Hi all,   First of all I'm sorry for my poor english : I'm french.   1- servers room link : I have an MS420-16 linked with a MS350-24X by aTwinax Cable with SFP+ Connectors in my main servers room and a MS350-24X in my backup servers room. the two rooms are linked with an old fiber optical link at 1Gb speed. My manager finally ordered a new fiber optical link to connect those two servers rooms with a better speed. The future link will be an OM4 LC/LC 574 feet long (175 meters). The provider sell us this link as a 10Gb speed link. I read that OM4 can speed up to 40 Gb. My question is : what max speed can I obtain between my twoo rooms and witch transceivers do I order to link my MS420-16 and my MS350-24x at full speed ?   2- secondary network bays : We are contructing a new facility and a new network bay will be installed. the same provider as in first point will link my two facilities with a OM4 LC/LC. the two facilities have MS350-24P switches. witch SFP+ 10Gb transceiver do I order to link these two switches ?   I hope that I am clear in my explanations.   Thank you in advance for your expertise and your time. Cedric.   edit : I have made a typo, it's not a MS-420-16 but a MS-425-16. If I make no mistake it has two 40G QSFP+ interfaces. ... View more