AP-VP150 Video Phone Installation and Operation Manual, Edition 1.00
AddPac Technology Proprietary & Documentation
205 - 199
MAN
Stands for Metropolitan-Area Network. This network covers the entire area of a large
city. The operation area of MAN is geographically larger than that of LAN; however, is
smaller than that of WAN. Compare to: LAN, WAN.
MGCP
MGCP, which is also known as H.248 or Megaco, is a standard protocol required to
operate signals required during a multimedia conference or to manage sessions. This
protocol defines a method of communications between the media gateway that
converts the data format required for a circuit switching network to the one required
for a packet switching network and the media gateway control device. MGCP may be
used to set up, manage, and complete calls among multiple endpoints. Megaco and
H.248 are the improved version of MGCP.
NAT
Stands for Network Address Translation. NAT is a mechanism for reducing the need
for globally unique IP addresses. NAT allows you to access the Internet as an
organization whose address is not globally unique converts the address to an
address space where the address can be globally routed. NAT is also called Network
Address Translator.
NTP
Stands for Network Time Protocol. NTP, which is built based on TCP, sets a local time
accurately based on a wireless clock and an atomic clock on the Internet. NTP can
synchronize a distributed clock in the unit of milliseconds for a long time.
PABX
Stands for Private Automatic Branch eXchange. PABX is a switch for phones used at
enterprises. PABX is used in Europe, while PBX is used in the U.S.
Packet
A packet is a group of logical data that contains user data and a header where control
data is contained. A packet mainly refers to the unit of network layer data.
PBX
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.
PING
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.
Point to Point Connection
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.
Pont to Multipoint
Connection
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