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Glossary Section "F" ( Definitions ) Guide - Select
first letter of word: FAX Facsimile FC is a common type of connector used on both multi-mode and single-mode fiber optic cable. To connect you insert the tip and screw on the outer threaded collar. (picture of FC connector) FDM Frequency Division Multiplexing Firewalls are be a combination of hardware and software designed to prevent unauthorized access to the local LAN. In many cases they filter messages containing unwanted content. four-wire circuits Telephone lines using two wires for transmitting and two wires for receiving offering much higher quality than a 2-wire circuit. All long distance circuits are 4-wire. Almost all local phone lines and analog phones are 2-wire. FQDN Fully Qualified Domain Name The FQDN is the full name of a system, rather than just its host-name. For example, "central" is a hostname and "central.room1.com" is an FQDN. Frame Relay is a packet-switching protocol that provides features like that of a dedicated DDS or T1 network, but without the expense of multiple dedicated circuits. Frame Relay is deployed over the same services used to deploy DDS and T1. Frame Relay circuits are connected to a packet switch within the network that ensures packets are routed to the correct location. Frame Relay is an ideal, cost-effective solution for networks with bursty traffic that require connections to multiple locations and where a certain degree of delay is acceptable. FRAP Frame Relay Access Probes help benchmark the performance of frame relay networks. FSK Frequency Shift-Key Modulation FSO Free-Space Optics is a point-to-point technology that transmits laser beams over the air to provide a very high-speed communications link. FSO requires line-of-sight between two transceivers to transmit voice, video, and data on beams of light at speeds up to 2.5 Gbps. Another name for Free Space Optics is “Optical-Wireless”. FTAM File Transfer, Access, and Management. The OSI remote file service and protocol. FTP file Transfer Protocol. The Internet protocol (and program) used to transfer files between hosts. Full Duplex Data flows in both directions at the same time. FX Foreign Exchange provides service from the customer's station to a Central Office other than the one which would normally serve that station. FXO Foreign Exchange Office. This is the office end of an FX circuit (frequently a PBX). FXS Foreign Exchange Station. The station (telephone) end of an FX circuit. An FXS port will provide dial tone and ring voltage. [return to guide] [home page] [specials] [suggest new words for glossary]
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