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John,

The signals travelling in your cable are balanced in nature. Unbalanced signals (such as noise) are
cancelled at twist "nodes" in the cable. As long as the pairs of balanced signals from your
equipment is transmitted down a twisted pair (and not 2 conductors on different pairs), then the
performance should be fine)

Personally, I would adhere to the colour convention to save having to figure out which terminal
pairs connect to which twsited wire pairs.


Refer to : http://www.incentre.net/incentre/frame/ethernet.html for convention.



Kind Regards
David Huisman (CEO)
Orbit Communications Pty Ltd
Wireless Solutions that Work
Ph: +61-2-4393-3627
Fax: +61-2-4393-3685
Web: www.orbitcoms.com

----- Original Message -----
From: john chung
To:            PICLIST@MITVMA.MIT.EDU
Sent:         Mon, 29 Mar 2004 12:19:25 +0800
Subject: Re: [OT:] Serious network problem

Wrong pairing? Do you mean the order of the wire must follow the exact
specification
of cat 5e? I always believe that all the wire electrical characteristics
are equal?

here is the order of wire for my network cable

1st jack
1)white + orange
2)orange
3)white +green
4)blue
5)blue + white
6)green
7)white + brown
8)brown

2nd jack
1)white + orange
2)orange
3)white +green
4)blue
5)blue + white
6)green
7)white + brown
8)brown



John



Anand Dhuru wrote:

>>3. If connection is right, likely the twist pair is wrong.  You need to
>>
>>
>have
>
>
>>the twisting right, else the noise-effect of long cable would become a
>>problem.  This caught me, once or twice.
>>
>>
>>
>>>the floor's switch located in the server room. *The cable tested okay
>>>for connectivity when using a
>>>multimeter *
>>>
>>>
>>>
>
>This does indeed indicate a wrong pairing. Electrically (from a DC
>viewpoint) if the cable is as per specs, and yet does not work reliably, it
>*must* be the pairing. Also, if you have crimped the ends yourself, make
>sure the twisting is intact right upto the point the cable enters the RJ45
>plug.
>
>Regards,
>
>Anand Dhuru
>
>
>
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