There are two aspects to 21CN. The phone (PSTN) side and the broadband side.
Up until a couple of years ago samknows
, which is one of the primary sources of information for consumers such as ourselves, distinguished between the implementation dates of these on the exchanges as these could be very different. Now they don't.
It seems they just stopped reporting the PSTN side, as the remaining "title" is "21CN WBC status".
WBC is a BT Wholesale
product, whereby they install exchange kit (MSANs) capable of handling ADSL2+ (up to 24mbps) like several LLU suppliers have been providing for years. The backhaul on WBC is entirely
IP/TPC based, where the old stuff wasn't, though I believe it was in parts. This new backhaul has far more capacity than the previous.
FTTC is a BT Openreach
product, where they put small DSLAMs (similar to MSANs for this discussion), in street cabinets, fed by fibre optics from the exchange, so hugely decreasing the attenuation on the customer's broadband link. On these links they run VDSL2, which over the sort of distances involved is normally far faster than ADSL2+.
So in a way, Openreach are installing the "Next Generation" superfast broadband infrastructure, and Wholesale with 21CN (WBC) are trying to catch up with the LLU suppliers but also make "up to 24Mbps" nearer to
a nation-wide facility, and now making the FTTC from Openreach available to resellers in the same way as they do/did ADSL and ADSL2+.
The way that FTTC is being done Openreach connect the exchange end of the fibre connection to any CP's (Communications Provider's) MSANs. So BT Wholesale (21CN WBC) MSANs are an obvious. TalkTalk also now have such connections. The other LLU suppliers do not so far.
Hope that helps. Basically, it's two separate parts of BT doing different jobs.
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