100 Base-t Crossover

Cabling-Design.com FREE cabling and networking Helpdesk
 Question by Terry Gallaway posted 08 Aug 2000
 100 Base-t Crossover
What is the difference in 100 baseT and 100 base-T4 Crossover cable signals?
 Answer by Dmitri Abaimov posted 08 Aug 2000
Dear Terry:

The biggest difference is that 100BASE-T4 was intended to run over CAT3 (as well as CAT5) cables. Having limited cabling capabilities, the protocol was designed to overcome the lack of bandwidth availavle on CAT3.

That's why it needs all the four pairs to operate. It just splits 100Mbit per two channels of 50Mbit thus lowering bandwidth demand by the factor of two.

So the crossover is designed so that it connects 'transmit' signals from one end with 'recieve' on another.

100BASE-T4 crossover has two 'transmits' and two 'recieves'. 100BASE-T has only one of those.

Dmitri Abaimov, RCDD

Click here to see the expert's profile
Back to the current page of questions | Back to all the questions
Back to Cabling-Design.com HELPDESK | Ask your question
Residential Cabling Guide

Home Cabling Guide

Finally, an instantly downloadable book that saves you thousands in home improvement dollars! Enjoy living in 21st century technology-advanced home while increasing its selling value and competitive advantage on the real estate market. Whether your cabling is for home office or high-tech leisure, you can wire your home yourself or learn "wirish" to speak with your cabling contractors in their language!

Learn more ...