ND SatCom SKYWAN IDU 7000 Manual page 148

Appendix C - Glossary
Term
Modem
Modulation
Multicast
Multicast Aggregate
Multicast Microflow
Multiplexing
Network Operations Cent-
er (NOC)
Network Management
System (NMS)
Node
Outbound
Outdoor Unit (ODU)
Packet
Polarization
144
Definition
A piece of network equipment containing a modulator and de-
modulator for receiving or transmitting satellite signals. See
®
SkyWAN IDU.
The encoding of a carrier wave by amplitude or frequency or
phase.
Multicast is a subset of broadcast whereby the signal can be
sent to many sites within a defined group, but not necessarily
to all sites in that group.
Group of multicast-microflows logically grouped together. It de-
scribes a certain multicast routing behavior. This multicast ag-
gregate abstraction depends on the current scope. If the scope
is the sat-access subnet a multicast aggregate is a group of
multicast microflows belonging to one MF-TDMA channel. See
also Multicast Microflow.
A microflow which is destined to one of the multicast IP ad-
dresses (224.0.1.0 to 239.255.255.255).
Sending multiple signals or streams of information on a carrier
simultaneously transmitting on a single signal.
Centralized location where control over operation of a network
is managed and monitored remotely.
Hardware and software used for monitoring and controlling a
satellite network. See also SKYNMS.
From a networking perspective a SkyWAN
work node. Hence, in the context of communication services
the term node for aSkyWAN
In a VSAT network it is typically referred to as the transmission
from the network hub to a remote station.
Equipment located outside of a building close to the satellite
dish or antenna. It typically includes a low noise block convert-
er (LNB) and a block up converter (BUC).
Basic unit of encapsulation which is passed across the inter-
face between the network layer and the data link layer. A pack-
et is usually mapped to a frame.
A technique used by satellite operators to reuse the satellite
transponder frequencies when transmitting these signals to
earth (linear or circular). To successfully receive and decode
these signals on earth, the antenna must be outfitted with a
properly polarized feedhorn to select the signals as desired.
Linear or Circular Polarization is used on satellite transpond-
ers.
Network Design and Engineering Guide
®
IDU acts as a net-
®
IDU is preferred.
2010-10-26