further decreasing the incidence of thrashing.
Alb Cristian
Matuszewski Jerzy
Slonosky Michael J.
Taylor Thomas P.
Nortel Networks Corporation
Nortel Networks Limited
Smart & Biggar
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