Could you point how to check if a internet modem/ instalation is using Optical Fiber in oposition to a coaxial cable?

optical cable is more immune to electromagnetic noise and has the capability of a higher bandwidth than cable. In my docsis modem I am using 12 channels for download and 3 for upload. Fibre would only be one channel up and one down.

With cable as the speeds go up the more channels are required as each channel has a fixed amount of bandwidth.  enabling/disabling channels is one way of the isp to limit your speeds

Ok.

But at this time I need the phisical - visual - characteristics of each one to be sure I'm receiving the correct devices.... to have the correct contracted services.

A site diagnosys to evidence what kind of connection is running also... if possible.

Thank you.