AP-VP150 Video Phone Installation and Operation Manual, Edition 1.00
AddPac Technology Proprietary & Documentation
205 - 198
individuals or enterprises. ISP has devices and communication lines required for
Internet access, and large ISPs have their own high-speed dedicated lines in order to
provide services that have better quality and are less dependent on telephone
network service providers to their customers. The large nationwide ISPs of the U.S.
are AT&T WorldNet, IBM Global Network, MCI, Netcom, UUNet, and PSINet. Those
of Korea are INet, Channeli, Netsgo, and Netian. The users access the Internet
through online service providers. The main online service providers of the U.S. are
America Online and Compuserve, and those of Korea are Chollian, Unitel, and Hitel.
ITU-T
Stands for International Telecommunication Union Telecommunication
Standardization Sector. This is an international organization that develops global
standards on communication technologies. ITU-T performs the previous tasks of
CCITT.
IVR
Stands for Interactive Voice Response. IVR refers to a system that provides data in
the form of recorded messages through phone lines as a response to user input in
the form of human voice or mainly DTMF signal processing. Examples are banks that
allow you to check balance by using a phone or automated stock quotations system.
LAN
Stands for Local Area Network. This is a low-error, high-speed data network that
covers relatively small geographical areas of up to several thousand meters. LAN
inter-connects workstations, peripherals, terminals, and other devices in a building or
a geographically limited area. The LAN standard specifies a cable connection and
signal processing method in the physical layer and data link layer of the OSI model.
Reference: MAN, WAN.
Link
This is a network communication channel configured with lines or a transmission path
between the transmitter and receiver and related devices. A link mainly refers to WAN
connections, and is sometimes called a line or a transmission link.
Loopback Test
This test is performed as follows: Transmit a signal or return it to the transmitter at a
location on the communication path. This loopback test is usually performed to test
the availability of network interfaces.
MAC Address
Stands for Media Access Control Address. This is a standard data link layer address
required for any and all ports and devices connected to LAN. Other devices on a
network use this address to locate a specific port within the network and to create or
update a routing table and data structure. A MAC address is 6 bytes long, and is
managed by IEEE. A MAC address is called as a hardware address, a MAC-layer
address, or a physical address. Compare to: Network Address
