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AP-VP500 Video Phone Installation & Operation Guide, Release 1.00
PBX
PING
Point to Point Connection
Pont to Multipoint
Connection
POTS
PPP
Protocol Stack
PSTN
PVC
Q.931 Signaling
QoS
RAM
data is contained. A packet mainly refers to the unit of network layer data.
Stands for Private Branch eXchange. PBX, which is located in a subscriber building, is a
digital or analog phone switchboard used to connect private networks to public phone
networks.
Stands for Packet INternet Groper. ICMP echo-processes a response between messages.
PING is used for an IP network to test the accessibility of network devices.
One of the two basic connection types. In ATM, the point to point connection may be
either a one-way connection or a two-way connection between two ATM end systems.
One of the two basic connection types. In ATM, the point to multipoint connection is a
one-way connection method that enables a transmitting end-system (root node) to be
connected to multiple receiving end-systems (riff). Compare to: Point to Point
Connection
Stands for Plain Old Telephone Service. Reference: PSTN.
Stands for Point-to-Point Protocol. This protocol is the advanced version of SLIP that
enables a router-to-router connection or a host-to-network connection through
synchronous or asynchronous lines. SLIP is designed to be used on an IP, while PPP is
used along with network layer protocols such as IP, IPX, and ARA. PPP has a bulletin
board security mechanism such as CHAP and PAP. PPP has two sub-protocols, LCP and
NCP. Reference: CHAP, LCP, NCP, PAP, and SLIP
This is a collection of communication protocols that inter-work with one another and that
process communications in part or all of the seven layers of the OSI reference model. All
protocol stacks are not related to each layer of the OSI model, and one protocol of a
stack can process multiple layers at one time. TCP/IP is a typical protocol stack.
Stands for Public Switched Telephone Network. PSTN is a general term that refers to
various telephone networks and services used worldwide. PSTN is also called POTS.
Stands for either Permanent Virtual Circuit or Permanent Virtual Connection. PVC is a
virtual circuit installed permanently. PVC allows you to reduce a bandwidth for setting
up or releasing a circuit when a specific virtual circuit must always exist. As an ATM
term, PVC is called Permanent Virtual Connection.
This is an ITU standard that specifies ISDN signal processing methods. The H.225.0
standard uses a variation of Q.931 to set up or disconnect the session of H.323.
Stands for Quality of Service. QoS is the criterion of measuring the performance (e.g.
transmission quality and service availability) of a transmission system.
Stands for Random-Access Memory. RAM is a volatile memory that can be read or
written by a microprocessor.
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