Re: Switching wires in the pair improves ADSL connections?



kraftee wrote:

Eeyore wrote:
steveybar wrote:

Each Master Socket contains a capacitor, and each PSTN lines'
impedance matching is based on just one line socket capacitor at
the customers end of the line.

NO. The ring cap doesn't come into it.

Of course it does, and so will all the extra capacitors if master
sockets are fitted instead of slave sockets for extra extensions.

Pure nonsense. In most cases the extra cap doesn't even connect to
anything since it's superfluous. The proof of this can be seen by
disconnecting the green (bell) wire ona BT wired extension circuit.
Everything works as normal. It's purely there as a 'legacy' thing
for the likes of old rotary dial phones.

The ring circuit on almost every modern phone (actually almost
certainly ALL modern phones) is derived from the A and B lines
directly and doesn't use BT's bell circuit. Hence providing a bell
circuit at each outlet simply makes no odds. It just doesn't go
anywhere and can't affect anything. Even if it DID it still
wouldn't be a problem.


If this isn't the case, why then is it the norm for just 1
master socket and all additional sockets to be slaves (no
capacitor)

It's just how BT always did it. It's not that way in other
countries and ADSL works just fine there too. In fact, the very
reason for the ring wire that messes up the line balance at ADSL
frequencies is because of the single cap idea.

Graham

Yes this is how BT always did it for the reason I have stated.

RUBBISH.


Other countries' network/line impedances are different from that
of the UK.

Pure bollocks. You haven't the tiniest clue what you're talking
about.

The impedance of a twisted pair at ADSL frequencies is set by the
laws of physics and is around 100 ohms. Much like CAT5 network
cable in fact.

STOP TALKING GARBAGE.

Graham

You should stop looking in the mirror when you are posting.

You, as usual when you get the wind in your sails, are incorrect. To
many capacitors on a line can cause several problems on the line,
phones not ringing or ringing incorrectly, low audio both ways or one
way & so on.

Sounds like a problem of too many devices on the line (high REN), not how
their ring circuits are connected.


To many capacitors do unbalance the line (to the specs
Openteach/BT work) & of course you are ignoring the fact that all
capacitors do leak, hence another reason for problems.

NO

ALL capacitors DO NOT leak unless you count femtoamps. Plastic film caps
do not leak to any practical degree. Their DC resistance is beyond
gigaohms.

Perhaps you'd care to explain how ring caps UNBALANCE the line when the
load is across the A and B lines ? There's no phantom path e.g. to ground
which could ccause imbalance.

And how the heck do you think ADSL works in other countries that don't
have BT's daft ring wire ? This is the ultimate proof of the nonsense of
this idea.


Yes to many ringing capacitors can cause problems especially on the
more remote DSL services.

By the way shouting doesn't make you look any cleverer & I fully
expect your normal bluster & rage, which you normally do.

And you should stick to being a technician. You clearly don't properly
understand electronics theory isues.

Graham


.

Relevant Pages

  • Re: Switching wires in the pair improves ADSL connections?
    ... matching is based on just one line socket capacitor at the customers end ... The ring cap doesn't come into it. ... and so will all the extra capacitors if master sockets ... The ring circuit on almost every modern phone (actually almost certainly ALL ...
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