Sorry, this might be long-winded, so bear with me while I explain my current set-up. My house is on a hillside, and it's 2-level with an A-frame ceiling upstairs (so the side walls are short and there's a crawl-space behind them that runs the length of the house). At the front the property is 3 stories high, with the carport going underneath the house. That's where the Telecom, power and water connections come in, just at the edge of the concrete parking pad.


This is a photo of my line in. As you can see, it appears to be split right at the entry point. In the second photo, it shows the two lines going in separate directions. The right-hand line is immediately split into two (that's the tangle of bare wiring and connectors barely visible under the green and black cables to the right of the picture). One bit goes directly up and is the jackpoint installed by the Sky technician when they put in our digital decoder, presumably for future cable connections? The other bit runs around to the front of the house and terminates at our telephone jackpoint in the front of the living room. The left cable meanders off under the house and at some point goes up through the walls. I believe it ends in the upstairs master bedroom, which is where I have this:

Yes, it says "Jetstart" - that's how long ago it was put in, LOL. The box beside it is a functioning telephone jack. At the time of installation, that room was the computer room, however now it's back to being the master bedroom, and therefore I got Telecom out to move the broadband connection to the rumpus room, which involved them running a cable out of the jetstart box, along the skirting, into the crawl-space and popping out of the wall below the computer desk. I measured it at 9 metres. I don't know what cables have been used. The house was built in 1993, if that's any guide as to the main wiring.
So, my questions - is that thing where the cables come up from the ground a splitter? Or just two phone lines? Is the thing in the master bedroom the splitter?
Assuming the line is only split in the bedroom, if I want the VDSL jackpoint in the upstairs computer room, is the Chorus tech likely to be able to do that given he has no access to running cabling up through the walls of the house, and it's essentially 3 stories off the ground? Or do I need to pick a new location in the living room downstairs (which can be easily accessed from the carport ceiling below it)? And if so, will having the modem downstairs and the main computer upstairs mean a crappy wireless signal? The house is not big - 129sqm, and there's no steel framing bar two girders under the ground floor. The main computer is a 2008 Mac Pro, which is not wireless capable, but I've tested an Edimax wireless USB adapter in it, and achieved almost identical speeds to the cabled connection. Granted, the wireless modem (a Time Capsule with Airport Extreme) was only 2m away.
If the modem goes in the living room, can it be situated on the home entertainment system cabinet, or will that be too much interference? There's a MySky decoder, a DLNA capable home theatre system and a TV there, plus cabled speakers to each side. There is another spot on the other side of the room, on top of a tall bookcase, which is rather central, but through the wall behind it is the master electrical circuit breaker box.
Sorry for all the (probably silly) questions, but I'd really like to be prepared when the guy shows up, and to make decisions that will give me the best chance at achieving my optimum connection speed.