How many pins/wires does cat5 need to transmit data? If it's not all 8, which ones doesn't it need?
Cat5 Pin Question
- Thread starter TheBoyBlunder
- Start date
Follow the standards and use all 8, don't try to run cable tv or two cables in one, etc 
Thats said 100baseT runs over 2 pairs, and I believe specifically thats 1,2,3,6
don't forget 1000baset takes all 4 pairs, so think of the future if nothing else
Thats said 100baseT runs over 2 pairs, and I believe specifically thats 1,2,3,6
don't forget 1000baset takes all 4 pairs, so think of the future if nothing else
Also, make sure that you follow the pin diagrams. Making sure each wire is connected to the same pin on both ends is NOT GOOD ENOUGH. Cat5 is rated for 1" of untwisted wire over the whole run. From expirence, if you just go by "pin to pin", after 10 feet you start loosing throughput, and after 50 your signal is unreadable. Also, plan ahead. Not connecting the unused paris is a great way to cause a headache in 5 years or so when you can't figure out why a wire just won't work.
-Chu
-Chu
Oh I was just wondering how many pins cat5 uses for data. The idiot electrician who installed my network thought that Cat5 doesn't need all 8 pins to transmit data. (He also thought that you could share a dsl connection over multiple computers with no router or NAT box of any kind...I'm thinking about filing a complaint with the BBB) This was just to settle a bet. Thanks everyone.
I'm not completly shocked that an electrician would think it was possible to share DSL w/o a router . . . after all his job isn't really to know how DSL works, just to get it there. About the 2/4 pair thing though ... if you were running your own wires that would be one thing, but there is zero excuse for advice that is so blatently wrong with an electrician, I would be tempted to report him.
-Chu
-Chu
I'm probably going to report the moron. The guy designed a network like this:
Data and Voice come in from the phone company and get shared, throughout the house, by a standard patch panel in my garage.
Each port could have a data or a phone cable plugged in. There would be no NAT of any kind, no filters and no dsl modem plugged into the network. Everything would just magically work.
If that's not incompetent, I'm not sure what is.
Data and Voice come in from the phone company and get shared, throughout the house, by a standard patch panel in my garage.
Each port could have a data or a phone cable plugged in. There would be no NAT of any kind, no filters and no dsl modem plugged into the network. Everything would just magically work.
If that's not incompetent, I'm not sure what is.
He is an electrician, not a network/IT person. I'm surprised you had the balls to ask him anything about anything other than just the cabling. When we have people put in cable, they put in the cable to spec and that is it -- it's not their job to know how the cable comes together to form a network or anything at all other than "cable a goes from here to here"; knowing all the particulars is the job of the network person.
Don't report him to the BBB -- what if you showed up at work, and someone asked you a question about something you're not certain of, and to not look like an idiot you gave him your best answer (wrong as it may be) -- would you like a black mark on your record for trying to help someone out?
Let people do their jobs - if they do what they're supposed to do and don't screw anything else up, kudos.
randal
*a strong supporter of the "Just do *your* job" committee.
Don't report him to the BBB -- what if you showed up at work, and someone asked you a question about something you're not certain of, and to not look like an idiot you gave him your best answer (wrong as it may be) -- would you like a black mark on your record for trying to help someone out?
Let people do their jobs - if they do what they're supposed to do and don't screw anything else up, kudos.
randal
*a strong supporter of the "Just do *your* job" committee.
randal - he never said he didn't know about computers. He never said he was just guessing, he said he knew precisely how to do it. He said it would work flawlessly. Obviously, it hasn't. That is why I'm thinking of reporting him.
If someone showed up and asked me a question about something I'm not certain of, I'd tell them my best guess but say "I don't know for sure. I would reccomend you talk to (insert much more qualified person here) to be sure." I would not tell them my best guess and then never say "I don't know for sure".
If someone showed up and asked me a question about something I'm not certain of, I'd tell them my best guess but say "I don't know for sure. I would reccomend you talk to (insert much more qualified person here) to be sure." I would not tell them my best guess and then never say "I don't know for sure".
ahh, my bad. I presumed that electricians wouldn't fool around with networking ... because ... they are electrecians.
randal
*still a fan of "just do your fscking job" club.
randal
*still a fan of "just do your fscking job" club.
If I may toss in my two cents:
Your post isn't real specific, so if I'm guessing wrong, don't get all itchty.
Are you saying he made one run to each room home-runned (word?) back to a panel in your garage. For each run of cable, you get to choose whether it's gonna be voice or data?
If that's the case, then his only "crime" is not running enough cable (two runs is standard for most installs).
He should also have ran all of the coax back to the same location for video / BB cable distribution.
At least one run of each to the demarcation point of your home for Cable TV and Phone (the grey box on the outside wall - the "NID")
You can run a network without a router or NAT. You put in a switch or hub and get addresses for all your computers from the ISP. Not a great idea from a security point-of-view, but certainly doable.
There are more and more electricians being trained (in a Union course) on the standards and rules for pulling network cabling. They still may not be the best people doing it, but for those that are trained, they generally do a better job than a novice home user stringing their own. Most home users don't know that there are rule for how hard you can pull (stretch) the cable, what the minimum bend radius is, that there's a correct pair-order, exposure rules, types of connectors, etc.
Most electricians ARE used to installing according to a set of rules (like "The Code"). If someone tells them in a class that "This is the way you should do this" - then that's the way they do it. They are also (in many/most cases) also familiar with the "other" rules for running cables (like "The Code") to keep the installation safe.
The other factors here are who pays when something goes wrong. Most electricians are insured and bonded; meaning, if they screw something up, they gotta pay to fix it (or have it fixed). If the home user screws something up, then he's on the hook for the repair.
There are plusses and minuses for both sides, there are really good and really bad electricians (for power or data). If you have a choice, find someone that is an RCDD certified installer, or at least has an RCDD on staff to review the installation plan. RCDD is a certification from BICSI and a very hard test to pass (in the neighborhood of a CCIE for cable design).
Again, your guy may have been a "wire is wire" kinda guy; many / most electricians these days have come up to speed on data cabling. I personally know a few of 'em, I'd trust 'em to do my cabling.
FWIW
Scott
Your post isn't real specific, so if I'm guessing wrong, don't get all itchty.
Are you saying he made one run to each room home-runned (word?) back to a panel in your garage. For each run of cable, you get to choose whether it's gonna be voice or data?
If that's the case, then his only "crime" is not running enough cable (two runs is standard for most installs).
He should also have ran all of the coax back to the same location for video / BB cable distribution.
At least one run of each to the demarcation point of your home for Cable TV and Phone (the grey box on the outside wall - the "NID")
You can run a network without a router or NAT. You put in a switch or hub and get addresses for all your computers from the ISP. Not a great idea from a security point-of-view, but certainly doable.
There are more and more electricians being trained (in a Union course) on the standards and rules for pulling network cabling. They still may not be the best people doing it, but for those that are trained, they generally do a better job than a novice home user stringing their own. Most home users don't know that there are rule for how hard you can pull (stretch) the cable, what the minimum bend radius is, that there's a correct pair-order, exposure rules, types of connectors, etc.
Most electricians ARE used to installing according to a set of rules (like "The Code"). If someone tells them in a class that "This is the way you should do this" - then that's the way they do it. They are also (in many/most cases) also familiar with the "other" rules for running cables (like "The Code") to keep the installation safe.
The other factors here are who pays when something goes wrong. Most electricians are insured and bonded; meaning, if they screw something up, they gotta pay to fix it (or have it fixed). If the home user screws something up, then he's on the hook for the repair.
There are plusses and minuses for both sides, there are really good and really bad electricians (for power or data). If you have a choice, find someone that is an RCDD certified installer, or at least has an RCDD on staff to review the installation plan. RCDD is a certification from BICSI and a very hard test to pass (in the neighborhood of a CCIE for cable design).
Again, your guy may have been a "wire is wire" kinda guy; many / most electricians these days have come up to speed on data cabling. I personally know a few of 'em, I'd trust 'em to do my cabling.
FWIW
Scott
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