269Usage guidelinesThe primary profile always has priority over the backup profile. For each dialup connectionestablishment, the 3G modem uses the backup profile only whenit has failed to dial up using theprimary profile.You must configure the same user name and password for the primary and backup profiles.This command takes effect only on dialup connections initiated after the command is configured. Itdoes not take effect on a dialup connection that has been established.Examples# Specify the profiles numbered 1 and 2 as the primary and backup profiles, respectively.system-view[sysname]interface Cellular 2/4/0[sysname-Cellular2/4/0]profile main 1 backup 2serial-setUse serial-set to channelize a cellular interface into a synchronous/asynchronous serial interface.Use undo serial-set to delete a synchronous/asynchronous serial interface channelized from acellular interface.Syntaxserial-set set-numberundo serial-set set-numberViewsCellular interface viewPredefined user rolesnetwork-adminParametersset-number: Specifies the serial interface number.Usage guidelinesThe command names the serial interface as serial cellular-number:set-number.Examples# Channelize Cellular 2/4/0 into a serial interface. system-view[Sysname] controller cellular 2/4/0[Sysname-Cellular2/4/0] serial-set 0wcdma bandUse wcdma band to specify a WCDMA frequency band.Use undo wcdma band to restore the default.Syntaxwcdma band { wcdma800 | wcdma850 | wcdma900 | wcdma1700ip | wcdma1700us |wcdma1800 | wcdma1900 | wcdma2100 | wcdma2600 }undo wcdma band
