What OSI Layer is an ONT (Optical Network Terminal / Motorola, Alcatel, etc)

Hi Everyone,
This is just an inquiry for entertainment purposes as I am studying for a CCent:

What OSI/TCP.IP Layer does a triple play, optical network terminal reside at?

I have a feeling that this is nearly going to sound like a trick question.

Any answers will be appreciated!

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ptilsen

Based on some cursory glances at an infallible source, it seems to me that an ONT or similar device is unquestionably a layer 1 device.

To expand on that, it appears such a device does nothing more than demultiplex the signal, a process which does not include any specific network functionality, ie considering MAC or IP addresses.

it_consultant

The specific terminology is a little vague.

This is what I found when I googled it:

What is ONT: Optical Network Terminal? Verizon Online FiOS FAQ | DSLReports.com, ISP Information

A simple device that converts the light into a copper signal, you will see people use things called "omnitrons" which do the same thing - all layer 1. There are optical networking chassis by Cisco and the like which can terminate a fiber ring for FDDI or SONET purposes which work at layer 1 through 4 depending on how it is configured.