References
Sorry, at the moment I am enroute for a couple of days and I don't have the books with me.
I do know we have, in our OM (operations manual) a table spelling out the consequences of e.g. III E3 downgrading.
A couple of years ago we had a bit more extensive info about it, but in the drive to more simplification this info was skipped from our books.
Basically the suffixes indicate to what point along the centerline of the runway, what the integrity of the localizer signal is. (1 being low integrity, 4 high, T is 'till touchdown point, D and E closer to the stop end of the runway, if I recall correctly). I think that the philosofy of NOTAM writing has gone more in the direction of stating the result. Cat 1 T3 for instance could mean " no autoland allowed" / better option is to state that restriction, rather than to notify airmen of the T3 status and let them sort it out in their own books.