160 baud ALDL data stream format - reference URL?

[Peter Gargano]

I looked through the archives and found an explanation by Steve 
Ravet (thanks Steve), of the 160 baud ALDL data stream. The diagram
goes something like this:

       160 baud data format - 1 bit time

             S   0        1    S
         ..__     ........_____    ...
             |   ^        ^    |   ^
             V___|........|    V___|.. 
            T0   T1  T2   T3   T4

Time T0 to T4 is 6.25 mSec (ie 6.25 mSec = 1/160 Sec ==> 160 baud)
     T3 to T4 is minimum of 0.5 mSec
     T0 to T2 is between 1.5 and 2.3 mSec

A zero or one bit is determined at time T2 (the  sample time).
A low voltage is a 1 logic level and a high voltage is a 0 logic
level for the bit.

QUESTION:

I'm not sure what time T0 to T1 is, and I'd like confirmation 
of the other times shown above. Is T0 to T2 really between 1.5
to 2.3 mSec., I would have expected it to be a bit larger?

I was also wondering if there is a primary reference URL 
someone may know about that describes the times T0 to T4.

Thanks guys,
-- 
Peter Gargano