A drop in sync of that amount is often the result of Interleaving being turned on instead of Fast Path. Are there any stats from it that include the Bearer 0 part below?

Max:    Upstream rate = 14745 Kbps, Downstream rate = 58464 Kbps
Bearer: 0, Upstream rate = 14391 Kbps, Downstream rate = 59418 Kbps

Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode(0x0)
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        5.9             6.4
Attn(dB):        19.5            0.0
Pwr(dBm):        13.5            7.4
                        VDSL2 framing
                        Bearer 0
MSGc:           18              26
B:              239             237
M:              1               1
T:              64              62
R:              0               16
S:              0.1285          0.5260
L:              14936           3863
D:              1               1
I:              240             127
N:              240             254

First thing that strikes me is this:

In reply to a post by gf20:

DSL Uptime 0 days 0 hours 25 minutes 51 seconds

Assuming that's related to the time of your post, it's seldom a good idea to sync a modem at night if you can avoid it- too much interference from medium wave radio transmitters in particular and street lights etc.

Best time is usually in the morning, but anyway in daylight. Try again tomorrow.

Unfortunately thats the only DSL stats i've been able to find so far

Interestingly I reconnected the Openreach modem on its own about half a hour ago and ran a BT Speedtest which showed the profile as 30.76mbps which I think works out at around 31mbps

It's possible the ASUS supports telnet, (which if you are on Windows may need enabling).

Those stats I gave tend to only be available that way. Once you get into the router that way you are looking for a command such as
xdslcmd info --stats where the "x" may be an "a".

My RT-N66 doesn't support telnet:

iMac-3:~ billford$ telnet 192.168.1.1
Trying 192.168.1.1...
telnet: connect to address 192.168.1.1: Connection refused
telnet: Unable to connect to remote host

I just tried with my RT-N66U. First try zilch. Then checked the GUI and in Administration there is an Enable telnet option.

RT-N66U login: admin
Password:

ASUSWRT RT-N66U_3.0.0.4 Wed Sep 11 07:34:01 UTC 2013
admin@RT-N66U:/tmp/home/root# sh
admin@RT-N66U:/tmp/home/root# ?
sh: ?: not found
admin@RT-N66U:/tmp/home/root# /?
sh: /?: not found
admin@RT-N66U:/tmp/home/root#

.

In reply to a post by RobertoS:

Then checked the GUI and in Administration there is an Enable telnet option.

So there is, I'd never noticed that

Thanks

With vdsl2 it is more shortwave that will be an issue

True, brain wasn't working properly.

If you find any commands, preferably how to list them, that would be good to know .