Hi, It's an ER4 , LR4 is just the label precision coded for compatibility. The module part name is PRE-QSFP-ER4 2017-10-04 19:57 GMT-03:00 Aaron Gould <aaron1 at gvtc.com>: > Hey that’s good to know Gustavo… but LR4 , is that shorter than 40 km ? > > > > -Aaron > > >