The Zoom ADSL Modem USB Model 5510 is a multi-mode Asymmetric Digital Subscriber Line (ADSL) data modem that delivers up to 8 Mbps data transport over existing copper wire lines. The Zoom ADSL Modem supports a wide range of ADSL line codes. An adaptive data rate capability can automatically set transmission speed using algorithms that detect the signal quality of the telephone line. The variable data rate and line code capability supports a broad range of infrastructure conditions, including loops with bridge taps, significant crosstalk, and AM radio interference. Downstream and upstream data rates can also be fixed with a manual mode. The Zoom ADSL Modem USB is designed for easy consumer installation through a Windows 98 or Windows 2000 computer's USB port. The Zoom ADSL Modem USB is capable of transmission of ADSL without disturbing phone service on the same telephone line or transmission of ADSL without disturbing ISDN on the same ISDN line. Additionally, the Zoom ADSL Modem is software upgradeable to support service and performance enhancements. The ITU line codes supported include ANSI T1.413 issue 2, G.DMT (ITU G992.1), G.Lite (ITU G992.2). No external voice/data splitter is required in G.Lite mode.