Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Optimized Full Duplex Ethernet

IP.com Disclosure Number: IPCOM000114350D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Allen Jr, JJ: AUTHOR [+2]

Abstract

A method for increasing the network performance of full duplex Ethernet is disclosed. Increased network performance is achieved by eliminating the minimum frame size and inter packet gap requirements for full duplex Ethernet.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Optimized Full Duplex Ethernet

      A method for increasing the network performance of full duplex
Ethernet is disclosed.  Increased network performance is achieved by
eliminating the minimum frame size and inter packet gap requirements
for full duplex Ethernet.

      Full duplex Ethernet as currently implemented is not optimized
for performance and efficiency.  The current implementations are
based on products that also operate in CSMA/CD mode.  While these
implementations eliminate collisions, some of the other constraints
of CSMA/CD still exist.  These constraints reduce the performance and
efficiency of full duplex Ethernet.  For CSMA/CD, collision detection
and maximum network span requires a minimum frame size and an inter
packet gap.  Increased network performance can be achieved if the
minimum frame size and inter packet gap requirements are eliminated
for full duplex mode.  In Ethernet systems, any improvement in
performance is considered significant.

      CSMA/CD Ethernet is a shared media local area network.  Based
on the requirements for collision detection and maximum network span,
a minimum frame size and an inter packet gap is specified in the IEEE
802.3 Standard.  CSMA/CD Ethernet requires a minimum frame size of
512 bits (64 bytes).  If the data to be transmitted does not provide
a frame size of at least 512 bits, padding is used to increase the
frame size to 512 bits.  CSMA/CD Ethernet also requires an inter
packet gap of 9.6 micro seconds.  The inter packet gap provides a
period of inactivity on the network suc...