It would depend on the fax machine model, operating system, and how each is configured. Some may allow for it, however most would require a normal network protocl instead of a direct connection through ethernet.
Today, most of the fax machines that can communicate directly with a computer do so over USB.
You will need about a 10' X 4' area to use the Body Solid Powerline Cable Crossover Machine.
If both have a network connection you can use a crossover network cable.
The Body Solid Powerline Cable Crossover Machine is simple enough to use for a beginner. But with variable resistance, it is possible for even a well conditioned powerlifter to get a great workout.
If you are using a crossover cable, simply assign static IP's to each machine (192.168.0.2 and 192.168.0.3). If using regular network cable, you will need to use a network switch or hub to connect them together, still using the static IP's for each machine.
need a line for a FAX MACHINE
There is no fax machine with a camera,some people use there digital cameras instead of a fax machine.
Using a fax machine is a really easy process once you have done it a few times. Once you go through the initial process of learning how to use your fax machine by reading the instructions and then following them, you will know how to use your fax machine whenever you need it. A fax machine is not a complicated machine, but there is an order that you must follow when using the fax machine.
Crossover
There are online fax services, but you will need to have a fax machine handy. There is no way to send a fax withouth the use of a fax machine, even wirelessly.
Assuming that by CPU you are referring to a separate desktop machine, you can use a crossover ethernet cable to connect them directly
Use a crossover cable.
There is no Canon fax machine with model #i3805. To use a generic fax machine, send by putting your document in the feeder, dial the number, and press send.