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Convert Coax to Twisted Pair

Posted on 1997-03-26
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Last Modified: 2013-12-23
I currently mange a network of 23 PC's run windows 95 and windows
3.11, with the server running on Novell 3.11. The PC's are connected
to the server in 2 daisy chains of thin ethernet coax to 2 network
cards in the server. All the network cards are 10Mbps cards.

What I am looking to do, due to company expansion, is completely
rewire the network with twisted pair with 100Mbps capacity and change
to NT. I would be very grateful if anyone could help me with the
following questions:-

1. The total distance from the server to where the last PC will be
located will be approx 250m,  therefore will I have to put in a
backbone of fibre optic cable to link the hubs as I believe that the
longest length of cat 5 cable between the hub and the PC is 100m. If I
have to put in the fibre optic backbone, how is it connected to the
hubs, is it a special connector and is it just a case of daisy
chaining the hubs together with a terminator on the last one and what
is the best grade of cable to use. Or could I just put in the backbone
using coax cable, If so what spec of the cable, is it just the same as
the thin ethernet cable and with a repeater at the 185m point. I also
want to keep the options for expansion open.

2. Would it improve the performance if I have 2 100Mbps cards in the
server and split the hubs between them or should I just have 1.

3. In a 100Mbps set-up is the signal split when it gets to the hub and
then to the required PC at a lower rate than 100Mbps, therefore there
being no benefit to changing the network cards in the PC's to 100Mbps,
or would I be better to change them as well to get the best
performance.

Any help would be very much appreciated.


Cer

Thanks for your quick reply

I think I will opt for daisy chaining the hubs using 100Mbit, with one 100Mbit card in the file server and putting 100Mbit network cards in the main users PC's and leaving the rest on 10Mbit with the upgrade option in the future. Could you please clarify a coupe of small points

1. The hubs I buy must be able to switch down the 100Mbit to 10Mbit for any PC that I have not installed a 100Mbit card and could I have some 100Mbit hubs and some 10Mbit hubs on the same backbone?

2. Will coax give me a 100Mbit backbone and what grade should I use i.e.. same spec as thin ethernet?

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Question by:colinm032697
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cer earned 50 total points
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For twisted pair you need hub's, daisychaining the computers is not possible. Daisychaning the hub's is possible. There are different hubs (switching, no switching), but I do not know which to recommend. It depends what performance do you really need. You can Daisychain the hubs using 100MBit connections, (making a backbone this way) and connect the PC's with 10MBit. The hub must convert the speed of course. If every PC needs the full speed, you must change all networkcards. I think better hubs can even autoswitch between the different speeds.
You can macke a backbone (to connect the hubs) wich is even faster than 100Mbit. This is only necessary if the backbone is the bottleneck, so if every PC uses 100MBit a lot. If the traffic per PC is low 10Mbit are sufficient and a 100MBit Backbone might be too.
Of course you get more performance if you install 2 networkcards in the server, the question is if you need this performance. if your Traffic is lower than 100MBit, there is no performance increase. Performence increases only if the (one and only) networkcard is the bottleneck.

In your case you must (first!) make up your mind where you need the inreased speed. Maybe it is sufficient (and much cheaper) to install more 10MBit Networkcards in the server, so every card is connected to a lower number of computers thus reducing traffic and load (per networkcard). For increasing the number of server networkcards you may considder installing one 100MBit card in the server and another 100Mbit card somewher else. Connect these 2 by twisted pair or fibre optic and install in each computer several 10Mbit cards.

  Cer

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by:colinm032697
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Cer

Thanks for your quick reply

I think I will opt for daisy chaining the hubs using 100Mbit, with one 100Mbit card in the file server and putting 100Mbit network cards in the main users PC's and leaving the rest on 10Mbit with the upgrade option in the future. Could you please clarify a coupe of small points

1. The hubs I buy must be able to switch down the 100Mbit to 10Mbit for any PC that I have not installed a 100Mbit card and could I have some 100Mbit hubs and some 10Mbit hubs on the same backbone?

2. Will coax give me a 100Mbit backbone and what grade should I use i.e.. same spec as thin ethernet?

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by:colinm032697
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by:cer
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1. you can not mix 100MBit only Hubs with 10Mbit only hubs on the same backbone. You need hubs which can do both. A 10Mbit only Hub can only be connected to a 10Mbit port of a 100Mbit multy Hub.

2. While you can use twisted pair for 10Mbit AND 100MBit, coax is only for 10Mbit.

Maybe you leave the old 10Mbit Network as it is and make a new 100Mbit network parallel to this. If you want to be flexible in upgrading later, you must put everywhere twisted pair and Hubs which can do 100/10Mbit.

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