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Mix of cat5 and cat3 causes network

By johnhoke ·
I have a network of about 100 users. we use a switch hooked up to 5 each 24 port 10/100 hubs. the network seems uneven in it's performance. there are no ram or hard drive considerations here. is it possible that there is some conflict (back up) between the 10 and the 100 base systems? we run no peer to peer activity. the server is used for file and print server only.

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Mix of cat5 and cat3 causes network

by McKayTech In reply to Mix of cat5 and cat3 caus ...

If your network includes both Cat3 and Cat5 cables, that alone could explain uneven performance. Category3 is only designed to support 10BaseT so running it between a 10/100 hub and a 10/100 NIC will have unpredictable performance unless you disable autonegotiation and explicitly set the NIC for 10meg half-duplex.

This is further compounded in a non-switched environment because the dirty signal that results from exceeding the design limits of the cable will cause more re-sends and that will increase the collision rate on the hub and cause even more re-sends.

Also, a single jabbering NIC can clobber the performance on a hub, sometimes to the point of bring communications almost to a halt.

These kind of problems can be painfully time-intensive to track down, even with the ability to do packet captures, but if you can at least discern a pattern you can know where to start. But I usually like to assure the physical integrity of the LAN first and that would, in this case, involve making sure you're not trying to run FastEthernet over a Category3 cable.

paul

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Mix of cat5 and cat3 causes network

by johnhoke In reply to Mix of cat5 and cat3 caus ...

The question was auto-closed by TechRepublic

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Mix of cat5 and cat3 causes network

by shmaltz In reply to Mix of cat5 and cat3 caus ...

I think (I'm not sure) that CAT3 wasnt even desiged for data only for voice.

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Mix of cat5 and cat3 causes network

by johnhoke In reply to Mix of cat5 and cat3 caus ...

The question was auto-closed by TechRepublic

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Mix of cat5 and cat3 causes network

by johnhoke In reply to Mix of cat5 and cat3 caus ...

This question was auto closed due to inactivity

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