Telecommunications Glossary of terms used on this site

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Term Definition

A Frame Check Sequence, or FCS, is present when extra characters are added to a frame for the purpose of error control, and is utilized in High-Level Data Link Control (HDLC), Frame Relay, and other Data Link Layer (DLL) communication protocols.

Aliases (separate with |): Frame Check Sequence

Frame Delay


Facility Data Link


Frame Delay Variation


Full Duplex


Frame Error Ratio


Fixed Filter, or FF, is a reservation style which creates a distinct reservation for traffic from each sender, with common usage for applications in which traffic from each sender is likely to be concurrent and independent. When FF is employed, the total amount of reserved bandwidth on a link for sessions is equal to the sum of the reservations for each sender.

Aliases (separate with |): Fixed Filter

Forwarding Information Base, or FIB, is a data structure and means of forwarding management in which destinations and incoming labels are associated with outgoing interfaces and labels.

Aliases (separate with |): Forwarding Information Base
Fixed Wireless

Fixed wireless or FW is a point to point or P2P method of establishing communications between two endpoints using fixed or stationary, radio or microwave type devices or technologies, and an alternative to leased line, wired, copper, fiber or satellite based connections. Typically, commercial fixed wireless communications operate within a licensed frequency bandwidth to provide higher connection speeds and ensure quality of service or QoS, but alternatively, may operate in an unlicensed radio spectrum including 900 MHz, 1.8GHz, 2.4 GHz and 5 GHz.

Aliases (separate with |): FW

Frame Loss Ratio

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