Instruction Manual
AirLivePOE200CAMv2User’sManual
109
Gain -
Gain is the amplification factor and the extent to which an analog amplifier boosts the strength of a signal.
Amplification factors are usually expressed in terms of power. Decibel (dB) is the most common way of
quantifying the gain of an amplifier.
Gateway -
A gateway is a point in a network that acts as an entry point to another network. In a corporate network
for example, a computer server acting as a gateway often also acts as a proxy server and a firewall
server. A gateway is often associated with both a router, which knows where to direct a given packet of
data that arrives at the gateway, and a switch, which furnishes the actual path in and out of the gateway
for a given packet.
GIF (Graphics Interchange Format) -
GIF is one of the most common file formats used for images in web pages. There are two versions of the
format, 87a and 89a. Version 89a supports animations, i.e. a short sequence of images within a single
GIF file. GIF89a can also be specified for interlaced presentation.
GOV (Group Of VOPs) -
A group of VOPs is the basic unit of an MPEG-4 video stream. The GOV contains different types and
numbers of VOPs (I-VOPs, P-VOPs, etc.) as determined by the GOV length and GOV structure. See
also VOP.
GOV length -
The GOV length determines the number of images (VOPs) in the GOV structure. See also GOV and
VOP.
GOV structure -
The GOV structure describes the composition of an MPEG-4 video stream, as regards the type of
images (I-VOPs or P-VOPs) included in the stream, and their internal order. See also GOV and VOP.
Half-duplex -
See Full-duplex.
HTML (Hypertext Markup Language) -
HTML is the set of "markup" symbols or codes inserted in a file intended for display in web browser. The
markup tells the browser how to display the page's words and images for the user.
HTTP (Hypertext Transfer Protocol) -
HTTP is the set of rules for exchanging files (text, graphic images, sound, video, and other multimedia
files) on the web. The HTTP protocol runs on top of the TCP/IP suite of protocols.
Hub -
A (network) hub is used to connect multiple devices to the network. The hub transmits all data to all
devices connected to it, whereas a switch will only transmit the data to the device it is specifically
intended for.