Adding to the above information...
Setting the Mode on an SFP+ or SFP+ MACSec Uplink Module (CLI Procedure)
SFP+ uplink modules are supported on EX3200 and EX4200 switches, and SFP+ Media Access Control Security (MACSec) uplink modules are supported on EX4200 switches. You can use these uplink modules either for two SFP+ transceivers or four SFP transceivers. You configure the operating mode on the module to match the type of transceiver you want to use—that is, for SFP+ transceivers, you configure the 10-gigabit operating mode, and for SFP transceivers, you configure the 1-gigabit operating mode.
By default, the SFP+ uplink module operates in the 10-gigabit mode and supports only SFP+ transceivers. If you have not changed the module from the default setting and you want to use SFP+ transceivers, you do not need to configure the operating mode.
To set the operating mode of an SFP+ or SFP+ MACSec uplink module:
Change the operating mode to the appropriate mode for the transceiver type you want to use by using one of the following commands:
[edit]
user@switch# set chassis fpc 0 pic 1 sfpplus pic-mode 1g
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user@switch# set chassis fpc 0 pic 1 sfpplus pic-mode 10g
(SFP+ uplink module only) If the switch is running:
Junos OS Release 10.1 or later, the changed operating mode takes effect immediately unless a port on the SFP+ uplink module is a Virtual Chassis port (VCP). If any port on the SFP+ uplink module is a VCP, the changed operating mode does not take effect until the next reboot of the switch.
Note: During the operating mode change, the Packet Forwarding Engine is restarted. In a Virtual Chassis configuration, this means that the Flexible PIC Concentrator connection with the master is dropped and then reconnected.
Junos OS Release 10.0 or earlier, reboot the switch.
You can see whether the operating mode has been changed to the new mode you configured by issuing the show chassis pic fpc-slot slot-number pic-slot 1 command.