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List of terms 413
IP addresses to unique IP addresses before sending out packets. NAT is
practical when only a few users in a domain need to communicate outside
of the domain at the same time.
NCS
Short for Network Connection Server. It provides a TPS interface to the
NRS, allowing the TPS to query the NRS using the UNIStim protocol. It is a
remote system node IP based on BUID (Branch Office), virtual office user
(network wide virtual office login), and NUID (Geographic Redundancy). It
also checks remote system status and provides it to the TPS for further
analysis. The NCS is required only for set redirection, while the rest of the
NRS requires for calls. It is part of NRS H.323 Gatekeeper and is not part of
NRS SIP proxy. It is required to support the MG 1000B, Virtual Office, and
Geographic Redundancy features.
NRS
Short for Network Routing Service, which refers to the software application
where all systems in the network are registered. The NRS consists of the
Session Initiation Protocol (SIP) Redirect Server and the H.323 Gatekeeper,
which includes the Network Connection Service (NCS).
PSTN
Short for Public Switched Telephone Network, which refers to the
international telephone system based on copper wires carrying analog
voice data. This is in contrast to newer telephone networks based on digital
technologies, such as ISDN and FDDI.
Telephone service carried by the PSTN is often called plain old telephone
service (POTS).
QoS
Short for Quality of Service, a networking ter m that specifies a guaranteed
throughput level. One of the biggest advantages of ATM over competing
technologies, such as Frame Relay and Fast Ethernet, is that it supports
QoS levels. This enables ATM providers to guarantee to their customers
that end-to-end latency does not exceed a specified level.
There are several methods to provide QoS, as follows:
•
high bandwidth
•
packet classification
• DiffServ
•
IP fragmentation
•
traffic shaping
•
use of the platform’s queuing mechanisms
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.