Cisco 675 DSL Modem. Cisco 675 is an Asymmetric Digital Subscriber Line (ADSL) modem for home connectivity to an ADSL service provider network over an ADSL/Asynchronous Transfer Mode (ATM) physical layer. The Cisco 675 receives adaptive rates up to 7 Mbps downstream and transmits 1 Mbps upstream. A 10/100Base-T interface is provided for connection to a Ethernet LAN or Ethernet-equipped PC. The Cisco 675 supports Cisco Quick Dial technology for ADSL bandwidth-on-demand. Modem only.