The DSL501 / DSL504 
        integrates ADSL modem, firewall, router and Ethernet connectivity into a 
        single compact unit. Complying to the new generation of ADSL technology 
        in ADSL2, these modems are able to deliver high-speed Internet access up 
        to 12Mbps*, making watching on-line movie, downloading music and on-line 
        gaming quick and smooth.
        With the integrated 
        router, a single Internet connection can be shared to multiple 
        computers. The DSL504 is equipped with a 4-port Ethernet switch that can 
        connect directly up to 4 computers, while the DSL501 has a single Ethernet 
        port for connecting to existing network.
        Both models are 
        equipped with advanced security functions including NAT, SPI firewall, 
        Denial of Service (DoS) attack protection and IP filtering.
        *ISP support required