Do these presenters typically have ISDN lines or were they setup? If they were setup would it be reasonable to ask the BBC to pay for them as it’s used for work?
I think key presenters and reporters have had ISDN lines for a long time. Andrew Giligan's fatefull 2003 report on R4's Today was made via ISDN I recall.
However, I suspect many are/will be connecting via their domestic DSL Internet connections these days. I think BT cease new ISDN installs very soon?
I forget how is an ISDN Line any different from a DSL and a generic phone line.
ISDN is not hugely different in physical cable terms to a regular phone line AIUI (it may take more twisted pairs) - but in connection technology it is VERY different to ADSL/VDSL/Cable.
ISDN provides 2 x 64kbps data connections. Very low bitrate compared to ADSL, VDSL, DOCSIS and the FTTP systems - BUT it is circuit switched not packet switched. It works very similarly to a regular phone line. Each ISDN line has a 'phone number' and so you dial-up an ISDN circuit to make a connection between two places. Once that connection is established you have a full-speed circuit switched connection between the two (*) with no contention, no packet loss, no drop out. It's a very sensible solution for voice connectivity - and is so ubiquitous here pretty much any broadcast TV or Radio outlet will be able to cope with it for audio.
The data isn't 'internet' - it's point to point (in the same way connecting two computers directly via dial up would be).
(*) HOWEVER some ISDN providers are now using IP connectivity to route traffic between their ISDN subscribers...
DSL is a relic here in most of the US, my family had it from like 97–2001 before switching to Cable. All I remember is that for DSL we had to add filters on every phone jack and connected the phone line to an external modem.
AIUI from friends who live in the US and Canada - it's only a relic in urban and suburban areas. If you are in rural areas that don't get cable - then ADSL or Satellite are the only real options (with some wireless connectivity also in some areas)
British Telecom were planning to replace the local copper phone loop to the exchange with fibre in the 80s, but commercially that only made sense if they could also offer TV services (effectively becoming a telephony and cable TV operator). The government of the day, under Margaret Thatcher, saw that as a monopoly-in-the-making so veto-ed it. We could have been ahead of everyone else (fibre can be repurposed many times with new fibre technologies - the expensive bit is rolling out the cable) but are now miles behind the rest of Europe.
In the UK we continue to push our twisted pair phone line further and further. ADSL2+ is the minimum offering (max of 24Mbs - but often much lower), VDSL (offering around 70Mbs max) and VDSL with G.Fast (offering up to 300Mbs) are the fastest connectivity over a regular phone line. VDSL requires cabinet based DSL interfaces close to properties, ADSL keeps them at the exchange. Confusingly VDSL is often described as 'fibre', just as Virgin's coax DOCSIS cable-based systems are... (The Fibre doesn't reach your home)
In Europe - because cable (which is usually coax based and can support high download speeds of 30Mbs-1Gbs but only modest upload speeds <100Mbs) hasn't been universally rolled out (and thus there isn't an existing coax cable buried infrastructure) a lot of countries have jumped directly to fibre. in Portugal ~50% of broadband connections to domestic homes are now fibre FTTP/FTTH. In Sweden almost every town has fibre networks installed by the local council that are then leased to broadband providers.
In the UK FTTP/FTTH is only really available in new build housing developments and apartments or in rural towns and villages that have successfully organised a critical number of subscribers to make it worth a company installing fibre infrastructure (with some government support)
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