OK, so I'll be honest I've just reading the various things here and on PN regarding this - an "interesting" exchange of information/ideas to say the least...
So that I understand what's going on...
There are a variety of different profile options:
Error Protection Off > Retransmission Low > Retransmission High > Interleaving Low > Interleaving High
These are supposedly rolled out to all Huawei cabinets, but not all Huawei cabs are G.INP enabled - in this situation Error Protection Off is the equivalent of FastPath. When retransmission is enabled on the cabinet, interleaving would be applied sparingly [not at all?].
Error Correction (FEC/HEC etc) is about redundant information being encoded (in the same way that FEC works on DVB-S/DVB-T - there's no retransmission involved/required since this can be reconstructed from the redundant data). The clue here is that the F stands for "Forward".
Error Protection basically means G.INP.
G.INP potentially reduces the need for as much data to be redundant (again, as per symbol rates in DVB-T/DVB-S) by effectively increasing the symbol rate but allowing for retransmission when needed. Where people have moved from interleaving to G.INP they've "reclaimed" bandwidth that was previously used for Error Correction.
Looking at
MDWS, we see people who have G.INP, people who are interleaved and people on Fastpath.
The important numbers involved are the amount of "INP" on each line. If this is combined with "Delay" you're on an interleaved line, otherwise you're G.INP'd (INP == 0 = fastpath).
No one seems to know what constitutes Retransmission Low vs Retransmission High - presumably this is related to the Interleaving Depth? No-one on MDWS seems to have an interleave depth of more than 16 (when G.INP is enabled).
Now most of the above was about Downstream - upstream seems to be a case of Fast Path vs Interleaving, with G.INP being on lines which have not resynced/retrained since the profiles have updated...
ECI cabinets seems to be (still) FastPath vs Interleave - there's no G.INP option. Likewise with some Huawei cabinets (like mine!). There doesn't seem to be an ETA, nor obvious pattern on which cabinets are being "upgraded", but there is an assumption that ECI will happen after Huawei.
Am I thinking along the right lines, or have I missed/misunderstood something?