Force Wireless G or N only modes BEbox v2

I'm currently using the bebox v2 (speedtouch 582n) and want to force G or/and N modes only but theres no option in the gui anyone got some telnet commands for me?

You can disable wireless n with telnet but not b or g.
Commands here http://npr.me.uk/telnet.html

There is a CLI guide for 582n which I thought I got from the BE web site thought I can't find it now. There is a CD though which may well have the manual on it.

The way I understand it you could have b only, g only but not n only:

wireless ifconfig [state = <{enabled|disabled}]>
[channel = <{auto|1|2|3|4|5|6|7|8|9|10|11|12|13}]>
[ssid = <quoted string]>
[any = <{enabled|disabled}]>
[interop = <{802.11b|802.11b(legacy)/g|802.11b/g|802.11g|802.11b/g/n}]>
[frameburst = <{disabled|enabled}]>
[frameaggregation = <{off|ampdu|amsdu}]>

I've found i can only get B/G but not G/N

I was curious as to why you cared?