Glossary - D-Link DPH-300 User Manual

DPH-300 User's Manual

Glossary

Glossary
Bandwidth: A measure of the rate at which data can be sent and received through a
network. This value is usually given in bits per second (bps) or mega bits per second
(Mbps).
CIF (Common Intermediate Format): An inter mediate video for mat.
When DPH-300 video is transmitted over a network, the sizes will be CIF, QCIF, or
SQCIF. The VideoPhone will default to CIF. CIF resolution is 352 x 288.
DHCP (Dynamic Host Configuration Protocol): A protocol that network devices use
to obtain an IP address, subnet mask, gateway and DNS addresses automatically. A
DHCP server can be a router, ISP server, or PC running Internet connection sharing.
See Static IP address.
Directory Service: A service that allows users to make videoconferencing calls with
telephone numbers. It does this by correlating telephone numbers to actual public IP
addresses.
DMZ (Demilitarized Zone): Devices set up to be in the router's DMZ will see all network
traffic.
DNS (Domain Name System): A system used to translate computer names into IP
addresses. For example, a DNS server would translate www.dlink.com into 64.7.210.132.
DSL (Digital Subscribers Line): A technology that delivers digital information at a
high speed through a user's telephone line. The most common DSL is ADSL
(Asymmetrical Digital Subscribers Line) where the download speed is usually much
higher than the upload speed.
Dynamic IP address: An IP address for a particular network device (PC, VideoPhone,
router) that is dynamically assigned by a router or ISP and will not remain the same
from session to session. See DHCP.
Ethernet: The port on the back of the DPH-300 VideoPhone that is used to send and
receive data over a network.
Far side: The remote connection of the videoconference. Your connection is the Local
Connection.
Firewall: A security mechanism placed between networks, which restricts certain types
of data to devices behind the firewall.
H.323: Standard defining videoconferencing over the Internet.
Home Gateway: A term commonly interchanged with router. Also called a residential
gateway.
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