Quantic PMI model PVGA-500M4G-8CH-ENET-3U-SFF is a chassis containing 8 variable gain amplifiers with the ability to individually terminate unused input ports internally into 50 OHMs. Ethernet control sets the gain attenuation in 0.25 dB steps up to 32 dB. The minimum gain is 50 dB with 0 dB of attenuation selected.