Telnet to the router as follows:
c3:~ matt$ telnet x.x.x.x
Trying x.x.x.x...
Connected to x.
Escape character is '^]'.
Password: xxxxxxxxxxx
Type ? for command help
> adsl status
--------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
Running Mode : ADSL2+(G.992.5) State : SHOWTIME
DS Actual Rate : 22760596 bps US Actual Rate : 1019968 bps
DS Attainable Rate : 22948000 bps US Attainable Rate : 1224000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 10 dB Cur SNR Margin : 6 dB
DS actual PSD : 19. 3 dB US actual PSD : 11. 8 dB
ADSL Firmware Version : 232201_A
-------------------------------- ATU-C Info ---------------------------------
Far Current Attenuation : 4 dB Far SNR Margin : 14 dB
CO ITU Version[0] : 00004946 CO ITU Version[1] : 0000544e
DSLAM CHIPSET VENDOR : < IFTN >
So,
adsl status is what you need.