The ERX-1440 router with the SRP-40G+ SRP module supports GE-2 line modules in all slots; however, full bandwidth is delivered only when the line module is in slot 2 or slot 4. The line module can be used with other SRP modules, but maximum line performance will not be achieved.
The ERX-310 router with the SRP-SE10G SRP module supports GE-2 line modules in both slots (1 and 2). Maximum line performance is achieved in either slot.
Other ERX routers do not support GE-2 line modules.