Accessing modem speeds when using D6200 solely as a modem

[bowler]

I have searched but not found any relevant information, I need to be able to look at the link speed between the D6200 modem and my local exchange, I keep having problems where the connection drops and reconnects at a slower speed.

When I used the D6200 to provide router access I could always see it but i have now added an Orbi to get better coverage throughout the house, and it now only shows the LAN throughput.

Is there a way to interogate the D6200 when used solely as a modem.

Many Thanks in advance.

[michaelkenward]

Using a D6400 in modem only mode, I haven't found a way of getting into the modem's settings.

Some ISP's have their own tools for testing connections. Would that work?