So I am slightly unclear on what you are attempting to plug the the routers into. The OLT cable may look like a CAT5,5a,6,7 cable but it is not compatible with Ethernet. I believe that OLT connections are colored green and Ethernet should be yellow, blue or silver. A picture of the ports of the device might help. You could also have a bad or unsupported Ethernet cable. You want a Cat 5a at the very least.
ONT stands for Optical Network Terminal. It is an outlet to the Internet for fiber technology just like how a cable modem is the outlet for a coaxial cable Internet connection. It is a device that communicates directly with an Internet service provider (ISP) to get a fiber-optic Internet connection in your home or office. However, an ONT is specific to fiber-optic Internet so you cannot use an ONT with an Ethernet over coax or MoCA device like a cable modem, router or cable modem router, for example.
This page focuses on ONT, but there are other fiber technology abbreviations to know. The other abbreviations are:
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PON, which stands for Passive Optical Network. A PON is the “last stop” between you and your ISP. More specifically, the PON is the last part of the communication chain that reaches your home.
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OLT, which stands for Optical Line Terminal. An OLT is the device that serves as your ISPs endpoint of the PON. An OLT provides the interface between a PON and a service provider’s core network. For more, check out our OLT page.
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ONU, which stands for Optical Network Unit. This is a combo device that functions as both an ONT and OLT. That means an ONU acts as both the endpoint of the PON and as the interface for the user. For more, check out our ONU page.
Overall, a PON consists of an OLT at the service provider’s central office and a number of ONUs or ONTs near end users.