Fujitsu FMW4503TS128A01 manual Register Table

S38	56K Dial Line Rate
	=0	56K disabled		3
	=1	56K enabled - automatic speed selection - maximum
		modem speed.
	=2	32000 bits/s
	=3	34000 bits/s
	=4	36000 bits/s
	=5	38000 bits/s
	=6	40000 bits/s
	=7	42000 bits/s
	=8	44000 bits/s
	=9	46000 bits/s
	=10	48000 bits/s
	=11	50000 bits/s
	=12	52000 bits/s
	=13	54000 bits/s
	=14	56000 bits/s
S91	Line Transmit Level.		-dBm	14	9-15
	This register is effective only for Japan.

S Register Table 89