Comtech EF Data Vipersat CDM-570L, User Manual

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E-6
Vipersat CDD-564L User’s Guide
N
NAT N etwork A ddress T ranslation - An Internet standard that enables a local-area
network (LAN) to use one set of IP addresses for internal (private) traffic and a
second set of addresses for external (public) traffic.
NOC
N etwork O peration C enter (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
O ut d oor U nit – 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
O pen S hortest P ath F irst - A common routing algorithm.
P
PLDM
P ath L oss D ata M ulticast message is sent every sixty seconds and
contains information on messages received or lost.
POP3
P ost O ffice P rotocol 3 - A protocol for exchanging e-mail messages between
host computers. See also SMTP.
PMUX
P ort Mu ltiple x ing - Each port of the SDMS is individually configured from the
NMS port (hub) to port (remote) multiplexing.
PSTN P ublic S witched T elephone N etwork - Refers to the international telephone
system based on copper wires carrying analog voice data.
Q
QPSK Q uaternary P hase S hift K eying – A modulation technique in which the carrier
is phase s/- 90 or +/-180 degrees. See also BPSK