How can I do SNR tweak for Netis dl4323?

How can I SNR tweak for netis dl4323? yes I can telnet into the router but it doesn't recognize the command "wan". (I checked the post for SNR tweak)

login as: guest
guest@192.168.1.1's password:

$wan
cmd "wan" error, expecting:
<press Enter>
config              config system
debug               debug setting
diagnostic          diagnostic mode
exit                exit from current mode
reboot              reboot system
sh                  enter shell mode
show                show system information
$

update found this:

$show wan
cmd "wan" incomplete, expecting:
adsl                ADSL setting
atm                 ATM setting
droute-mode         default route mode selection
interface
$