Homemade cat5 cable using existing phone line fails.

>>
>> That's a telephone plug that's completely unsuitable for network use.
>> Do yourself a favor and go *buy* the patch cord you need, don't try to
>> make it yourself.

>
>This plug has 8 terminals that matches the exact dimensions to a normal cat5
>plug from what I'd measured using a precision caliper. If there is chemistry
>involve that makes this unsuitable for network use then what will it be?
>
>

The drawings in your PDF show too much untwisted wire to meet CAT5
spec. CAT 3 maybe, and it might work at 10MB.

Here's a pic. There's MUCH to MUCH untwisted wire.

http://www.systimax.com/pressroom/image_library/default.asp?img=39

Buy a real patch cable.

--
a d y k e s @ p a n i x . c o m

Don't blame me. I voted for Gore.

Posted by DecaturTxCowboy on March 12, 2006, 7:54 pm

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Sam Nickaby wrote:

> This plug has 8 terminals that matches the exact dimensions to a normal cat5
> plug from what I'd measured using a precision caliper. If there is chemistry
> involve that makes this unsuitable for network use then what will it be?

Look REAL close at the gold plated tines. If the two or three are
offset, then its for solid conductor. If the two are in line, its for
stranded cable.

Posted by Carl Navarro on March 13, 2006, 7:11 am

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>> >
>> > Here's the modular plug I used

http://support.avaya.com/edoc/docs/cib/cib28602.pdf

>>
>> That's a telephone plug that's completely unsuitable for network use.
>> Do yourself a favor and go *buy* the patch cord you need, don't try to
>> make it yourself.

Thank Eli Whitney for that.

A 4 pin handset plug will fit in the jack, so why don't you solder
that up and use it?

The particular plug you refer to was designed a long time before
Cat-5e was a standard.

It's O.K. In fact, rather than use any kind of standard, take you 8
conductors and put them down in any color sequence you like. Just
match them on the other end and check them with a "tester" for
continuity. If it works, you did a good job. If it doesn't you can
post to 4 usenet groups and then argue with the standards.

Oh, you already did.

Carl Navarro

Posted by Robert Redelmeier on March 13, 2006, 9:23 am

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>> > Here's the modular plug I used

http://support.avaya.com/edoc/docs/cib/cib28602.pdf

>>
>> That's a telephone plug that's completely unsuitable for network use.
>> Do yourself a favor and go *buy* the patch cord you need, don't try to
>> make it yourself.

>
> This plug has 8 terminals that matches the exact dimensions
> to a normal cat5 plug from what I'd measured using a precision
> caliper. If there is chemistry involve that makes this unsuitable
> for network use then what will it be?

The network "chemistry" is balanced signalling. It is the magic
that allowed clever network engineers to run 100 MHz over 100m
of wild country ten+ years ago when motherboard designers could
hardly get 50 MHz over 20cm on a PCB with unbalanced signals.

In this case, your plug has projections that may block other
ports or might not fit in the jack properly.

Less obviously, it has long parallel unbalanced conductors.
AKA "untwist". A crimped plug has about 1 cm of untwist.
This low-tool plug has at least 3 cm.

But this isn't as fatal as trying to run silver satin at 100 MHz.

-- Robert

Posted by on March 13, 2006, 2:13 pm

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>
> This plug has 8 terminals that matches the exact dimensions to a normal cat5
> plug from what I'd measured using a precision caliper. If there is chemistry
> involve that makes this unsuitable for network use then what will it be?

No chemistry, physics. There are *lots* of DC and AC electrical
properties that are every bit as important as the physical properties
for correct operation. Your plug is probably OK as far as the DC
properties, but there's no way it's going to come anywhere close to
meeting the AC properties required for a reliable 100BaseT connection.

-Larry Jones

Hmph. -- Calvin

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LAN and Telecom Cabling Homemade cat5 cable using existing phone line fails.