Specify data flow format that is sent to RADIUS server. The value
SHOULD be set the same as the value of corresponding server.
1 (byte) - Specify 'byte' as the unit of data flow.
2 (kiloByte) - Specify 'kilo-byte' as the unit of data flow.
3 (megaByte) - Specify 'mega-byte' as the unit of data flow.
4 (gigaByte) - Specify 'giga-byte' as the unit of data flow.
Default value is 1.