N
NAT Network Address Translation - An Internet standard that enables a
NOC Network Operation Center (NOC) has access to any earth station installed using the VIPERSAT Network Control System (VNCS). An NOC can remotely inter- rogate, control, and log network activities.
O
ODU Outdoor Unit – In a VSAT system the RF components (transceiver) are usually installed outdoors on the antenna structure itself and are thus referred to as an ODU.
OSPF Open Shortest Path First - A common routing algorithm.
P
PLDM Path Loss Data Multicast message is sent every sixty seconds and contains information on messages received or lost.
POP3 Post Office Protocol 3 - A protocol for exchanging
PMUX Port Multiplexing - Each port of the SDMS is individually configured from the NMS port (hub) to port (remote) multiplexing.
PSTN Public Switched Telephone Network - Refers to the international telephone system based on copper wires carrying analog voice data.
Q
QPSK Quaternary Phase Shift Keying – A modulation technique in which the carrier is phase shifted +/- 90 or
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