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Network Video Server User’s Guide
75
K. Glossary of Terms
ActiveX – A control (or set of rules) used by a browser. ActiveX controls are often downloaded and
installed automatically as required.
ARP – Address Resolution Protocol. A method for finding a host's Ethernet address from its
Internet address. The sender broadcasts an ARP packet containing the Internet address of another
host and waits for it (or some other host) to send back its Ethernet address. Each host maintains a
cache of address translations to reduce delay and loading. ARP allows the Internet address to be
independent of the Ethernet address but it only works if all hosts support it. The ARP command can
be used to set the IP – addresses for your product.
CGI – A standard for running external programs from a World-Wide Web HTTP server. CGI
specifies how to pass arguments to the executing program as part of the HTTP request. It also
defines a set of environment variables. Commonly, the program will generate some HTML which
will be passed back to the browser but it can also request URL redirection. A set of rules (or a
program) that allows a Web Server to communications with other programs.
DSL –Digital Subscriber Loop, A family of digital telecommunications protocols designed to allow
high speed data communication over the existing copper telephone lines between end-users and
telephone companies.
DHCP - A protocol that provides a means to dynamically allocate IP addresses to computers on a
local area network. The system administrator assigns a range of IP addresses to DHCP and each
client computer on the LAN has its TCP/IP software configured to request an IP address from the
DHCP server. The request and grant process uses a lease concept with a controllable time period.
Ethernet – A widely used networking standard.
Firewall –A virtual barrier between a LAN (Local Area Network) and other networks, e.g. the
Internet.
Frame Grabber Card – Plug-in hardware for “grabbing” images.