User`s guide

Glossary
G-2 MS-4900, Rev. A
downlink
Information transmitted to an earth station from a satellite.
download
Control information transmitted from a network control center to a receiver
EEPROM
Electronic Eraseable Programmable Read-Only Memory.
Ethernet
A popular local area network (LAN) implementation.
FEC
Forward Error Correction.
head-end
The network control center, or the location that assembled and transmitted
the received data stream
HDLC
High-Level Data Link Control. A version of synchronous protocol.
IDR
Intelligent Data Receiver. A WavePhore product trademark.
L-band
Used to denote LNB output and IDR V1000 input frequency range, which is
between 950 mHz and 1,525 mHz.
LCD
Liquid Crystal Display. Used as the mechanism displaying the front panel
screens.
LNB
Low Noise Block Converter. The device attached to the satellite dish that
extracts a set of satellite carriers, lowers their frequency to the L-Band range,
and amplifies the signal to an appropriate input level for the tuner.
link blocks
Associated with stat mux data, the partition of the aggregate data stream that
contains packets. The link blocks are extracted by the time-division
demultiplexer and sent to the processor for “de-packetizing.”
lock
proper carrier is located and is being received and demodulated.
logical receivers
separate entities defined by software that function as distinct destinations for
incoming data. The IDR V1000 with a 4-port daughtercard can have four
logical receivers operating simultaneously within a single physical unit.
NMS
Network Management Services. A means of controlling and monitoring
operations at the network control center.
network control
center
NCC. The “head-end” or hub where data feeding in from multiple origination
points is assembled, statistically-multiplexed, time-division multiplexed,
modulated, and prepared for uplinking to a satellite. The NCC would
typically notify receiver sites of network changes required at their site and
then download those changes.