For console sessions:
speed baudRate
no speed
For Ethernet interfaces on line modules:
speed speedValue
no speed
Command introduced before JunosE Release 7.1.0.
When used from Line Configuration mode, sets the speed for the current and all new console sessions immediately. The no version reverts to the default value, 9600 bps.
When used from Interface Configuration mode, specifies the line speed for an Ethernet interface. This command works with the duplex command; if you set or accept the automatically negotiate setting for either duplex mode or speed, the router negotiates both parameters with the remote device. The no version specifies the default, automatically negotiate or 100 Mbps (FE-8 SFP I/O module only). This command is not available for the Ethernet interface on the SRP module.
Interface Configuration, Line Configuration