Wavecom W-Sat-email-Decoder V2.3.1 - Manual (Page 29)

WAVECOM Sat email Decoder W-Sat-email-Decoder V2.3.1 Glossary of Terms  25
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DIS
The DIS input (Discriminator) has a range of 0 – 20 kHz. This input is supported by a few VHF-UHF re-
ceivers and facilitates the reception of ”Direct FSK” signals like POCSAG or PACKET-9600. The advantage
of this input is the easy handling. Only the gain has to be adjusted. There is no need for an adjustment of
the center or the translation frequency. DIS is only released for ”Direct FSK” modes.
Disable
To make an item unavailable for use. Disabled items reflect the WINDOWS color settings for disabled
commands, and generally appear dimmed and cannot be chosen.
EOD
End-Of-Data.
Error message
A message displayed to tell the user about an error or problem in the execution of a program or in the us-
er's communication with the system. An error message is often accompanied by a beep.
EXT-DEM-IN
The EXT-DEM-IN input must be used if an external demodulator is to be connected. The minimum input
level is TTL level (LO = 0 V, HI = +5 V) and the maximum is RS-232C level (LO = -12 V, HI = +12 V).
Note that utilizing this facility will disable certain W51PC functions. Thus this input should be employed for
special purposes only.
FDX
Full duplex.
FEC
Forward error correction (FEC) is error control methode for data transmission, whereby the sender adds
redundant data to its messages, also known as an error-correction code. This allows the receiver to detect
and correct errors (within some bound) without the need to ask the sender for additional data. The ad-
vantages of forward error correction are that a back-channel is not required and retransmission of data
can often be avoided (at the cost of higher bandwidth requirements, on average). FEC is therefore applied
in situations where retransmissions are impossible (traffic lists, broadcasts).
FFSK
Fast Frequency Shift Keying.
FFT
Fast Fourier Transform.
File type
The categories of files specified by file extensions: APP, DBF, PRG, CDX, FRX, and so on.