Problem in Cable installation
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Posted by James Knott on June 6, 2005, 4:28 pm
Please log in for more thread options Justin Time wrote: And what would the difference be between cables marked 568A or 568B??? Don't confuse marketing with specifications. Manufactures will often sell something for a specific use and use commonly misused terms to describe it. For example, how many times have you seen reference to "DB-9" serial port connectors, even though there's no such animal? (the proper term is DE-9) The cable has to meet CAT 5 specs, no matter how it's wired. The wiring should comply with 568A or B, though it's not necessary for proper operation, so long as proper pairing is maintained. | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Justin Time on June 7, 2005, 8:32 am
Please log in for more thread options James, You are still confusing the wiring pattern with the transmission specifications. Each version of the standard, from the original 568 through all the TSBs and addendums up through 568B has had a set of transmission specifications cable manufacturers must meet in order for the cable to be rated as Cat 3, Cat 4, Cat 5, Cat 5(e), Cat 6 and so on. The manufacturers are now stamping their cables with the version of the 568 standard they are compliant with. Thus, a cable stamped as meeting the 568B specs has better transmission charcteristics than a cable marked as 568 or 568A. You keep referring to the wiring pattern as 568A and 568B and then hold out the reference to a DB-9 serial port connector when the "proper" term is DE-9. Well, the proper term for the wiring pattern used on jacks and plugs is T568A or T568B, not 568A or 568B which denotes the ANSI/TIA/EIA standard. Rodgers Platt | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Justin on June 6, 2005, 7:08 pm
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Siva U. Shankar wrote: > Hi guys!
> > I have a serious problem. > > I've connected a 3com office connect 16 port switch like the following way > the netwotk is not working can u help me to figure out why? > > 3com office connect --> CAT5e 586A cable --> both end 586A wall socket > connected CAT5e cable --> straight through/ 586A cable --> to a winXP > computer > > when connected this way it says in the computer, repeats these two > messages. - network cable is unplugged/acquiring network parameters (This > message is contineously repeated on its own. There is no connected lite > indicater in the switch either. > > When i connect the computer direct to the 3COM office connect it works fine. > > Where is my mistake, I'm a new bie for cabling. Pls help me to sort it out. > Or suggest me a good website for me to refer.. > > Thanks in advance. > > Shankar > > We're I've seen this type of error, it usually indicates a wiring problem. Typically it's a split-pair (WH/BL with GR/WH, WH/GN with BL/WH) or a reversed pair (WH/BL pair swapped with the WH/GN pair). Since you mentioned on end is a Leviton that is label, and the other is unlabeled, I would only make changes at the leviton end as you can see what you've done. It start with swapping the WH/GN and WH/OR pairs to fix a 568A-at-one-end-568B-at-the-other problem (a cross-over patch cord at one end would also be a simple test before changing termination). With the link light at only one end, lends me to think that it's a split pair, and with the one end not having any indication for termination pattern, you may have to wait for your tester to trouble shoot further. Justin | |||||||||||||||||||||||||||||||||||||||||||
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> they are 568A or 568B, you need to understand that cables marked as
> 568A or 568B meet the transmission requirements published in that
> standard. You are confusing the standard with the wiring pattern.
> Check out this link I selected at random where it talks about
> applicable standards.