Canon FAX-L1000 - Manual (Page 222)

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FAX-L1000 Chapter 3: Technical Reference
NOTE
1. The V.34 protocol uses ECM. If the ECM SW in user data is set to OFF,
the V.8 protocol is not executed. Therefore, the V.34 protocol is not used,
and V.17 or a lower protocol is selected.
2. If the transmission speed is set to 14400 bps or lower, the V.8 protocol is
not executed and V.17 or a lower protocol is selected.
3. After the V.21 protocol is selected first, it can be changed to V.8 or V.34.
(See c-1) )
4. When the V.34 protocol begins, it falls back within the V.34 protocol, but it
does not fall back to the V.17 mode or lower.