Alcatel SpeedTouch / Cisco Routed IP query

Does anyone have an example .ini file for an Alcatel Speedtouch DSL
modem configured for routed IP (ao opposed to NAT/PAT) they can let me
have. We have just bought a PIX 501 firewall, and want to put it
directly behind the Alcatel. Or is it a better idea to connect the PIX
to our ISP directly, as the PIX can apparently do the PPPoE that the
Alcatel does....Any replies gratefully accepted, direct to me please -
I'll summarise to the list: joe dot green at oakwood-dc.com