I am pretty newbie with all these fibre optic stuff, but I hope that you have some time to help me out with this. I have easy customer with two HP 1820-48G switches installed.
Current situation is this:
I have bought two J4858C modules (Both genuine HP) and installed them to replace a CAT6 copper cable between switches. From the installed SPF modules I have wired an violet LC Multimode OM4 cable from module to panel.
- Floor 1: Half of the ethernet ports are used + SPF module is in port 49
- Floor 1: All ethernet ports are in use + SPF module is in port 49
The problem is, that there is no life at all. The switches wont even recognize those modules while hot swapping. Only indication of working module comes when I power cycle the swith. Then the down arrow on port 49 flashes once but then again -- nothing.
Questions
- Should I configure those switches somehow to get these SPF modules to work? Currently both of the switches are in default condition. No VLAN:n, no trunks.
- When I move my hand front of the installed SPF module without cable or shield - should I see the light on my hand? Yes, I know - Stupid newbie question, but I just need to know this. :D
- How important is the cable types (OM3-OM4) with this configuration?
- Should the normal ethernet between switches removed before the link works?