Re: Build network help
Whats your speed at ADSL line? if its below 10 MBit, than there might be no speed advantage to use an coax cable or not. Collisinon based ethernet might be loaded until 70% of its capacity, means: maximum performance is 800 Kbyte / 20 PCs is 40 KByte. As not all PCs will perform a maximum download it might reach out to use a single backbone.
250 m is behind the specification of an coaxial cabling, but probably you are able to insert a repeater or another pc in the middle of the way ... Otherwise the load for the whole cable segmment will fall below 50% because of reflections in the cable
a better choice might me to use a wlan router. The price for a router is about 50-70 EUR. No cabling needed, simply insert the components and it will work
The price for a (USB) based WLAN adapter for each PC is 40 EUR. Thats not too far away from an old-style coax NIC for each PC, and Cabling / connectors, plus additional effort to install the cable