Post by Graham J[snip]
Post by MikeSBT have a firm intention to turn off the traditional *analogue* phone
service. In areas w/o BT (Openreach) fibre they will supply customers
with a digital voice service using the existing copper connection.
Most of them are probably already using the copper for broadband anyway.
Broadband over copper wires is far too unreliable to support VoIP.
That does not really make any sense to me... I have plenty of customers
who have all their business critical voice traffic over VoIP in offices
serviced by FTTC / SoGEA connections.
Post by Graham JTypically ADSL gives about 2Mbits/sec max and re-syncs several times per
day taking a minute to do so each time.
Who's ADSL though?
Sure ADSL can be poor on long lines, but can give reliable service in
the right circumstances, and a speeds more than adequate for VoIP.
My ADSL service limps along at 1.5 to 2 Mbps down, 800k up. However it
is a stable connection and will work for weeks at a time without a
complete line drop.
Post by Graham JVDSL is better if the green
cabinet is less than about 100 metres away, but further than that and
you get poor speeds and variable reliability.
You will get the highest rates at lines distances under 400m, however
you can still get 20/4 at over 1km.
VoIP is not a high bandwidth application (it can run quite acceptably
over dialup). GSM phones managed ok ish voice quality on 13 kbps.
What matters more is the router having proper quality of service and
bandwidth management to ensure that the VoIP traffic never gets swamped
by other applications.
Post by Graham JA re-sync still takes
about a minute - imagine that during a phone call !!!
Connection stability is a different problem from speed or latency or
jitter. Plenty of VDSL connections will have up times measured in weeks
or months.
Post by Graham JI've noticed that FTTP is being rolled out in populated rural areas
where copper broadband is unreliable. In less populated areas where
copper broadband is effectively not available there's no evidence of
fibre being installed.
ISTM that openreach had been prioritising FTTP in cases where they can't
(and could never) meet their minimum broadband performance requirements
using ADSL. Many rural settings don't have any street cabinet furniture,
so the choice would be run fibre 99% of the way, install street cabinets
for VDSL, and then connect that, or just do fibre 100% of the way and do
without the street cabinets and their power requirements.
It is fairly obvious that going for an inferior experience, at massive
extra expense makes no sense, so FTTP wins.
However FTTC made lots of sense in areas with the infrastructure already
in place, and it was an easy upgrade at the time.
Post by Graham JBut in towns where FTTC (i.e. VDSL) is in use then VoIP may be supplied
by 2025 as threatened by Openreach. It will be a disaster, mainly
because the public has not been properly informed. Listen to any Radio
4 consumer program.
Time will tell, but I expect for many it will be an almost invisible
changeover.
--
Cheers,
John.
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