FAST ETHERNET CABLE LENGTH 1

[r19h72]

Hi,
I'm currently using 10Mbit components for my industrial ethernet connections. For this solution I know the cable length limitation. I know hw to cascade Hubs.
But how does this work with 100Mbit ethernet? Can I cascade the segments of the network when I use switches instead of hubs? (Cascading of Hubs will not work, because of the collission detection.)
With cascading I mean extending the network with the hubs not placing all together in one place, but 100m away from each other.

Please help me!

 

[MMAshwin]

Hi,

I take it were are talking CAT5 UTP when your talking of the connections ?

If so then even for 100 Mbps the max length is 100M to the nearest Hub. The maximum distance between two hubs is only 5 meters. And you're supposed to have only two hubs between stations. That means a maximum of 205 meters between stations with two hubs in between.

One thing you must make sure with your network at 100Mbps is that all the NIC and Hubs run at 100 Mbps otherwise the network will drop to the slow speed of 10 Mbps.

If you need to extend the range furthur you could use a switch which could connect two hubs together. This will resolve the collisions and extend the range by 200 m.

If your using fiber instead of UTP then of course the range is longer (and the price more expensive) as the distance
between hubs is about 400m.
Any help ?, yes no let me know.

Regards

 

[snowdrop]

how fast does fibre optic cables run at?

 

[MMAshwin]

Hi Snowdrop,

It all depends on the what the fibers are conected to rather than the fibre optics themselves.

You get fiber optic systems running at 10 Mbps (as in 10Base-FL) or at 100Mbps (as in 100Base-FX).

Also like regular cable there are different grades of fibre optic cable and different ways to send the data down it such as Voice Grade fibre or muti mode transmission.

So the answer in summary is, It Depends !
Any help ?, yes no let me know.

Regards

 

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http://www.helmig.com

I think you will find the answers.
Please turn back if you want another web sites
emrah_turan@yahoo.com

 

[jpoole]

My network is simialr to Hannes's but I have 3 switches connected together. The distance between the 1st and 2nd switch is about 200+ ft. The distance between the 2nd and 3rd switch is about 80 ft. The server is about 3 ft. from the 1st switch and the furthest computer (connected to the 3rd switch) is about 25 ft. This would mean that the furtest computer (travelling through all 3 switches) is about 328 ft. This should be in line with the 100 m of 100 MB yet I have communications problems on the PC's connected to the 2nd and mostly 3rd switch. Can I not have these switches connected in this manner? You stated that you should only have 2 HUBs between PC's. Does this apply to switches as well?

Thank You

jpoole

 

[VxA]

If you are using two repeaters in a Fast Ethernet application, you must ensure that they are ClassII repeaters. They have a smaller delay than ClassI repeaters. You may only have 1 ClassI repeater in a single segment.

 

[maelstrom]

http://www.tele.sunyit.edu/des22.html/

has a good description of segment limitations for 100BaseT over copper.

It even includes details for switches instead of repeaters (switch = DTE in that context)