Comtech EF Data VIPERSAT File Streamer v1.2.x - Manual (Page 47)

Appendix A - Glossary A-3
E
E
b
/N
o
E
b
/N
o
is the ratio of E
b
(energy per bit) and N
o
(noise power density per Hz).
The bit error rate (BER) for digital data is a decreasing function of this ratio. E
b
is the energy of an information bit measured in Joules, or equivalently, in Watts
per Hertz.
F
FAST Code Fully Accessible System Topology Code – Designation for feature code used
by Comtech EF Data for their satellite modems. The FAST method makes it
easy to quickly upgrade the feature options of a modem while it is running live
in the network, either on site or remotely.
FDMA Frequency Division Multiple Access – A technique where multiple users can
access a common resource (e.g. satellite) by each being allocated a distinct
frequency for operation. See also TDMA.
FEC Forward Error Correction – A process whereby data being transmitted over a
communications link can have error correction bits added which may be used at
the receiving end to determine/correct any transmission errors which may occur.
FIFO First In First Out – A simple buffer or queue technique whereby data queued
the longest is transmitted first.
FTP File Transfer Protocol – An application for transferring computer files over the
Internet. See also TFTP.
G
G.729 ITU standard for LD-CELP (Low Delay – Code Excited Linear Prediction)
voice encoding at 8 kb/s.
GIR Guaranteed Information Rate
Group ID A number assigned to equipment which defines it as a member of a group when
addressed by the VMS burst controller.
GUI Graphical User Interface – A form of graphical shell or user interface to a
computer operating system.