compatability copperjet 810 modem with apple airport express

Dear moderator,

with interest I have read and searched this forum looking for an answer to my question, sadly I didn't find it. Would you please help me?

This is the thing:
setup now:
splitter - ADSL - modem(Copperjet 810) - LAN ethernet cable - notebook Windows XP.

future setup:
splitter-ADSL-modem (Copperjet 810) - ethernet cable - Apple airport express (wireless g) -
1. notebook (intel celeron M chip with integrated wireless g card) and
2. notebook macbook mac OSX with intergrated wireless g

I tried this setup with the linksys wrt 54G. It failed because the Copperjet modem only "spoke" with 10Mbps and was not compatible with the 10/100Mbps that the Linksys used.

Is the apple airport express capable of my proposed setup?

Many thanks,

Michiel.