USRobotics U.S. Robotics SureConnect ADSL Ethernet/USB Router manual

U.S. Robotics SureConnect ADSL Ethernet/USB Router User Guide

ESP (Encapsulating Security Payload) – ESP provides confidentiality. Optionally, ESP also provides integrity, authentication, anti-replay service, and limited traffic flow confidentiality. Options selected at the time of Security Association establishment determine provided services. For confidentiality, shared ESP supports shared key encryption algorithms, such as DES and Triple DES.

F

Filter - Operating parameter used in LAN bridges and routers. When set, the filter causes bridges and routers to block transfer of packets between LANs. The term "filter" also applies to a hardware device, such as a microfilter. When installed, this device reduces interference between DSL signals and telephone signals.

Forward Delay Time - Timeout value employed by all bridges in the bridged LAN.

The root sets the forward delay value.

FM (Frequency Modulation) Modulation method used by modems, radio, and DSL equipment. The signal modulates or alters the frequency or pitch of the carrier. In regular FM, the carrier is a sinewave. The frequency of the modulated carrier changes in proportion to signal amplitude. FM creates an infinite number of sidebands. These sidebands contain the signal data. With an equivalent signal, FM tends to require more bandwidth than AM does. FM's advantage is that it’s less subject to impulse noise and static than AM is.

Frame - Variable length information unit that contains packets. Also refers to a transmission frame, a fixed-length unit that carries bits across a physical link. A transmission frame is a framed transport component. DSL technologies use frames. Also refers to a frame of video, one image in a video sequence

G

Gateway - Entrance to and exit from a communications network.

G.DMT - The ADSL standard approved by the International Telecommunications Union (ITU). G.DMT indicates full-rate ADSL, which provides standards for higher speed ADSL than G.Lite. G.DMT provides maximum data rates of 8 Mbps downstream from the subscriber and 1.5 Mbps upstream from the subscriber.

G.lite - Standard way to install Asymmetric Digital Subscriber Line service. Over regular phone lines, G.Lite makes possible Internet connections to home and business computers at up to 1.5 Mbps. Officially known as G.992.2.

H

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