Date   : Sun, 21 Mar 2010 11:04:08 -0000
From   : blip@... (John)
Subject: [OT] ADSL capabilities

I believe this will work, but only if you use modern phones - older phones
on the extension wiring may not ring if you disconnect the bell wire.

Personally I have a wireless setup with a base station and all the extra
handsets wireless, as this places less 'load' on the line.

The point about the router is also very relevant - even different routers of
the same model can perform differently. Check/borrow as many as you can, and
ensure the one you use is ADSL2 compatible for when that happens.

When I went from the old white home hub to a new black one, it was synching
@ 4.5Mb as opposed to 3.4MB average.


Try a speed test to see if your ISP is throttling you, and also try large
ping tests at various sizes - 32b and 100b might work, but will 1000bytes?
Dropping packets at this level can show intermittent connectivity, beyond
the usual last mile tests and into the DSLAM/MSAN/whatever.

Check for sources of interference - motors, fans, transformers, fluorescent
lights, street video cameras (yes I can hear you saying wtf but it happens)
etc.


Regards



John Terry







-----Original Message-----
From: bbc-micro-bounces+blip=blipit.com@...
[mailto:bbc-micro-bounces+blip=blipit.com@...] On Behalf Of
Darren Grant
Sent: 21 March 2010 09:57
To: Mike Tomlinson
Cc: bbc-micro@...
Subject: Re: [BBC-Micro] [OT] ADSL capabilities


On 21 Mar 2010, at 07:25, Mike Tomlinson wrote:
> 
> A 4132Kbps sync sounds reasonable given your line length and attenuation
> figures. You could try a BT iPlate (I know you're in France, but it's
> all the same) and borrow a few different routers to try.  Some are
> better at negotiating a higher sync speed than others.  Changing from a
> Siemens router which sync's at about 7052Kbps to a Netgear DG834GT (2
> quid on ebay) got me an instant increase to 8032Kbps and it hasn't
> changed since.  I'm 2.5kn from the exchange, in an old residential area.

The iPlate would be utterly useless as the french do not use a 3 wire
system. The BT iPlate is a very basic device that simply isolates the ring
wire. In UK telephone wiring it is a 2 wire system all the way to the house
where a capacitor is used in the master socket to provide a separate ring
signal, making it a 3 wire system.  Because this capacitor is in the master
socket before any ADSL filters the ADSL signal goes down the ring wire and
causes an imbalance on the otherwise balanced ADSL signal.

The iPlate is designed for luddites who are scared of wires, by fitting the
iPlate between the back box and the faceplate on an NTE-5 master socket the
ring wire is isolated by using a simple RF choke. For those of us that are
not scared of wires this same thing can be achieved by removing the ring
wire on terminal number 3 for Free !

The best way however is to optimise your broadband is to fit a filtered
faceplate so that the ADSL signal is filtered at the master socket so it
doesn't have to travel through all of the extension wiring that is often not
twisted pair.
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