Data transmission system and interface module and priority...

Details Data transmission system and interface module and priority... Data transmission system and interface module and priority...

H - Electricity

04

L

H04L 12/56 (2006.01)

Patent

CA 2104492

- 21 - ABSTRACT DATA TRANSMISSION SYSTEM AND INTERFACE MODULE AND PRIORITY GENERATION MEANS INCLUDED THEREIN The interface module. e.g. LIM1, includes a priority generation module PG which determines a priority value PR1 of the module on the basis of which the module competes for access to a common data bus DB and this each time access to that the bus is granted via a grant signal transmitted over a priority bus AB. The priority value PR1 is also transmitted over AB and is determined dynamically based on at least one characteristic of the packet. e.g. on the age of the oldest byte of data packets waiting for transmission in the interface module and/or on the type of information contained in the packet. Two embodiments of PG are described, one based on a software program and one based on the counter value, at the receipt of the grant signal, of counters associated with each queued packet.

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