ND SatCom SKYWAN IDU 7000 Manual page 149

Term
Port
Propagation Delay
Processing Delay
Quadrature Phase Key
Shifting (QPSK)
Quality of Service (QoS)
Rain Fade
Reference Burst
Request Burst
Satellite
Satellite news gathering
(SNG)
Single Channel Per Carrier
(SCPC)
Signal to Noise Ratio (S/N)
Single hop
Slave
SkyNMS
2010-10-26
Definition
1. is normally used for the physical aspect of the systems
boundary or 2. is defined as (logical application) port : i.e. port
21 for FTP. See also Interface.
The time it takes for a signal to go from the sending station
through the satellite to the receiving station. This propagation
delay for a single hop satellite connection is very close to 240
ms. See also Processing Delay and Latency.
The cumulative delay in a packet-switched satellite network
caused by hardware and software. See also Propagation De-
lay and Latency.
QPSK phase shift modulation involves four levels of phase
shift and encodes two bits per symbol. See also 8-PSK and
Symbol Rate.
Provides priority and guarantees a certain level of network re-
sponse time and other performance factors for each applica-
tion and user.
Decrease of satellite signal strength due to rainfall.
Burst sent from the SkyWAN
network management information like the frame plan.
Burst sent from the SkyWAN
request network resources.
Communications satellites orbit the earth in geostationary orbit
and transmit and receive radio frequency signals from VSAT
earth stations.
Is typically done from a transportable unit (truck or mobile en-
tity) to transmit video and voice feeds to the studios.
A satellite access method that dedicates one channel to each
remote site, sometime used for very high capacity links. See
also TDMA.
The ratio of the signal power and noise power. The higher the
number the better the quality.
Transmission of information from one remote site to another
antenna. Typically it describes the path between two remote
stations in a mesh network without having to go via a hub (dou-
ble hop).
®
Any SkyWAN IDU which is not assigned the active master
role.
ND SatCom's Network Management System for central config-
uration, operation and monitoring of SkyWAN
Network Design and Engineering Guide
Appendix C - Glossary
®
master IDU containing TDMA
®
slave stations to the master to
®
networks.
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