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Hub 2 Hubs

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8 replies

by mohed102

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Hi everybody
I have one 16 port hub upstairs with 4 PCs , and downstais I have 16 Switch with 8 7 workstations and one domain server (WINdows NT). Again I have another hub in another ofiice with 4 PCs. My problem is : there is no conection between the two hubs downstairs (Can I connect one hub to two hubs?). Also the LAN is very slow..Help.... Help..Help.

8 replies

by road-dog

1) Is this a new Configuration or did it work at one time?

2) What do the link lights look like?

3) Have you done any IP Connectivity tests?

4) Do you see any collision lights blinking excessively?

5) What do the traffic lights look like?

by jklein

Does the distance between the hubs exceed the 100 Meter recomended distance. Does the cat-5 traverse any floresent light fixtures, or is this in a machine shop or manufacturing setting where there are alot of electrical motors that can cause signal loss?

Did you have in a tradesman who could have damaged or moved your wires recently?

I have scene these enviremental issues cause problems, maybe one fits your problem?

by mohed102

Thanks for your response

The distance between the hubs doesn't exceed the 100 Meter. Actually, I have replaced the cables with a new ones. The lights look OK. ALL green , but i missed the connection between two hubs

by road-dog

If the Traffic lights are not indicating collisions, then you need to move up the OSI stack. I suggest PING testing. Ping between PCs on the different hubs. The ping times should be uniform, as its a single collision domain. If you are losing pings,then you need to disconnect the hubs one at a time and see if performance improves.

by rsison

It has been stated that the hub are not connecting so ping command won't work.

by rsison

In your case it I would like to suggest the following to be checked.
1.Look at the HUB connection .. you might need a cross cable to connect them, but if there is a uplink port you need to use one in the hub while connecting to the other hub on regular port.
2. Check the setting of the hub if it is using auto sensing in transmitting data. It might happen one is set at 10mbps while the other is set at 100mbps.
3. Get a good cable tester to check the wire pairs for it might happen you happen there is a link (green light) but line 1&2 are not linking. Remember line 3&6 are the one which makes the the led glow.
4. For the issue that LAN is slow ... it might happen you that one of the pc has a bad NIC and it is doing a broadcast and it consumes the badwidth. Don't discount also that the switch has a problem too. Just for a test I would like you to test if you could connect the two hubs without the switch.

Good Luck

by road-dog

Is the same guy, then he says he has good Link lights. This being the case, the real question is if he has layer 3 and up connectivity. With less technically savvy users, the ping test is the first test above layer 2......

by network_driven

The Documentation that came with each hub should show you the configuration choices available. If not available, visit their website for model info.
The LAN could be slow for many reasons. 1. The speed is determined by the slowest link speed in the broadcast domain i.e.: 10baseT or 100BaseT. if these are passive hubs, you could be experiencing
thrashing in the domain. Repost with more hard specs.

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