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[niemand]

More about replacing the legacy PSTN with IP.

Did they ever actually get this done outside of the trial area?

[WWWombat]

What is "this" that was to be done? Fibre-only (truly) in Deddington? Or 21CN Voice beyond Cardiff?

TBH I've not heard definitive statements of either.

But I agree that a migration of the voice service towards IP will be a driver for 21CN, as will backhaul capacity: IIRC, half of all hot VPs will be dealt with by migrating to 21CN.

[Chunkers]

I think perhaps it's targeted at people who don't want to pay more because I don't see people like me who have a "slow speed ADSL Line" necessary getting much of a better service from FTTC so certainly wouldn't want to pay more than for ADSL.

Obviously the FTTC price premium reflects the faster speed so in my mind no extra speed = no extra spondoolies

o/

J

[niemand]

21CN voice. It was supposed to be a national deployment originally. 21CN's primary driver was enabling retirement of legacy PSTN kit through replacement with soft switches, media gateways and IP. Got as far as replacing ATM backhaul with IP and seems to have stopped there.

[WWWombat]

I guess the nature of the plan has changed somewhat.

In today's quarterly results, there is a "Capital Markets Day" (presumably begging negotiating for the £6bn they need for the coming upgrades), with a hefty set of slideware.

The session 2 slides have some pages from TSO on their core network plans (p28-38), including their timeline for convergence to an all-IP network (p32).

The timeline suggests consumer IP-voice services in 2018, and all-IP by 2025. In one of the slides on "future voice", you can see quotes of:
- "PSTN equipment can’t be maintained indefinitely as costs rise – it’s time for a new generation of technology"
- "We’re comfortable sustaining PSTN out to 2025 but the future is IP"
- "We’re starting to trial IP voice with residential customers – scale trial in 2017"

A 7 to 8-year plan to transition from PSTN to IP: something like 4 million lines per year.

Included is a slide on the core network:
- "10G upgraded to 40G+ with future ‘terabit’ capability"
- "10x the capacity at less than a fifth of the cost of 21CN"
- "Significant cost reduction of 60% per Mb"

The timeline page reckons on a "10Tbps core" by around 2019.