system# isainfo -v
Determine whether your system has already loaded the STREAMS module.
system# modinfo | grep modulename
If the STREAMS module, such as u8lat1, is already installed, the output looks as follows:
system# modinfo | grep u8lat1 89 ff798000 4b13 18 1 u8lat1 (UTF-8 <--> ISO 8859-1 module)
If the module has not already been loaded, load it using the modload(1M) command.