I've just asked my ZyXEL VMG1312-B10D to disclose the current values --
[Duo2 tmp]$ ssh admin@ap
admin@ap's password:
BusyBox v1.20.1 (2016-10-18 15:41:48 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.
$ xdslctl info --state
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 8000
Last initialization procedure status: 0
Max: Upstream rate = 980 Kbps, Downstream rate = 5832 Kbps
Bearer: 0, Upstream rate = 963 Kbps, Downstream rate = 5120 Kbps
$ Connection to ap closed.
[Duo2 tmp]$
Using the "Bearer" synchronisation speed (and not the predicted "Max" synchronisation speed) for the circuit I find a ratio of 963 / 5120 = 0.188
Now a throughput speed test, noting that the time is currently 1812 hours --
[Duo2 tmp]$ speedtest_cli --help
Usage: speedtest_cli [options]
Command line interface for testing internet bandwidth using speedtest.net.
--------------------------------------------------------------------------
https://github.com/sivel/speedtest-cli
Options:
-h, --help show this help message and exit
--bytes Display values in bytes instead of bits. Does not affect
the image generated by --share
--share Generate and provide a URL to the speedtest.net share
results image
--simple Suppress verbose output, only show basic information
--list Display a list of speedtest.net servers sorted by
distance
--server=SERVER Specify a server ID to test against
--mini=MINI URL of the Speedtest Mini server
--source=SOURCE Source IP address to bind to
--timeout=TIMEOUT HTTP timeout in seconds. Default 10
--secure Use HTTPS instead of HTTP when communicating with
speedtest.net operated servers
--version Show the version number and exit
[Duo2 tmp]$ speedtest_cli --version
0.3.4
[Duo2 tmp]$ speedtest_cli --simple
Ping: 61.411 ms
Download: 4.33 Mbit/s
Upload: 0.79 Mbit/s
[Duo2 tmp]$ speedtest_cli --simple --secure
Ping: 60.637 ms
Download: 4.34 Mbit/s
Upload: 0.80 Mbit/s
[Duo2 tmp]$
Using the latter throughput values I find a ratio of 0.80 / 4.34 = 0.184
So let's say the ratio is between 0.18 - 0.19 for my circuit, operating in G.992.3 mode.