Does the MT1932ZDX support 11 bit (word length) operation?

Yes, the 1932ZDX does support 11 bit with the latest 1.16 firmware.

You must enable 11 bit on both ends and you may need to set the parity bit also.

The command for 10 or 11 bit operaton is:

10 bits - $EB0 (default)

11 bits - $EB1

The command for parity is:

#P0 = no parity

#P1 = odd parity

#P2 = even parity

This modem is not flashable, so please contact Tech Support if you need the latest firmware.