In autumn 2014, Openreach applied for the right to use unmetered power supplies for the cabs. As part of this, they provided a breakdown of the makeup of a large subsample of their cabs.
These are the numbers:
- BT's likely installed base = 55,000 cabinets
- Sample size = 34,400 cabinets
- ECI M41 = 15,300
- Huawei 5603 = 14,500 cabinets
- Huawei 5616 = 4,600 cabinets
So ECI provided about 45% of the sample, while the sample represented about 62% of the installed base. If the subsample was representative of the whole, then there will have been around 25,000 ECI cabinets in total.
BT had largely finished the commercial rollout at this time, and was well into the BDUK projects. What I have seen suggests to me, as others have seen, that Huawei has taken the lion's share of the BDUK market. Not exclusively at the start, for sure. But I have seen plenty of exchanges that were ECI-only in the commercial rollout, that went with Huawei for the additional BDUK cabinets.
BT now have around 80,000 cabinets. If the extra 25,000 cabinets were all Huawei, and the 2014 sub-sample was representative of the whole, then ECI would now be about 31% of the installed base.
BT originally trialled ECI in York, and that exchange has early and late examples of ECI cabinets being deployed, from late 2010 to early 2015 - with a smattering of BDUK Huawei's also appearing in 2013-15 too. However, the 2017 cabinets are only Huawei's; March 2015 is the most recent ECI installation I have seen (unless you know better), so that 31% estimate might well be a reasonable one.