Glossary
HE4000 Encoding System
E
E
b
/N
0
E
b
= Energy per information bit; N
o
= Noise energy per Hertz. Signal energy
with respect to noise, expressed in energy per bit/noise in 1 Hz bandwidth.
EEPROM
Electrically Erasable Programmable Read Only Memory
EIA
Electronic Industries Association
EMI
Electromagnetic Interference
ESC
Engineering Service Circuits
ES-ES
Earth Station to Earth Station Communication
ET
Earth Terminal
E-3
European standard 34.368 Mbps digital interface.
F
F
Fahrenheit
FAS
Frame Acquisition Sync. A repeating series bits, which allow acquisition of a
frame.
Fault
A disturbance that impairs or disrupts normal operations.
FCC
Federal Communications Commission
FEC
Forward Error Correction
FIFO
First In, First Out. A type of data buffer.
FPGA
Field Programmable Gate Array. A chip that can be reprogrammed for various
uses.
FW
Firmware
G
g
Force of Gravity
GHz
Gigahertz
GND
Ground
G.703
ITU-T Recommendation G.703, “Physical/Electrical Characteristics of
Hierarchical Digital Interfaces.” An interface protocol used for terrestrial
transmissions that operates at multiples of 64 Kbps PCM.
H
HPA
High power amplifier. A device which provides the high power necessary to
transmit radio signals from an earth terminal to a satellite.
HSSI
High Speed Serial Interface
HW
Hardware
Hz
Hertz (Unit of Frequency)
GL-4
01-0951-404 Rev B
