Limited Connectivity thru a Switch

January 10, 2010 at 07:14:51
Specs: Windows Vista
I have run a Cat5 cable from an office on the 2nd floor to the basement, total length +- 100’. It is UTP Cat5 configured as a Patch and was NOT ready made. In the office it’s connected to a Dlink DR-615 Wireless Router.
If I connect the cable at the basement directly to a computer it works fine. If the computer is connected thru a switch at the basement end I get “Limited Connectivity” and NO IP address. I’ve tried this with 2 computers, IBM Thinkpad T40 and Lenovo T400, 2 different switches, a Dlink 5 port and an Airlink 5 port, same results. If I connect either computer thru either switch in the office everything works fine. I've tried the cable plugged into a switch at the office end and direct connected to acomputer in the basement and this also works. I tried using a Crossover connector between the cable and the switches in the basement, no luck. I’ve replaced the plugs at both end thinking it was my wiring. Again, no change.
It would appear to be a bad cable but my confusion is why does it work when connected straight from the router or switch to a computer and not thru the switch(es)
TIA

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#1
January 10, 2010 at 07:32:19
I just had a similar problem. The customer has Verizon FIOS which I have as well. Mine works great.

At the customer's house, I ran 75 feet of cat5 cable to another floor into a converted attached garage & it just wouldn't work right. I told her that the router was bad. Verizon told her it was fine. That was 6 months ago. Finally, I ran a new cat5 & had the same problem. We called Verizon & after 15 minutes or so, they agreed to send a new router. That solved the problem. I think your switch is the problem.

How do you know when a politician is lying? His mouth is moving.


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#2
January 10, 2010 at 09:33:13
The router and switch are know quantities, both are in play in the current configuration, 1 computer, an IOCell NetDisk and a printer connected to a switch. That switch, and two other computers (one in another room) connected to the router. So I'm pretty certain that the hardware is OK. I can replicate what I'm trying to do with a different cable between the router and the switch and everything works. The variable is the cable run to the basement. But like I said I dont understand how that cable works direct connected but NOT thru a switch.

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#3
January 10, 2010 at 13:08:17
How long is the cable running to the basement?

On the job I described, the router couldn't handle the longer cable.

How do you know when a politician is lying? His mouth is moving.


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#4
January 10, 2010 at 18:29:01
When connecting LIKE devices, eg Router to Switch, a Crossover cable is required unless either or both devices has auto sensing, self adjusting ports. Port re-configuration requires a complete power reset of all devices in the chain. This is where I suspect your problem lies. With the cable wired as a PATCH cable it will work when connected router to PC. It should work with a crossover adaptor when connected router to Switch. I suggest you get a cable tester to verify continuity, and to perform a power reset of both router and switch when any configuration changes are made. 100' for a CAT5 cable is well within normal tolerance limits. Max length is 100m (about 330')

Goin' Fishin' (Some day)


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#5
January 11, 2010 at 08:01:39
I never had to use a crossover cable with that type of setup.

How do you know when a politician is lying? His mouth is moving.


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