Problem in Cable installation
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Posted by Siva U. Shankar on June 5, 2005, 2:15 am
Please log in for more thread options 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? 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 | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Dale Farmer on June 5, 2005, 7:00 am
Please log in for more thread options "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 Problem in the wall. Pull the plates off and reterminate the cables onto the jacks. Overwhelmingly likely to be a miswire on one of the jacks. Next runner up most likely cause is that the cables you think are connected in the wall are actually going someplace else. But since you imply you get a link light on the computer, you probably have a miswire. --Dale | |||||||||||||||||||||||||||||||||||||||||||
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Posted by James Knott on June 5, 2005, 10:58 am
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Siva U. Shankar wrote: > 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.. You've obviously got a cable problem somewhere. You've got two patch cables and one wired between the jacks. First verify both patch cables, you've already done one. Then check the cable between jacks. Is there another one you can try? Check continuity and also that the pairing is correct. Also, make sure the jacks are OK. Problems with them are rare, but I've occasionally seen ones, where one of the gold wires was not in the proper position. If you can get your hands on one, a cable tester will help. | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Siva U. Shankar on June 6, 2005, 2:49 am
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Hi guys! I'm going to buy a cable tester (IC network) and check the wiremap tomorrow. Since I dont have a cable tester at this moment. I'll post a complete test results by tomorrow. regards Shankar > Siva U. Shankar wrote:
> > > 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.. >
cables
> You've obviously got a cable problem somewhere. You've got two patch > and one wired between the jacks. First verify both patch cables, you've
> already done one. Then check the cable between jacks. Is there another > one you can try? Check continuity and also that the pairing is correct. > Also, make sure the jacks are OK. Problems with them are rare, but I've > occasionally seen ones, where one of the gold wires was not in the proper > position. > > If you can get your hands on one, a cable tester will help. > | |||||||||||||||||||||||||||||||||||||||||||
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Posted by John P. Dearing on June 6, 2005, 2:35 am
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Siva U. Shankar wrote: > 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 Are you *absolutely* certain that *both* ends are 568A. If one end of the cable is terminated 568A and the other end is terminated 568B then you effectively wind up with a crossover cable and not a straight through cable. By the termination, I'm not talking about the cable, I'm talking about the jacks. There is no such thing as 568A or 568B cable. Cable is cable, It can be rated to be compatible with the 568 wiring specification, but the cable isn't 568A or 568B. What *is* important are the terminations (jacks) at each end. It's the way the cable is terminated that determines if it is 568A or 568B. You can buy jacks that are 568A and you can buy jacks that are 568B. As long as you pick one kind and just one kind and stick with it, all will be fine. Start mixing 568A and 568B and you'll start having these problems. > 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. And I'll bet that eventually you end up with a 169.154.x.x IP address, don't you? That's APIPA. Automatic Private IP Addressing. When a Microsoft box can't get an IP address from a DHCP server it turns to APIPA to randomly assign a class B address by default. > When i connect the computer direct to the 3COM office connect it works fine.
So we've just eliminated the PC as a source of the trouble. I'm betting that you have a wiring problem between the jacks and patch panel. John -- John P. Dearing A+, Network+, Server+ To reply: Just drop "YOURPANTS" in my address! 8-) | |||||||||||||||||||||||||||||||||||||||||||
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connected CAT5e cable --> straight through/ 586A cable --> to a winXP