OT Escape from Castle NTL

[tony sayer]

In article , gort writes

Well aren't BT claiming that BB is now within reach of some 98% or is that not right?...

[Owain]

It may be that 98% of people 'live in an area served by a broadband-enabled exchange'.

It doesn't mean that everyone in that area can get broadband though.

Owain

[tony sayer]

Well just how far does the wiring extend from a BT exchange?, AFAIK BB connections are possible, tho not that fast!, up to some 7-8 Km....

[Owain]

It's not the distance, it's the attenuation...

With a 50V ballast resistor bridge (50 ohm elements), a modern telephone incorporating ASTIC, and 20 lb/mile UG cable, 570 ohm line loop is the max permissible resistance for 60mA transmitter current, equating to

6.45 miles. [Atkinson]. (This was when trunk lines were cabled in up to 100 lb/mi.)

I expect loop length was pushed further when electronics got pushed into local exchanges.

Bandwidth deteriorates rapidly with line length; which means that broadband-users located beyond 3.8 miles (6 kilometres) from their local telephone exchange are restricted to 1Mbps or less.

news: Jim from Lincolshire with a loop length of 11 kms won the uk.telecom longest local loop award, beating off the previous holder from somewhere near Spean Bridge.

Owain

[Dave]

Wonder if it's the same guy who keeps calling me from India saying "Helo how arre U today. You have been selected at random... and have wona free ". Never found out what it was as I put the phone down. Blimey, hope it's not NTL support!

[tony sayer]

Arguably much the same thing;).....

is what people find the best attribute...

Jezzzz thats going some!....