D-Link Systems, Inc.
Glossary
6
DVC-000 User’s Manual
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
(kbps).
CIF (Common Intermediate Format):
An intermediate video format. When
DVC-2000 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 DVC-2000 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.
