Whilst on the subject of ONT power supplies, would you happen to know the acceptable tolerance of the 12 volt input? In particular, would it stretch to 13.8 volt on the high side?
(I have an ADS-B receiver which came with a 12 volt psu for its 12 volt marked power input. However, in its basic form it would work from a USB connection, my model also had a network option and apparently needed 12 volt. Opened it up and traced out the power components and found that the 5.0 volt rail was from a 5.0 volt regulator with a Low Drop Out spec. Using a variable output psu found that 6.0 volts was adequate for the network connection to work and a much cooler running receiver as a bonus.)
Cheers!
Clive
Andrews & Arnold Home::1 FTTP Technicolor DGA0122 Cisco ATA191 for A&A VoIP together with a HUAWEI E5776 with O2 Data SIM