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Hub Vs. Switch Problem

We have 15-25 computers running in our orgnisation. One computer is Win 2000 Server and others are Win2k Professional connected via 8 port hub, cat 5 cable (D-LINK made), RJ45 Jacks (Wall mounting). Everything was fine till we changed hub to 24 port switch. Now no computer is able to ping each other. It gives request time out error. Then somebody told to decrease the lan card speed from 100mb full duplex to 10mb half duplex (He gave the reason that electrical wires may be running near lan wires, which is true as at some point they are running close to each other). All cables are running underground and in the walls. For testing, we laid a calbe outside the walls and it worked on 100mbs full duplex speed but it still gave timeout error after 50-100 successfull pings. Sombody also told us that our calbe is not 100mbs comptable.

Please let us know, what is the actual cause of this problem. Everything works fine on hub but speed is very slow.

Thanks in advance

Hiten

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Re:Hub Vs. Switch Problem

In reply to: Hub Vs. Switch Problem

I wonder if you haven't told the full story here. Why would you need ping?

Or are you writing that any machine doesn't work at all on the new switch? If so, the switch may have failed or indeed you don't have CAT5 (category 5) wiring.

Bob

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Re:Hub Vs. Switch Problem

In reply to: Hub Vs. Switch Problem

Are you now adding more computers to the network because you have more available ports? If so, only connect the computers that were in the 8-port hub originally for testing purposes.

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Re:Hub Vs. Switch Problem

In reply to: Hub Vs. Switch Problem

I have seen this before. I replaced a 10MB 16 port HUB with a 10/100 Switch. Most of the computers on the network went off-line. The nic?s and the switch showed connectivity, but data would not flow. I found only the computers with 10MBs cards wore working. So I forced the 10/100 cards to 10MBs and it worked. This is not a good solution. So I investigated. I found that the CAT5 was incorrect. The last guy to run the CAT 5, did not wire the plugs correct, so the cable was unable to talk at 100. I had to replace all the fittings, and wire correct. I also put in some STP (Shielded Twisted Pair), in the parts of the factory that had high electrical noise.

So, you must check the connectors to make sure that they are correct.

Then a second issue, the company had two E-machines. Nothing I did could get the nic?s in those E-machines to work with that switch. Temped in a new drop, moved the E-machine to the same room with switch, changed the nic speeds, nothing worked. I finally had to install a second smaller switch that the e-machines would work with.

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Re:Hub Vs. Switch Problem

In reply to: Hub Vs. Switch Problem

It sounds very possible that your CAT5 cable (assmuning its CAT5) is not terminated correctly. There are two wiring standards, T568A and T568B (most everyone uses the B standard). Go to http://www.duxcw.com/faq/network/diff568ab.htm for a color map. If your plugs don't look like one of these, you can run at 10Mbps but not 100Mbps.

Cheers
RC

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request timeout problem

In reply to: Hub Vs. Switch Problem

We have 15-25 computers running in our orgnisation. One computer is Win 2000 Server and others are Win2k Professional connected via 8 port hub, cat 5 cable (D-LINK made), RJ45 Jacks (Wall mounting). Everything was fine till we changed hub to 24 port switch. Now no computer is able to ping each other. It gives request time out error.

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Go back to what worked.

In reply to: request timeout problem

It appears you have some defective gear.

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