Não estou conseguindo configurar o modem 3COM para ADSL

Eu tinha um Modem da 3COM Dual Link que eu usava para acessar minha ADSL.
Porém cansei de alugar esse modem da Brasil Telecom e compre pra mim um 3COM HomeConnect 812.

Mas não to conseguindo configura-lo na minha máquina!!! :cry:
Repeti todas as configurações antigas nesse modem novo e tentei outros tipos de configuração e não deu certo.
O Log que o modem está gerando é esse:

Connection Event Log:
01/15/2001 22:16:39, ATM Link Down - Cell Delineation lost.
01/15/2001 22:16:39, PPP: Connection DOWN to Terra.
01/15/2001 22:16:39, CIP: Connection teardown initiated from far end on interface atm:1/vc:16
01/15/2001 22:16:39, CIP: The connection on if atm:1/vc:16 was dropped for Terra
01/15/2001 22:16:59, ATM Link Up - Cell Delineation detected.
01/15/2001 22:16:59, CIP: Sent a connect request to the driver for Terra @ (null) on interface atm:1
01/15/2001 22:16:59, CIP: Outgoing connection succeeded on interface atm:1
01/15/2001 22:16:59, CIP: The outgoing connection has been established on if atm:1/vc:16
01/15/2001 22:17:00, ATM Link Down - Cell Delineation lost.
01/15/2001 22:17:00, PPP: Connection DOWN to Terra.
01/15/2001 22:17:00, CIP: Connection teardown initiated from far end on interface atm:1/vc:16
01/15/2001 22:17:00, CIP: The connection on if atm:1/vc:16 was dropped for Terra
01/15/2001 22:17:20, ATM Link Up - Cell Delineation detected.
01/15/2001 22:17:20, CIP: Sent a connect request to the driver for Terra @ (null) on interface atm:1
01/15/2001 22:17:20, CIP: Outgoing connection succeeded on interface atm:1
01/15/2001 22:17:20, CIP: The outgoing connection has been established on if atm:1/vc:16
01/15/2001 22:17:21, ATM Link Down - Cell Delineation lost.
01/15/2001 22:17:21, PPP: Connection DOWN to Terra.
01/15/2001 22:17:21, CIP: Connection teardown initiated from far end on interface atm:1/vc:16
01/15/2001 22:17:21, CIP: The connection on if atm:1/vc:16 was dropped

Ele tb gera um Log, chamado "Critical Event Log":
At 22:17:55, Facility "DNS", Level "CRITICAL":: DNS Server request failued due to bad User Terra