[Badfox62]

I have a network setup running 10 systems one of the nodes is in my back shed but it is over 120 meters away so it drops out all the time because of the distance is there a network cable booster that i can place in shed the will boost the data signal

[Wilhelmus]

I suggest repeater.

The length limit for unshielded twisted-pair cable is 100 meters, so install repeater to, for example, 90 meters away your switch/bridge/router/etc.

[A]+----90m---+[R]+----30m---+

Quote:

[b]Repeaters

Since a signal loses strength as it passes along a cable, it is often necessary to boost the signal with a device called a repeater. The repeater electrically amplifies the signal it receives and rebroadcasts it. Repeaters can be separate devices or they can be incorporated into a concentrator. They are used when the total length of your network cable exceeds the standards set for the type of cable being used.

A good example of the use of repeaters would be in a local area network using a star topology with unshielded twisted-pair cabling. The length limit for unshielded twisted-pair cable is 100 meters. The most common configuration is for each workstation to be connected by twisted-pair cable to a multi-port active concentrator. The concentrator amplifies all the signals that pass through it allowing for the total length of cable on the network to exceed the 100 meter limit.

[felix]

You could try something like this.
A single copper pair can get up to 1.4kms or something like it.

http://www.advatel.com.au/transmissionProducts/goWide.html

We use a couple of these at work using our own cables and also through the local exchange with a cable that bypasses the switchgear. Obiously you would need to find a local manufacturer or supplier.

<edit> Actually it apparently goes further but anyway...</edit>