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Market 1 no longer exists - it's now Market A and Market B.
I haven't kept up with the regulatory issues surrounding end user port costs, but it may well be that the price differential for BT Wholesale end user ports on Market A exchanges has ceased to be a significant driver for unbundling the remaining 'BT Wholesale only' exchanges. The LLU providers are likely to have unbundled those exchanges they feel are commercially viable by now. Those exchanges remaining 'BT Wholesale only' are likely to be small, difficult to reach with fibre because of geographical issues, or both of these.
The future prospects for unbundling the remaining 'BT Wholesale only' exchanges have been further damaged by the understandable tendency of Openreach to connect FTTx in the footprint of a small exchange to a nearby larger exchange. This practice is why there are areas with FTTx but not 21CN ADSL2+. BT Wholesale may well struggle to justify providing 21CN ADSL2+ at a 20CN only exchange which doesn't parent its own FTTx.
20CN backhaul is an issue, as data usage continues to grow and there is only so much that can be done to expand capacity on this obsolescent network. 20CN backhaul is significantly more expensive than 21CN or wholesale LLU backhaul, which is the reason why some ISPs offer different products (or higher prices) in areas that are 20CN only.
There are others on these forums who have a far more detailed knowledge of the regulatory and commercial realities of unbundling than I do.
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