cabling

[preet]

Hi.
during cabling of cat5 cable what i know from my research is that the sequence is as followa orw/or/grw/blw/bl/g/brw/br on both connectors

but i have seen some patch cable with sequence as follows;

or/orw/grw/bl/blw/gr/br/brw on both connectors.

Is that feasible?

thanks.

[pangea33]

Typically the striped/solid matching pairs might get swapped, but you've got quite an illogical configuration going there. I suppose there is a chance that this sort of mixing and matching could result in a little interference, which might just translate into slightly reduced transfer speeds after error-correction does it's thing.

While wiring up cables in a way that differs from the specified standards is definitely not a good habit to get into, you're fine here. As long as the same color wires match up on both ends, you've got a straight-through cable that will work.

Cross-cables are different because the individual wires don't match on both ends. Did you buy that cable, or did someone put it together themself?

[Fruss Tray Ted]

Just to second Pangea here, as long as they are wired the same on both ends they should work fine.

If there is some standard which is supposed to be adhered to such as a legal code colorwise, I am unaware of it.

[pangea33]

It's not a legal code in the sense that you might fail an inspection because you're not up to code. It was a standard agreed upon by many major players in the telecommunications field, so that everyone was on the same page.

Since you've got to carefully "peep scene" on the wires anyway, I figure it's wise to do it like the standard they came up with.

http://en.wikipedia.org/wiki/TIA-568B
TIA/EIA-568-B was developed through the efforts of more than 60 contributing organizations including manufacturers, end-users, and consultants. Work on the standard began in 1985, when the Computer Communications Industry Association (CCIA) asked the Electronic Industries Alliance (EIA), a standards organization, to define standards for telecommunications cabling systems. EIA agreed to develop a set of standards, and formed the TR-42 committee, with nine subcommittees to perform the work.

RJ-45 pin-out for Cat 5 EIA/TIA-568-A
Pin Tip/Ring Color Pair
1 White/Green Pair 3
2 Green/White Pair 3
3 White/Orange Pair 2
4 Blue/White Pair 1
5 White/Blue Pair 1
6 Orange/White Pair 2
7 White/Brown Pair 4
8 Brown/White Pair 4

RJ-45 pin-out for Cat 5 EIA/TIA-568-B
Pin Tip/Ring Color Pair
1 White/Orange Pair 2
2 Orange/White Pair 2
3 White/Green Pair 3
4 Blue/White Pair 1
5 White/Blue Pair 1
6 Green/White Pair 3
7 White/Brown Pair 4
8 Brown/White Pair 4

[Erik]

The problem is not really so much with a small patch cable that you can look at both ends of and see how it should be wired or what kind of cable it is. It is when you have some cables running between floors and through walls and you need to rewire one end. If everyone just did there own thing it would be near impossible to get them done. If everyone knows TIA568B and follows it then it s a piece of cake.

[preet]

Hi.
The cable am referring connected to my livebox which gives me adsl connection and also tv programs. the cables runs from the live box to the decoder which is connected to my tv. well i was curious to see how the guy did the rj45 crimping and to my surprise the order which i learnt 586b was not there.

[pangea33]

I've been looking around about Livebox, and this is my take on it. This is a highly-proprietary multimedia/online service provided by Wanadoo. I envision an updated version of the old AOL or Compuserve. Evidently it allows you to get television, high-speed internet, and phone service, with some minor requirements. You have to buy high-speed internet AND a phone line through them. It won't work with any other ISPs, so they can raise their price whenever they feel like it. Around here high-speed Internet and programming, including free on-demand movies, over cable is about $70. If Comcast told me I had to add a $40/mo phone line in order to get....uhh, I can't see any added benefits, I'd give them a good hearty belly-laugh. I can't envision a time when I'll ever buy a landline again, or pay a monthly service fee on top of an already ridiculous price of more than $100/mo.

Oh sorry, got off track there. :-) My main point is that this is a highly proprietary service, so the cable used to connect those two proprietary devices is not a Cat-5 cable, even though it uses the familiar RJ45 connector. In fact, it might not even be an actual RJ45 connector. It's probably a similar proprietary plug that costs $11 if you break it. I can't tell you much about Livebox, other than the liklihood of me getting it approaches the limit of zero.

http://forums.broadbandbuyer.co.uk/search.asp?KW=livebox+cable&SM=1&SI=PT&FM=0&OB=1
http://forums.itweek.co.uk/thread.jspa?threadID=58182&start=15&tstart=0
http://zxon.notnet.co.uk/orange/

[Erik]

Also just because it is a standard doesn't mean everyone will follow it. I was doing a job with some electiricans and they did the RJ45s to whatever they happened to use (not A or B). Luckily they only actually crimped one cable so I rewired it to B.

If that is some proprietary device it can be done to whatever they like. It might be a true CAT5 or it might be something that looks kind of like a CAT5 but is really a whole nother animal.