(6/n)
And we get a nice little UI as a result!:
1. A spectrum analyzer with configurable center frequency/bandwidth span
2. Per-downstream-channel plots of Power (in dBmV - remember characteristic impedance is 75Ω here) and Modulation Error Ratio (in dB) over time
3. Constellation diagrams of any of the active downstream QAM channels!

These are pretty cool - someone has done some good work in developing this feature. Lots of companies simply got rid of the spectrum analyzer functionality in their modems instead of fixing the bug after the Cable Haunt (https://github.com/Lyrebirds/Cable-Haunt-Report/releases/latest/download/report.pdf) vulnerability came out a few years ago, which is a shame since it's such a great learning and debugging tool. So I'm happy to see Hitron is actually working on adding this functionality to a modem that didn't have it yet.
#electronics #docsis #cablemodem

(5/n)
The "Spectrum" hidden tab is a little more complicated - the javascript isn't just grabbing some data from a .asp page and displaying it in a table, it's a whole application with buttons and fancy graphs. So I figured out a devtools javascript console incantation to get the main page to load it, ignoring the fact that it's marked as not visible:
```js
$('#maincontent').html('');
var loadPage = "advanced_spectrum.html"
$('#maincontent').load(loadPage, function(response,status){
if (status=="success") {
$("a").unbind("click");
}
});
$('#maincontent').fadeIn();
```

(This is basically ripped from /js/mainApp.js, lines 305-321)
#electronics #docsis #cablemodem