[Sephiroth]

typosThe extra small door on some cabs are telephone terminations. If it's a very large cabinet with CATV on the floor, then it's a telephone only cabinet.

The colours on the drawing are as follows:

Red square:--------------------Typical VM cabinet
Red rectangle with 230 legend:--Optical Node

Green square:------------------Typical BT cabinet
Green rectangle with F legened:-BT FTTC cabinet

Numbered roundel:--------------Number of homes in the street (from electoral roll)

As it happens, there is a VM Core station in Wharfedale Road, where the backbone passes through (as in winn-bb-1a-so-130.virginmedia.net). So all the optical nodes from Bracknell, Wokingham, Winnersh to the east and a whole chunk more from the other directions) pile into Reading where there are 23 CMTSs. Each CMTS has 12 line card slots. Each card (of the type they're putting in now) provides 72 downstream and 60 upstream channels (the older line cards do 20 DS + 20 US channels).

From Reading, a head end switch sends the aggregated data from the CMTSs to Winnersh where it is switched onto the backbone that you see on all the traceroutes people publish.