Thanks escheider!
But this leaves 2 of the 4 pairs doing nowt! Is there a reason for this wastage
I am assuming that cat 5 cable has 4 lots of twisted pairs?
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what does 10baset mean?
Hi guys,
Just wondering re a few simples questions.
10baseT what does this mean? 10 mbps, baseband transmission, what does the "T" mean?
In 10base2, i am sure the 2 means 200 metres distance (well 185 exactly)
Also in UTP Cable Cat 5, why is there only 2 of the 4 pairs used? surely using them all will greatly improve bandwith? ie one pair for transmission and the other pair for receive. Still have 2 pairs left!
Thanks!
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Answers
This is a good page if you are interested
http://www.helmig.com/j_he
Hi,
ATM used all the pairs, i think.
The basic thing about CAt5 is that 4 pairs are produced for different reasons.
Cat 5 is supposed to provide a medium for several connection types, and yes, Cat 5 is supposed to provide a line speed of 100 mbs, but, serial type comms can generally run across it with line adapters.
1) Cat 5 is supposed to be compatible with other jacks, that use the middle 2 pairs, for phone generally.
2) Cat 5 is also used for serial links, as noted above, with additional converters. These generally can use upto 8 wires.
3) Cat 5 can be used for video, etc, the whole Idea of Cat 5 was to provide both 100mbs links, and conversion of older type connections into a common wiring scheme.
Hence, you can use twinax converters, RG59, 10base2 (with a balun) etc, over the same wiring.
You can also (in certain scenario's) use Cat 5 for 1000 mbs connections, as it depends upon line length, and data compression. AT&T developed one of the 1st Gigabit solutions, which actually ran at a line speed of 33mhz, well within the criteria for Cat 5.
Cat 5e, and Cat 6, are somewhat disputed in certain circles, as they could be construed as manufacturer 'upgrades' and designs, as opposed to EIA and IEEE type standards.
The original Cat 6 implementation was of german design, and involved a completely different socket and connector, as was IBM's 1st attempt.
As for Cat 7, any EIA/TIA docs supporting it would be welcome.
D
fallen asleep yet?
Oh, just for fun I'll weigh in with a couple more tidbits.
The orange and green pairs are used to conduct data.
Dylan touched on this point: the blue pair is there to allow the jacks to be used for phone communication as well. This is also why the green pair is split apart... so that the blue and green pairs can carry phone signals.
The brown pair is there for expansion purposes. Frequently companies will use this pair to connect to a single-pair telephone jack in the same faceplate as the data wire.
The current 100mb standard is CAT5 cables running 100BaseTX. However, for a brief period, the 100BaseFX standard looked very promising as it provided 100mb over CAT3 wiring using all 4 pairs of wires. It never really caught on, however.
Likewise, some gigabit implementations have required all 4 pair. I'm not knowledgeable enough about that market to know if that's the norm or the exception at this point.
Okay, now I've put myself to sleep... ;)
Also it is possible to use one cat5 cable to connect two computers to a remote Switch or hub. You can buy "splitters" which you put in both end of the cable, and then it can transfer two connections in one cable. It is simply using the two unused pairs for the second computer. I have seen this work with both 10 Mbit and 100 Mbit.
I love learning here. :-)
gregmcse got me even MORE curious. Does anyone know what the OFFICIAL color arrangement of the cat 5 wires is supposed to be? I was taught incorrectly at first and in my research, I have seen a few different configs. I currently use:
o/w | o | g/w | bl | bl/w | g | br/w | br
The other configs I have seen simply swaps the green and orange wires or changes from the striped to the solid first across the board. Since gregmcse states these are data wires anyway, I presume that doesn't matter much.
If incorrect, is this at least acceptable in the industry? If the standard is not adhered to, what could happen? I guess, there is a REASON for this arrangement. Anyone know why?
I just realized this should probably be posted as a question but I didn't want to lose the thread. I'll toss a few points out there to someone with a good answer for me. :-)
To distribute points , there are a number of options.
1) Lower the amount of points on this question, and then use the accept comment as answer for one person. The next step is to create a question for each other person with the amount of points you want them to have. The name of the person should be in the subject - something like " points for xxxxxx " . That person then answers the question and gets the points.
2) You can put in a request to
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This is especially true when you think you have received good information from more than one person.
I hope this helps !
It will still be open for comments, when it is closed, but only to people who participated in the question.
Gmichael: Take a look at this page.
http://www.netspec.com/hel
Well, yet another penny's worth...
There are two types of wiring configuration, and they are classed as TIA 568a and b
in one configuration, pins 1&2 are used by the W/O O pairs, and in the other, W/G G pairs are occupied on pins 1&2 of the RJ plug.
I believe it is tradition that the UK uses the TIA 568a wiring, and the US the b wiring, although that was a long time ago. Also, in the UK, they can be refred to as 258a and b, dependant upon the designers of the equipment you use. Best you don't mix them up tho, unless you want a lot of cross-over cables
(Thats how you create a cross-over cable, reverse the orange and green pairs)
=O]
I guess the above is just a case of being awkward.
you outta post a question about STP cabling, and grounding effects.... that'd go on for months...!
D
gmichels:
The wiring pattern you have just indicated:
w/o | o | w/g | bl | w/bl | g | w/br | br
(pins 1-8 from left to right)
is the 568b standard -- it is pretty much universally used in the United States as THE standard for twisted pair wiring.
The standard works out nice for phone and data. The biggest reason to adhere to it is sanity. When you go into one wiring closet, you don't want to have to guess what order your connections in the other closet use.
gmichels & dbrannigan: You're both very welcome. As a guy who has had to rip out and replace just about every wiring job he's ever encountered, I've developed an extreme desire to assist others... :)
As a tip to all, you'd be amazed how easy life can be if you run 3 wires instead of one or two to each workstation. It's pretty much the same amount of work and while it's more wire and jacks, wire and jacks are cheap compared to labor.
I usually run a "grand slam" (actually, I have others run it for me now) to new jack locations. 3 wires to 4 jacks in the following configuration:
Two "full" RJ-45 jacks -- a 4 pair wired per 568b and color-coded with a black (or other dark color) jack. The jack is fully wired so it can serve almost any major purpose for an RJ-45.
One "dual" RJ-45 jack -- a 3 pair wired per 568b with the brown pair missing. This allows both data (10Base-T & 100Base-TX) and voice (blue pair in middle) to be carried on the jack. Usually I color-code this one as red, though it would also make sense to color-code it as yellow.
One "phone" RJ-11 or RJ-45 jack. Carries a single pair -- the brown pair split off from the "dual" jack wiring. Only the middle-most pins are wired, and it's strictly for a single-pair phone solution. This jack should be white or off-white.
You would be AMAZED how well this works for almost everything. 3 wires, 4 jacks, capable of carrying any of these combinations:
4 phone
3 phone, 1 data (all 4 pairs)
2 phone, 2 data (all 4 pairs)
1 phone, 3 data (two with all 4 pairs)
This solves most problems for software developers as they almost always need one data jack for their main PC and a phone jack but frequently they might need another couple network connections (developers never listen when you tell them they don't need 3 PCs in their office) or they might need a pair of analog phone lines to do some dial-out testing, or ... well, you get the point. :)
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by: escheiderPosted on 2000-09-22 at 04:20:48ID: 4400819
>Also in UTP Cable Cat 5, why is there only 2 of the 4 pairs used?
1 pair is used for transmission and 1 pair is used for receiving.
>In 10base2, i am sure the 2 means 200 metres distance (well 185 exactly)
Correct
>10baseT what does this mean?
10Mbps Baseband Twisted Pair