AddPac VoiceFinder AP2120 Bedienungsanleitung PDF herunterladen (Seite 153)

2004 AddPac Solution Guide May 2004

AddPac Technology Proprietary & Documentation 157 - 153

while allowing all users to share a certain number of external phone

lines.

PING

Packet INternet Groper, a packet (small message) sent to test the

validity / availability of an IP address on a network

Point to Point Connection

Basic connection type. In ATM, point to point connection is half

duplex connection between two ATM end systems or full duplex

connection.

Pont to Multipoint

Connection

Basic connection type. In ATM, point to multipoint connection is half

duplex connection among one sending end system (root node) and

multiple receiving end system. Compare with: point-to-point

connection.

POTS

Plain Old Telephone Service. Compare with: PSTN.

PPP

The most popular method for transporting IP packets over a serial link

between the user and the ISP. Developed in 1994 by the IETF and

superseding the SLIP protocol, PPP establishes the session between the

user's computer and the ISP using its own Link Control Protocol (LCP).

PPP supports PAP, CHAP and other authentication protocols as well as

compression and encryption.

Protocol Stack

Any set of communication protocols, such as TCP/IP, that consists of

two or more layers of software and hardware. It's called a stack

because each layer builds on the functionality in the layer below

PSTN

Public Switched Telephone Network – term for the entire, world-wide

telephone network. Sometimes refers to as POTS.

PVC

Permanent Virtual Circuit or permanent virtual connection. A

continuously available communications path that connects two fixed

end points.

Q.931 Signaling

ITU-T specification for network layer of ISDN. Q.931 uses out-of-band

signaling on the D-channel to control calls.

QoS

This refers to the assumption that data transmission rates, error rates,

and other characteristics can be measured, improved, and to some

degree, guaranteed in advance. Basically, QoS describes a collective

measure of the level of service a provider delivers to its customers or

subscribers.

RAM

Random-Access Memory, a non-retentive memory, whose contents get

lost after a switch-off or reset. Application programs run in the random

access memory and data is stored and processed.

RAS

Registration Admission Status protocol. The communication protocol

used to convey registration, admission and status messages between

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