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USRobotics Corporation Limited Warranty

USRobotics ADSL Ethernet Modem User Guide



The ADSL Ethernet modem provides home connectivity to an ADSL service provider network over an Asynchronous Transfer Mode (ATM)/ADSL physical layer. It receives adaptive rates of up to 8Mbps downstream and transmits 640Kbps upstream.

System Features

This section introduces the system features of the ADSL Ethernet modem.

Standards Compliance:

  • ITU-T G.992.1, G.992.2, and ANSI T1.413 Issue 2
  • Handshake Protocol: defined in ITU-T G.994.1
  • IEEE 802.3 10BaseT physical layer specification

Hardware Features

  • Discrete Multi-Tone based ADSL physical layer.
  • Rate adaptive with maximum downstream data rates up to 8Mbps and upstream data rate up to 640Kbps.
  • 10BaseT Ethernet interface, compliant with IEEE 802.3.
  • Status LEDs indicating Ethernet and ADSL activity.
  • Restart and operate automatically after the input power is restored from a power failure.
  • Management console support.

Software Features

Multiple data encapsulation formats support

  • RFC 2364 PPP over ATM AAL5
  • RFC 2516 PPP over Ethernet with third party client
  • RFC 1483 (bridge and routing mode) multi-protocol encapsulation over ATM AAL5
  • RFC 1577 Classical IP and ARP over ATM

ATM support

  • ADSL physical connection supports ATM AAL5
  • Support for 8 PVCs
  • End-to-end OAM loopback

Network Access

  • IP routing protocols: Static routing and RIPv1, v2
  • 802.1d transparent bridging
  • DHCP server automatically assigns IP addresses to PCs on the LAN
  • NAT enables multiple PCs on the LAN to access the Internet via single public IP address

Network management

  • Web-based configuration software
  • TFTP firmware upgrade and configuration backup and restore
  • TELNET server for remote management
  • SNMPv1 agent
  • MIBs support with RFC1213, RFC1493 (bridged mode only), RFC1573, RFC2662


  • password protected system management terminal
  • PAP/CHAP authentication for PPP mode

Environmental Constraints

This ADSL Ethernet modem should be operated in an ambient temperature environment of 0 to 50 degree C. The Ethernet modem should be stored in an ambient temperature environment of -10 to 70 degree C and relative humidity in the range of 10% and 90% non-condensing.