User guide

E-6 Vipersat CDD-56X Series User Guide

NAT Network Address Translation – 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 Network Operation Center – Has access to any earth station installed using the

VIPERSAT Network Control System (VNCS). An NOC can remotely interro-

gate, control, and log network activities.

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.

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 e-mail messages between

host computers. See also SMTP.

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 world’s public circuit-

switched telephone network governed by technical standards created by the

ITU-T, using telephone numbers for addressing. A mixture of digital and analog

telephone systems, the network includes mobile as well as fixed (land-line) tele-

phones.