hmm, looking at the specification on that the 3com site says:
Quote:
System Requirements
Computer with an Ethernet 10BASE-T, 10/100, or 10/100/1000 interface configured for Internet communication <snip>
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In other words it is designed to connect to a PC, the PC itself then having a connection to the cable modem via a second NIC. That seems to be what all the wiring diagrams in the user guide indicate too
The intention for your network would need to be:
Cable modem > Gateway PC (this PC must always be on) NIC #1
NIC #2 > 3com access point
3com access point > wireless > other PC wireless adaptors.
If possible, assuming you just purchased the item, take it back to the shop, saying it is unsuitable for purpose because it's incomaptible with the ntl network for which it is purchased. Otherwise you might just have to swallow your pride and flog it on ebay.
edit: if you were to wire up in the way I suggest above, then you would need to fiddle with the settings on the gateway PC to allow the internet connections to be shared. It would allo get much more complex than I think you were hoping for.
It looks like by default the IP range of the access point is 192.168.1.xxx. If you wish to keep experimenting with IP settings for fixed points in your network card use that range.
What you really need, I suspect is a Wireless Access Point Router.