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174 Glossary

Enterprise Edge Networking Operations Guide P0910464 Issue 01

protocol A protocol is a formal set of communication rules developed by

international standards bodies, LAN equipment vendors, or groups

governing the format, control, and timing of network

communications.

PVC The permanent virtual circuit (PVC) is an end-to-end virtual

connection in frame relay networks.

relaying Relaying is the process of moving data along a path determined by a

routing process. The data is relayed between a source and a

destination.

remote (device) A remote device is any network device that is accessible only by

means of communication over a digital or analog (dial-up) network.

proxy A proxy is a server that acts on behalf of another.

QoS On the Internet and in other networks, Quality of Service (QoS) is the

idea that transmission rates, error rates, and other characteristics can

be measured, improved, and, to some extent, guaranteed in advance.

QoS is of particular concern for the continuous transmission of high-

bandwidth video and multimedia information.

Using the Internet's Resource Reservation Protocol (RSVP), packets

passing through a gateway host can be expedited based on policy and

reservation criteria arranged in advance. Using ATM, which also lets

a company or user preselect a level of quality in terms of service, QoS

can be measured and guaranteed in terms of the average delay at a

gateway, the variation in delay in a group of cells (cells are 53-byte

transmission units), cell losses, and the transmission error rate.

In Enterprise Edge, QoS is provided over IP. QoS is guaranteed for

outgoing traffic until it reaches the next hop.

RAS The remote access service (RAS) is the ability to get access to a

computer or a network from a remote distance. In corporations,

people at branch offices, telecommuters, and people who are

travelling may need access to the corporation's network. Home users

get access to the Internet through remote access to an Internet service

provider (ISP).

A remote access server is the computer and associated software that is

set up to handle users seeking access to network remotely. Sometimes

called a communication server, a remote access server usually

includes or is associated with a firewall server to ensure security and a

router that can forward the remote access request to another part of

the corporate network.

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Avaya EE Networking Betriebsanweisung Seite 174