CAT5 Cabling question

[Wombat]

SComp,
There's nothing to invite.

Mike,
I might be completely off, but I thought 100base used more signal lines than 10base.

[SCompRacer]

BS.

[Greebe]

D'oh! you're correct 4 pair

[Colin Morey]

For audio, you're best crossing cables at right angles, because of the twisted nature of the CAT5 cable this is v. difficult to achieve.

CAT5 only use 4 cores, numbered from top to bottom of connector 1,2,3,6.

Cat5 itself is a buch of mechcanical and electrical sepcifications for (not least) crosstalk at 30Mhz,60MHz, and 100MHz.

If you're talking CAT5e, for gigbit, that's a whole new kettle of fish.

It might help to check out this site
<a href=http://www.cableu.net/>Cable U</a>
C.

[SteveC]

Thanks for all you help guys!
Looks like I'll separate the cables just to be sure...

PS: Found this:

<font face="Verdana, Arial, Helvetica" size="2">
If 10BASE-T data networking only uses two of the four pairs in a CAT5 cable can the other pairs in cable be used for an additional 10BASE-T data channel or carry two telephone lines?
Nope, at least not according to standards. The other pairs are set aside for networks that need 4 pairs (two fast ethernet standards that never became popular and GBE). Crosstalk between the two systems can cause problems. Telephone, especially POTS (plain old telephone service), causes problems because of the crosstalks too - remember a ringing pulse is 90V!
</font>

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Cheers,
Steve

"Life is what we make of it, yet most of us just fake"

[SteveC]

Also,

<font face="Verdana, Arial, Helvetica" size="2">
The customer wants us to put the cat 3 and cat 5 cables/jacks in the same quad outlet as his 120vac outlets. my initial reaction is to advise him against this but i have no data to back up my decision. can you tell me if there are any specs on the proximity of these types of systems and what type of emi to expect or where to find the data i'm looking for?

The National Electric Code Sec. 800-52 specifies that communications
cabling cannot occupy the same raceway or enclosure with power
conductors. Furthermore there must be at least 2 inches separation
betweem comm. cables and power conductors.
</font>

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Cheers,
Steve

"Life is what we make of it, yet most of us just fake"

[xortam]

Cat 5 consists of four pairs of wires. The network protocols (physical, MAC) dictate which signals are used of those four pairs. 100Base-TX networks do indeed use two pairs vs. all four: Colin's reference bears this out. The point is somewhat moot if you're cabling your house as you want to run all four pairs to allow the flexibility of running multiple circuits (four voice, two RS232, etc.) or multiple networks (non-standard) and supporting higher speed networks. I implemented EIA/TIA 568 A to distribute from my DSL hub. You should really look at the structured wire installations for greater flexibility. GBE (Gigabit Ethernet) is here and will become much more purvasive this year and next. You'll be able to have access to networked storage at a nearby storage farm via GBE and it will perform like your local high speed HDDs. Exciting things are happening. Look at what the SAN industry is doing (iSCSI, SoIP, fibre-GBE gateways and switches).

[Greebe]

Maggi and Hellmood have GBE at www.VCC.de and as far as Maggi claims GBE out proforms his local HDD's by quite a bit!

[Jorden]

<font face="Verdana, Arial, Helvetica" size="2">GBE (Gigabit Ethernet) is here and will become much more purvasive this year and next.</font>

Will you stop it, xortam? I just made 3. Each about 25 meters (75ft) long, and had to cap them with ordinary RJ45 connectors. I also made ordinary CAT5.5 cables, capped them with their connectors. It's real fun working 1st and 2nd line support at the Sony Helpdesk

To get back to Steve's orginal question about CAT 5 cable interference from a mains cable?
It should not happen, for UTP cable had a steel wire shielding around it that absorbs interference from mains and TL-lighting. My CAT 5.5 cables (2) at home run right over the mains cable to the other side of the PC-room. No interference in sending stuff, nor in ICS. Might be because the mains cable laid down is a new version as well, heavily shielded.

Just to let you know, Steve.

Jord.

[SteveC]

Err Jorden - UTP - UNsheilded Twisted Pair.... this cable isn't sheilded from anything!

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Cheers,
Steve

"Life is what we make of it, yet most of us just fake"

[Jorden]

Inbetween a couple of reposts and I got it wrong agains, Steve and I came up with that I meant STP cable, instead of UTP cable

Jord.

[Ali]

I replied to this yesterday, and was the 3rd post down, now my post has gone!
What happened there?

Ali

[Greebe]

must have been lost in the ether

[SteveC]

net

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Cheers,
Steve

"Life is what we make of it, yet most of us just fake"

[Ali]

The strange thing is I waited until UBB forwarded me on, and the post was visible then.

If it had never been visible, then I wouldnt worry about it.

Still, looks like everything I said has been siad again, so it doesnt matter, just interesting.

Ali