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Question on Ethernet

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Printed Date: 07Feb2025 at 11:50pm


Topic: Question on Ethernet
Posted By: manju
Subject: Question on Ethernet
Date Posted: 23Feb2007 at 4:57pm
 
 
 What is the relation between Jamsignal size and Minimum Frame Size in Ethernet(IEEE802.3) network?
 
 
 
Several key parameters of CSMA/CD are needed to work correctly.

First, there must be a carrier signal on the medium that other nodes can sense (thus the frame's preamble).

Next, the transmitting node must be capable of completely transmitting the minimum packet size and reliably detecting whether a collision has occurred. This minimum transmission time necessary to transmit the minimum packet size is known as the slot time. For 10Mbps and 100Mbps Ethernet, the slot time is 512 bit times, which not coincidentally happens to be the minimum length of an Ethernet packet (64 octets is 512 bits). For gigabit Ethernet, the slot time is 4096 bit times.
ollision detected procedure

1. Continue transmission until minimum packet time is reached (jam signal) to ensure that all receivers detect the collision
2. Is maximum number of transmission attempts reached? If so, abort transmission.
3. Calculate and wait random backoff period
4. Re-enter main procedure at stage 1
jam signal is the same slot time


Replies:
Posted By: balu
Date Posted: 23Feb2007 at 5:02pm
Several key parameters of CSMA/CD are needed to work correctly.

First, there must be a carrier signal on the medium that other nodes can sense (thus the frame's preamble).

Next, the transmitting node must be capable of completely transmitting the minimum packet size and reliably detecting whether a collision has occurred. This minimum transmission time necessary to transmit the minimum packet size is known as the slot time. For 10Mbps and 100Mbps Ethernet, the slot time is 512 bit times, which not coincidentally happens to be the minimum length of an Ethernet packet (64 octets is 512 bits). For http://forum.onestopgate.com/forum_posts.asp?TID=731&SID=b566c68e9f5z96b8c7b9b76a24e9e43e# - - Ethernet , the slot time is 4096 bit times.
ollision detected procedure

1. Continue transmission until minimum packet time is reached (jam signal) to ensure that all receivers detect the collision
2. Is maximum number of transmission attempts reached? If so, abort transmission.
3. Calculate and wait random backoff period
4. Re-enter main procedure at stage 1
jam signal is the same slot time




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