Acronym for frequency-hopping spread spectrum. FHSS is one of two types of spread spectrum radio, the other being direct-sequence spread spectrum. FHSS is a transmission technology used in LAWNtransmissions where the data signal is modulated with a narrowband carrier signal that “hops” in a random but predictable sequence from frequency to frequency as a function of time over a wide band of frequencies. The signal energy is spread in time domain rather than chopping each bit into small pieces in the frequency domain. This technique reduces interference because a signal from a narrowband system will only affect the spread spectrum signal if both are transmitting at the same frequency at the same time. If synchronized properly, a single logical channel is maintained.
The transmission frequencies are determined by a spreading, or hopping, code. The receiver must be set to the same hopping code and must listen to the incoming signal at the right time and correct frequency in order to properly receive the signal. Current FCCregulations require manufacturers to use 75 or more frequencies per transmission channel with a maximum dwell time (the time spent at a particular frequency during any single hop) of 400 ms.
Short for Fiber Connection, or Fiber Connectivity, IBM��s fiber optic channel technology that extends the capabilities of its previous fiber optic channel standard, ESCON. Unlike ESCON, FICON supports full duplex data transfers and enables greater throughput rates over longer distances. FICON uses a mapping layer that is based on technology developed for Fibre Channel and […]
Short for Fractal Image Format, a graphics file format from Iterated Systems, Inc. that uses fractal geometry to compress images. (Fractals are structures possessing similar-looking forms of many different sizes. They can be used to create any real-world object, like a mountain or a cloud, provided it doesn’t correspond to a simple geometric shape.) These […]
Acronym for Financial Services Instant Messaging Association, FIMA is made up of a number of leading Financial Institutions from both the buy-side and sell-side, and is open to any banking organization that would like to participate. FIMA is dedicated to understanding and promoting the instant messaging requirements of the financial services industry and to promote […]
(1) Short for Financial Information Exchange. (2) Short for Federal Internet Exchange.
Short for Free Lossless Audio Codec, a free codec developed by Xiph.org and used to compress audio files. FLAC is similar to MP3 except that it is lossless (the decoded audio is identical to what went into the encoder and is verified with a 16-bit CRC). None of FLAC��s encoding/decoding methods are covered by patents, […]