shielded cat 5e

[Heywood Jablome]

Hey all,

I have been looking everywhere for pink shielded cat 5 cable - either
stranded or solid core, around 25 metres.

All of the computer stores I have tried don't stock it. Middendorp
electrical stocks it but only in a 305m reel. Same as Hills. Anyone know a
supplier that sells by the metre or in low increments?

I really don't want a 305m reel. Its expensive stuff because it's shielded.

-H

 

[Allan]

Hey all,

I have been looking everywhere for pink shielded cat 5 cable - either
stranded or solid core, around 25 metres.

All of the computer stores I have tried don't stock it. Middendorp
electrical stocks it but only in a 305m reel. Same as Hills. Anyone know a
supplier that sells by the metre or in low increments?

I really don't want a 305m reel. Its expensive stuff because it's shielded.

-H

Why do you want Shielded Cat 5 Cable?
Do you not understand that Cat5 cable is a twisted Pair design, and does not
require shielding, and that shielding it would make no difference.
Iam curious what application you would need to have shielded Cat 5 cable,
Esp. over 25 Meters
Allan

 

[Defibrillator]

Why do you want Shielded Cat 5 Cable?
Do you not understand that Cat5 cable is a twisted Pair design, and does
not
require shielding, and that shielding it would make no difference.
Iam curious what application you would need to have shielded Cat 5 cable,
Esp. over 25 Meters
Allan

Hey Mr Expert, how about you try a little experiment before questioning the
OP's sanity?

Get a portable radio, switch to the AM band, tune off the station and hold
it near an active CAT5 UTP cable. Hear that noise? Now switch to FM and do
the same. Hear the noise? Got a Spectrum Analyser? Hold the probe near a
CAT5 cable and have a look at the crap that comes out. Now, is that cable
well shielded (NOT) and would shielding make a difference (YOU BET)?

In an electronics development environment, particularly RF-related, the crap
radiated by UTP cables can really screw things up.

I'm interested in the answer to the OP's question, and also whether/where
pre-made shielded patch cables are sold.

D.

 

[Heywood Jablome]

Hey Mr Expert, how about you try a little experiment before questioning the
OP's sanity?

Get a portable radio, switch to the AM band, tune off the station and hold
it near an active CAT5 UTP cable. Hear that noise? Now switch to FM and do
the same. Hear the noise? Got a Spectrum Analyser? Hold the probe near a
CAT5 cable and have a look at the crap that comes out. Now, is that cable
well shielded (NOT) and would shielding make a difference (YOU BET)?

In an electronics development environment, particularly RF-related, the crap
radiated by UTP cables can really screw things up.

I'm interested in the answer to the OP's question, and also whether/where
pre-made shielded patch cables are sold.

D.

I'm not after pre made patch cables. Just the cable itself. The application
is for a home automation lighting system. The shielded cable is used to
daisy chain all switches in the house. It is a Dynalite system that requires
shielded Cat5 cable. I am guessing that this is because it will be in close
proximity to 240V cable.

Anyway, I recall a company with the word cable in it like "the cable guys"
or "cable world" or something that stocked it by the metre. Anyone know a
source?

Cheers -H

 

[Russ]

I'm not after pre made patch cables. Just the cable itself. The
application is for a home automation lighting system. The shielded
cable is used to daisy chain all switches in the house. It is a
Dynalite system that requires shielded Cat5 cable. I am guessing that
this is because it will be in close proximity to 240V cable.

How does Dynalite compare to C-Bus?

 

[Defibrillator]

I'm not after pre made patch cables. Just the cable itself. The
application
is for a home automation lighting system. The shielded cable is used to
daisy chain all switches in the house. It is a Dynalite system that
requires
shielded Cat5 cable. I am guessing that this is because it will be in
close
proximity to 240V cable.

Anyway, I recall a company with the word cable in it like "the cable guys"
or "cable world" or something that stocked it by the metre. Anyone know a
source?

Cheers -H

Try Wiltronics - http://www.wiltronics.com.au/catalogue/shop.php?cid=71

 

[Heywood Jablome]

How does Dynalite compare to C-Bus?

C-Bus is easier to sell. Nice range of flashy buttons, and is easier to
program but Dynalite is more versatile in what you can do with each switch-
Most of the Dynalite range is used in industrial lighting control such as
bridges and monuments around the world, but they do have a small range for
home automation use. In terms of cost, they are much the same.

 

[Phil Allison]

"Heywood Jablome"

C-Bus is easier to sell. Nice range of flashy buttons, and is easier to
program but Dynalite is more versatile in what you can do with each
switch-
Most of the Dynalite range is used in industrial lighting control such as
bridges and monuments around the world, but they do have a small range for
home automation use. In terms of cost, they are much the same.

** How IS that lunatic John Gunton going these days ???




.............. Phil

 

[Allan]

Hey Mr Expert, how about you try a little experiment before questioning the
OP's sanity?

Get a portable radio, switch to the AM band, tune off the station and hold
it near an active CAT5 UTP cable. Hear that noise? Now switch to FM and do
the same. Hear the noise? Got a Spectrum Analyser? Hold the probe near a
CAT5 cable and have a look at the crap that comes out. Now, is that cable
well shielded (NOT) and would shielding make a difference (YOU BET)?

In an electronics development environment, particularly RF-related, the crap
radiated by UTP cables can really screw things up.

I'm interested in the answer to the OP's question, and also whether/where
pre-made shielded patch cables are sold.

D.

Hey Thanks for the Info,
So what's the difference b/t the shielded and non shielded cable with how
far away from the Cat 5 cable does the AM radio stop picking up the EMF
noise?
I'am not tiring to be a smart arse, I was just tiring to find out if he knew
why he needed the shielded cable, and if it would really make any difference
, which I see is still not answered here...

 

[Clifford Heath]

So what's the difference b/t the shielded and non shielded cable with how
far away from the Cat 5 cable does the AM radio stop picking up the EMF
noise?
I'am not tiring to be a smart arse, I was just tiring to find out if he knew
why he needed the shielded cable, and if it would really make any difference
, which I see is still not answered here...

Have you looked at the number of twists-per-inch of Cat-5e?
Adjacent half-twists radiate the same hash with opposite
phase, so you'll detect EMI more or less depending on whether
your detecter is "listening" to one half-twist or more at the
frequency of interest. When you get further away than the
length of N twists, or when you consider a frequency whose
wavelength is N twists or more, you'll pick up s.t. like 1/N^2
of the hash. Or 1/N^3, I forget. Either way, that's one reason
why Cat-6 has a higher bandwidth rating, more twists/foot.

 

[Heywood Jablome]

** How IS that lunatic John Gunton going these days ???




............. Phil

Do you know him?

 

[Phil Allison]

"Heywood Jablome"

Do you know him?

** Not in the biblical sense ;-0

Met up with him when he ran Ceitex back in the late 1970s - they carried
out the assembly ( badly ) of some audio mixers I had designed for a disco
hire business called Jai Sound.

Had some minor dealings with Dynalite - one of the staff there is a friend
of mine.





................. Phil

 

[Allan]

Have you looked at the number of twists-per-inch of Cat-5e?
Adjacent half-twists radiate the same hash with opposite
phase, so you'll detect EMI more or less depending on whether
your detecter is "listening" to one half-twist or more at the
frequency of interest. When you get further away than the
length of N twists, or when you consider a frequency whose
wavelength is N twists or more, you'll pick up s.t. like 1/N^2
of the hash. Or 1/N^3, I forget. Either way, that's one reason
why Cat-6 has a higher bandwidth rating, more twists/foot.

So does the shielding stop anymore EMI getting out?

 

[Newsy]

I'm not after pre made patch cables. Just the cable itself. The
application
is for a home automation lighting system. The shielded cable is used to
daisy chain all switches in the house. It is a Dynalite system that
requires
shielded Cat5 cable. I am guessing that this is because it will be in
close
proximity to 240V cable.

Anyway, I recall a company with the word cable in it like "the cable guys"
or "cable world" or something that stocked it by the metre. Anyone know a
source?

Cheers -H

H

I want some as well for a Dynalite installation.
I'm happy to take a box full.
Where are you?
How much do you need?

Rod

 

[Clifford Heath]

So does the shielding stop anymore EMI getting out?

Of course. It's not impregnable though - even the
shielding has a finite resistivity and inductance
which would allow some leakage. But the emisions
would be much less, especially at very high
frequencies (5GHz and up), where the wavelength
is short enough that those cancelling half-twists
don't cut it any more.

 

[Allan]

Of course. It's not impregnable though - even the
shielding has a finite resistivity and inductance
which would allow some leakage. But the emisions
would be much less, especially at very high
frequencies (5GHz and up), where the wavelength
is short enough that those cancelling half-twists
don't cut it any more.

Cool, Thanks Clifford,

 

[Heywood Jablome]

H

I want some as well for a Dynalite installation.
I'm happy to take a box full.
Where are you?
How much do you need?

Rod

I need about 25m. I'm in Melbourne. Where are you?

 

[Newsy]

I need about 25m. I'm in Melbourne. Where are you?

Adelaide, but that doesn't matter if you are willing to pay the postage.
Email me on rlg000ATNOSPAMyahoo.com
Take out the obvious.

Rod