Terms used as applied to Data (and some Voice) Transmission over Copper Wire

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Fire Wall
Frame Relay












FDDI (Fiber Distributed Data Interface) -- A standard for transmitting data on optical fiber cables at a rate of around 100Mbps -about twice as fast as T3.

Fire Wall-A combination of hardware and software that separates Networks, or LAN's into two or more parts for security purposes

Firewire See IEEE-1394

FRAD (Frame Relay Access Device) -- FRAD, sometimes referred to as a Frame Relay Assembler/Dissembler, is a box that encapsulates (puts frame relay header and trailer information on) outgoing data packets and decapsulates (removes frame relay headers and trailers from) incoming packets. Since frame relay does not take responsibility for error detection, the FRAD sometimes includes error detection. The FRAD is a box, usually close to the user, that provides the interface between the user and a network that uses frame relay. The FRAD is sometimes included as part of a router. See: Frame Relay

Frame Relay A DTE-DCE interface specification based on LAPD (Q.921), ISDN version of LAPB (X.25 datalink layer). This specification that originally produced by a consortium of StrataCom, Cisco, DEC and Northern Telecom.

Frame relay is a system in which data (in the form of packets) from different protocols such as Ethernet, X.25, and the Internet Protocol (IP), is collected into "frames" or larger units of transmission that are delivered in burst-like mode over a switched connection that is, however, a "permanent virtual circuit" (PVC). A PVC ensures that packets always arrive in the right order so that they can be reassembled successfully. See: ATM, FRAD

Fractional T1 (FT1)

FXO (Foreign eXchange Office) -- A MUX that Connects to POTS lines that come from a CO and converts to E1 or T1. Basically does the opposite of FXS lines.

FXS (Foreign eXchange Subscriber) -- A MUX that feeds out POTS lines for connection to a normal telephone set- which is usually converted from E1 or T1. Basically does the opposite of FXO lines

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