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ONT: Optical Network Terminal
An ONT is a media converter that is installed by Verizon either outside or inside your premises, during FiOS installation.
The ONT converts fiber-optic light signals to copper/electric signals.
• 1490 nm voice/data receive
• 1550 nm video receive
Each ONT is capable of delivering:
• Internet data
For a list of various ONTs, see: »Verizon Online FiOS FAQ »What are the different models of ONTs?
Your existing inside wiring for telephone, internet and video are connected to the ONT during installation.
The following picture shows typical connections and status indicators at the ONT:
Click to enlarge
From left to right, RJ45 WAN connection, two POTS connections and coax connection
Video (except VOD) is always on coax
For MOCA capable ONTs. internet can be delivered over either coax or cat-5.
Verizon's standard residential installation is coax from the ONT to the STBs and router.
Chances are the other boxes you see are part of the backup batery system which overall provides power to the ont. The wires you see coming from this box to the ont which is the bigger unit are power wires. Some APC power supplies have multiple wires one of which is used for power and one that is often communication to allow the service provider to see if you are on backup battery power at the time thus indicating there is a problem with the power source. The third box is probably the digital cable switch. Some companies are going with ip tv or internet tv which means there has to be a convertor of some sort to convert the very low frequency digital signal to work with your basic cable lines.
What are names that Verizon uses for the each of the three boxes and all three boxes as a unit. Box 1 is the one you show on the page, but there are 2 others that seem to just supply power for the box you show. I think Box 1 show be called ONT, but perhaps all three together called ONT as well. In my case Box 1 is outside the house and high enough so I can't look at it closely. Box 2 holds the battery and has a cable from box 1 and a cable to box 3. I don't know what to call this box. Do you have a name for it? There is a cover that is removable without tools. The battery is in there. I don't have the specific information on the battery. There is also some electronics. Running down the right hand side of Box 2: Verizon logo button Alarm Silence button Battery Emergency Use light Auxiliary (Normally off) Power Source light Replace Battery (Normally off) light Battery Power (Normally off light System Status (Normally green) In my case Box 2 also has jack for "Auxiliary Power Supply DC 12V". I haven't found specific information for the acceptable input voltage or parity. In other words, I can't tell if a "12 Volt" automobile battery is acceptable, but the internal battery seems to be acid lead, so I think it would be OK. A label on Box 2 says 0910-0067 REV 1A and has a serial number AT12B304nnnn (Actually the label says "REV 1B", but a smaller label has been put on top of the revision label so it say "REV 1A") Box 3 is the "Power Supply" and has a green light labeled "Power OK" on it. My box 3 has a label saying 0010-0066 REV 1A and a serial number AT02B303nnnn It has a cable going to box 2 and a power cord going to an AC outlet. The above is in reference to http://www.dslreports.com/faq/12565, "What is ONT: Optical Network Terminal? (#12565)"
The other two boxes (usually mounted indoors) are the BBU (battery back-up unit) and OPSU (ONT Power Supply Unit.) The OPSU provides commercial AC power during normal operation, and the BBU will provide back up during power failures. The cables you see coming out of the BBU are to provide status (LED and alarm) indications when a failure occurs (e.g. power failure, or battery needs to be replaced.)