Nortel Passport 4400, Инструкция по использованию, Страница: 137 / 144

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Using Passport 4400 Install Tool Version 4.2
V.35
An electrical and mechanical standard for interconnecting high-speed (above
19.2 kb/s) data communications equipment used in both North America and
Europe.
virtual circuit
Provides the user with the equivalent of a physical connection to a destination
address using shared facilities. Virtual circuits can be permanent (PVC) or
switched (SVC). The virtual circuit is anchored in the processor cards
connected to the end user devices.
Voice Phone Directory Server
Refers to the server applications that resolve network addresses for a Passport
4400 which is sending out voice calls. This server can be the NAS on the same
or a different Passport 4400, or an RSA on a Passport 6400 which refers the
request to its Voice Networking Call Server (VNCS).
VoIP
Voice over Internet Protocol. An industry standard acronym for the software
protocols that allow voice and fax traffic to pass over the same virtual circuits
as the internet.
VoFR
Voice over Frame Relay. Software protocols that allow voice and fax traffic to
pass over Frame Relay circuits.
VPN
Virtual Private Network. A wide area communications network provided by a
common carrier that offers the appearance, functionality, and usefulness of a
dedicated private network, but actually it shares backbone trunks among all
customers as in a public network. It allows a private network to be configured
within a public network. Contrast with NSP.
WAN
Wide Area Network. A network used for data communications among widely
distributed geographic sites. Technologies used include leased lines,
connecting routers, multiplexers, packet switches, voice switches, and
products like Passport.