The standard, ITU G.9903, shows a theoretical data rate in table 7.8 (see below for a replication of this table), assuming that PHY frames are transmitted back to back without any gap.
Data rate for various modulations (excluding FCH) (from ITU G.9903):
FCC Number of symbols | Data rate (bit/s) D8PSK (Note1) | Data rate (bit/s) DQPSK (Note1) | Data rate (bit/s) DBPSK (Note1) | Data rate (bit/s) Robust (Note2) |
---|---|---|---|---|
12 | 152,899 | 95,957 | 39,015 | 4,217 |
20 | N/A | 138,135 | 61,864 | 11,016 |
28 | N/A | 166,469 | 72,213 | 15,584 |
NOTE 1 -- Reed-Solomon with a 16 byte parity. NOTE 2 -- Reed-Solomon with an 8 byte parity. |
For longer PHY frames (higher number of symbols) the difference between theoretical and actual data rate will be minor.
Also according to ITU spec minimum IFS has to be 10 symbols or 2.3ms.