There is no such thing as LLU for FTTC.
LLU = Local Loop Unbundling/Unbundled. The local loop is the copper lines between the premises and the exchange. An LLU supplier has its own MSANs in the exchange and has full and direct control of the broadband connection via that copper line, which in effect terminates on those MSANs.
FTTC does not go to the exchange on those copper lines. It splits from the PSTN service at the FTTC cabinet having got there via the PCP, hence the name of the product. From there the copper returns to the PCP and onward to the original exchange destination.
The FTTC then goes to an Openreach termination block at either that or a bigger head-end exchange, and from there is connected using GEA link cables to the underlying provider. (BT Wholesale, Sky, TalkTalk, Vodafone and somehow to Zen).
In general, when an exchange first gets FTTC availability it will be BT Wholesale using it first as they get the GEA cable links in. Sky tend to be next. TalkTalk can be a bit behind. Vodafone I don't know about in this respect, and Zen's coverage of exchanges is relatively small.
GEA is Openreach's name for their FTTC/FTTP products, which satisfy Ofcom's VULA specification.
These providers have no direct control of the service. They can specify in their order on Openreach a few parameters such as a setting for highest speed, greatest stability, or a "happy medium".
Furthermore, LLU comes in both MPF and SMPF form. There is no technical reason for both ADSL2+ and PSTN services on a line to be from the same supplier. An example being O2, and Sky in earlier days. It is purely a marketing decision by broadband suppliers to force customers to put their line rental also with them.
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Edited by RobertoS (Wed 07-Nov-18 20:46:32)