Installing alarm system on a 'prewired' house

["Zen" <lordzen@xxxxxxxxx>]

Hello,

My house had the alarm 'prewire' option and most windows and doors have
a magnetic contact in them. Also, in one of the closets near the
entrance, there is a bunch of wires and 2 power outlets.

In the closet, there are 7 white wires, 7 slight thicker gray wires and
1 green and 1 blue wire. I'm trying to figure out what these wires are.
My guess is that there are 7 white and 7 gray wires because the house
has 7 hardwired zones and the green wire is for the keypad and blue
wire is phone line. Can anyone tell me what these wires are? Also, I
couldn't find wires for a keypad anywhere else in the house. Does that
mean I'll have to install the keypad inside the closet next to the
panel or should I extend the cable for the keypad so it can be
installed elsewhere?

I'm considering buying a Ademco Vista-20PS with the 6270 graphic keypad
and installing it myself, hopefully it won't be that hard.

Any information would be greatly appreciated.

Thanks.