Connecting to the optical equipment
The devices are attached by ethernet to the gateway in PB8. The only computer that can access the gateway (for us) is epldt114 (to which you can ssh via eprexa if needed)
VIAVI optical mainframe
Open browser and navigate to http://eplgw3 (this requires not just port 80=http to be forwarded but a whole pile of about 5 more ports that are listed in the appendices of the instruction manual)
Optical to electrical converter
Open browser and navigate to http://eplgw3:8081
If you're interested...
If you want to open from your laptop connected to the wifi, you can just set up a SOCKS proxy to the gateway e.g. ssh -D 9999 -J eprexa eplgw3 -N
(if you're on eduroam the -J causes you to ProxyJump through eprexa) and then configure your browser appropriately e.g. chromium --proxy-server="socks5://localhost:9999"
or via firefox about:preferences Network Settings fields for a SOCKSv5 proxy