Newsgroups: comp.dcom.telecom.tech
Subject: Re: ethernet polarity
References: 
"TerryS"  writes:

> Are the signals on the two pairs polarity sensitive ? 


At least on 10 Base-T and 100Base-TX Ethernet system the 
parctical systems are not polarity sensitive. The Ethernet 
devices should be built in such way that they automatically 
correct the reversed polarity situation. 

> I never thought much 
> on this and I don't even know what the signals are. We are troubleshooting a 
> network with lots of packet errors. The customer has not noticed any 
> degradation yet, but our monitor keeps going into alarm. Anyway, we found 
> the green pair reversed, on the router to switch cable, but it must have 
> been for some time, and the problem is recent. This has been corrected, 
> cable tests out now. Not enough data yet to tell if that fixed it. Just 
> wondering.

Most propably your errors are caused by some other reason.



-- 
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at 
http://www.epanorama.net/