Hi

We are building a small (<10sqm) office in the garden. It'll have power (underground) and network to connect it back to the house (where the VDSL is). It's about 30m from the edge of the house to the edge of the office, and we are going to have to bury the power line - and the network I guess.

I was thinking about the ways to wire it up.

Ethernet - CAT6? 7? - seams like the obvious one, but the cable would need to be laid WITH the power cable (which is basically a long extension cable with some outdoor ruggedness added, and inside a conduit). But... ethernet and power don't mix well, not when they are run next to each other, right? Would shielded ethernet fix this? 

The other idea I had was to run fiber in the trench, and put a converter on each end. All the converters I can find are only 100Mbps, tho, and I'd prefer Gigabit as thats what the rest of the house uses. Is this normal, or did I miss something in my google search?

Putting two tubes in the trench is a possibility, but I'd prefer to just put one in. 

Any thoughts?

Thanks

Nic