Re: [Sheflug] Re: ISDN

[Dave Mitchell <xxxxx [at] xxxxxxxxxxx>]

On Thu, Oct 17, 2002 at 10:55:14AM +0100, Gary Stimson wrote:
> I thought the green cabinets were just switching boxes, i.e. one level down 
> from being an exchange, and the exchanges are mostly large shed-sized 
> concrete buildings?

Depends. BT's green cabinets are just big rows of electrical
connection blocks that join the little cable that goes to you house, to
a big multicore cable that goes to the exchange. The electrical connection
goes all the way from your phone to the exchange.

Telewest's green cabinets on the other hand contain SDH switches:
a short cable goes from your phone to the street cabinet; a fibre
cable then goes from the cabinet to other cabinets and the central
exchange.

ie BT has centralised echanges with long cable runs, Telewest have
small distributed exchanges with short cable runs.


-- 
"Strange women lying in ponds distributing swords is no basis for a system
of government. Supreme executive power derives from a mandate from the
masses, not from some farcical aquatic ceremony."
Dennis - Monty Python and the Holy Grail.
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