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Problem regarding slow bandwidth in netw

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by imranmcse

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I AM USING 100BASET NETWORK WITH SWITH INSTEAD OF HUBS. BUT HERE IS A PROBLEM REGARDING BANDWIDTH ON 300 FEET LONG CONNECTED CLIENT IN MY NEXT OFFICE.HOWEVER WHOLE NETWORK IS SHOWING BANDWIDTH OF 100Mbps. SO WHY LONG DISTANCE CLIENTS GET SLOW RESPONSE(WHEN SUBMIT SQL SERVER QUERIES) IN COMPARISON WITH CLIENTS WHOSE ARE NEAR TO SWITCHING ROOM.ALL CLIENTS ARE USING WINDOWS 2000 NETWORK.

7 replies

by langg

Depending on the quality of cable and connectors, the possible maximum length of cables assuring good signal trnsmission can vary. Be sure to use CAT5 cables with sealed, not only crimped connectors. Check possible damages to the cable.
The 100Mbpsindicator says nothing about the quality of transmission. The speed is getting less when packets have to be transmitted several times due to losses till they are received completely. I?m no expert, other reasons may be possible, too, but this happend to us.

by bazz00

IEEE 802.3 specifications for Ethernet networking say that a single cable length should not exceed 100m.
This is because of attenuation (loss of signal) The data physically cannot travel that distance over cat5 Ethernet without losing packets. This is why it takes so long to query the SQL server because the node sending the query is being requested to send the dropped packets again and again until the receiving node gets the complete number of packets which is how TCP handles packet transport.

To fix this problem you will need to place a hub/repeater/switch at 100m intervals. What this does is the devices receive the packets and forward them on thus giving them a brand new signal at full strength and allows them to travel a further 100m without significant signal degradation.

If you use a hub or repeater this will provide less latency (slowdown) than what a switch will.

I hope that this helps you

by ezmoney

Also check the route your cable was run. That is EMI can and will have an effect on the over all perfromance in long runs on unshielded cable. Running accross/on top of floresent lights and near electric motors or elevators can have adverise effects. If the cables were run in cable troughs by prefessionals this should not be a problem.

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