Is it a closely guarded secret as to what OLT is at each exchange.
Not publicly available info.
If your exchange has Huawei FTTC cabinets then it has a Huawei OLT.
Exchanges can have both Huawei and Nokia OLT's though.
Some FTTP on your exchange can be on a Huawei OLT while other FTTP can be from a Nokia OLT.
You won't know until it's installed.
You could ask a direct neighbour on the same PON as you (the same splitter, up to 32 properties) if they have a Nokia or Huawei ONT.
As you say it really doesn't matter as they both do the exact same thing and the available speeds is the same on both. ***
I was just pointing out that there isn't going to be a switch to the newest ONT for everyone just because it's newer.
It's not like ISP's switching to providing their latest Hub to new customers.
It entirely depends on what Vendors equipment is at the other end of the fibre as to which ONT you will receive.
*** Some FTTP is still connected to ECI OLT's and should come with an ECI ONT.
FTTP on an ECI OLT is limited to 330Mb.
The last word from OpenReach was that less than 50,000 properties were limited by an ECI OLT.
That's 50,000 passed properties and not active connections.