Zoom ratio adjustments can be performed using the Easy Zoom button built in our cameras for easy installation. These adjustments can also be made from a PC.
Edge Storage (on-board recording with memory cards)
The Edge Storage function records video and audio data with memory cards (such as SD and micro SD cards) attached to the camera. It can be used for fail-over data backup if the network is disconnected due to unstable network conditions or other difficulties. It can also be used for event recording when the recording is started by an alarm signal triggered by the cameras video analytics functions (such as Intelligent Motion Detection and Tamper Alarm), as well as by user-defined rules of DEPA and DEPA Advanced technologies. This function also enables scheduled recording, for convenient local storage. The recorded data can be transmitted to network video recorders (NVR)/video management software (VMS) and merged with data saved on the NVR/VMS storage. SD cards capable of an Edge Storage Maintenance Notification function* are recommended for these applications. * Memory cards have a finite lifespan that is reduced over time by recording. With the Edge Storage Maintenance Notification function, users can obtain remotely the lifespan information of cards attached to the camera.
Electronic D/N is a technology to make the image more visible in low-light conditions by removing the chroma or colour signal to produce a B/W image.
Electronic Image Stabilizer
Electronic Image Stabilizer electronically compensates for movement in captured images using image processing. Two images captured back and forth by the camera are recorded to its buffer memory, in which the cameras image processor calculates their distance and compensates for movement. This helps to minimize the effect of camera shake or vibration and achieve less blurry images.
Ethernet is the most common set of rules controlling network communications for local area networks. It is a set of standards that define rules such as frame format as well as how computers communicate with each other over a single wired shared by all devices on the network. These rules give any new device attached to the wire the ability to communicate with any other attached device. Ethernet can also be used as a wide area network (WAN) technology. In this application, it is often referred to as carrier Ethernet. Organizations such as the Metro Ethernet Forum are helping to accelerate adoption of carrier Ethernet networks and services.
Ethernet cabling is twisted-pair cabling that meets standards for use on an Ethernet-based network. Category 5 (Cat 5) and Category 5e (Cat 5e) cabling are commonly in use today. Straight through Ethernet cables can be used to connect an end-user device to a networking device such as a switch. Crossover Ethernet cables can be used to connect one end-user device directly to another.
The e-Varifocal feature allows the installer to adjust the fixed-lens cameras field of view in a similar way to adjusting the field of view on a varifocal lens camera at installation. The fixed-lens camera maintains the selected resolution, while also allowing digital zoom, pan and tilt operation to fine tune the angle of view. After installation, precise adjustments can be made to the fixed-lens cameras field of view. This can be done on a remote basis, reducing the cost of maintenance.
Evidence Shot records high-quality JPEG images with the cameras maximum resolution at a low frame rate, simultaneously providing an overview video stream with smaller size images in H.264. This function is useful for applications where forensic analysis is required to identify faces and car license plates in city streets and car parks. The high resolution (20 megapixels with the SNC-VM772R) allows for enlargement of specific areas of interest in the scene to examine details more precisely.
In IPv6, extension headers are used to extend the functionality of the IPv6 header. IPv6 has a fixed length header. Optional extension headers are then used to extend functionality when needed. The IPv6 header and each extension header contain a Next Header field, which specifies the type of the next header that follows. This allows a variable number of extension headers to be added.
Fiber Distributed Data Interface (FDDI)
Fiber Distributed Data Interface (FDDI) is a standard for data transmission on fiber optic lines that can extend in range up to 200 km (124 miles).
Fiber Optic Lines
Fiber optic lines are glass or plastic threads or fibers used to transmit data. Fiber optic lines operate at Layer 1 or the Physical Layer. SONET/SDH connections use fiber optic lines.
See Forensic Mark
Federal Information Processing Standards. All DCI compliant projection systems must be inside cases complying to the FIPS-140 standard. This prevents physical access to the movie by unauthorised personnel
Five-Layer Reference Model
The Five-Layer Reference Model is a commonly used combination of the OSI Reference Model and the TCP/IP Reference Model. The five layers defined in this model are as follows: Application Layer,Transport Layer/Layer 4, Network Layer/Layer 3, Data Link Layer/Layer 2, Physical Layer/Layer 1
Cinema language for 1.85:1 picture aspect ratio. Close to 16:9 format
Flicker Reduction minimizes flicker phenomena that are seen as blinks or horizontal stripes caused by differences in brightness on the monitor when shooting video under fluorescent, sodium, or mercury lamps. This function analyses brightness of the captured images and compensates for differences in brightness with image processing to maintain picture quality with fewer flickers.
For a switch or bridge, flooding means forwarding data on of all ports except the port on which data was received. When one of these network devices receives data destined for an unknown address, data destined for the broadcast address, or data destined for a multicast address, it will flood the data on all of its ports except for the port on which the data was received.
A signal which is encoded within the picture/audio that is invisible to the human eye/ear. If the movie is copied with a camcorder/stills camera (audio recorder), the pirate copy/still picture/audio can be analysed to extract the forensic mark which will tell which cinema the movie was copied in
Forward Explicit Congestion Notification (FECN)
Forward Explicit Congestion Notification (FECN) bits are bits in the Frame Relay header used to notify an end station, such as a router, of network congestion. When congestion occurs, Frame Relay switches set the FECN bit to a 1 in frames going toward the destination location or going downstream. In this way, all downstream devices learn about congestion.
Forwarding Equivalency Class (FEC)
A Forwarding Equivalency Class (FEC) is a group of packets that the provider's MPLS domain forwards and treats the same.
A forwarding storm is network congestion caused by a looped network. When a bridge or switch receives a frame for which it doesn't have the destination MAC address in its table, or when it receives broadcast or multicast traffic, it floods the frame out every other port. In a looped network, this can result in the same data being received on multiple ports and being forwarded again and again. A forwarding storm can block all other network traffic and bring a network to a complete stand still. To prevent loops, bridges and switches can use the Spanning Tree Protocol, or STP.
Forwarding Table/MAC Address Table
A forwarding table or MAC address table is where a switch stores address and location information for all devices connected directly to its ports.
Fragmentation is the process of breaking an IP packet into smaller chunks or fragments when transmitted over data link technology with a smaller MTU.
A frame is one unit of data encapsulated at Layer 2, or the Data Link Layer. Each frame is divided into three parts: the header, the data, and the trailer. The frame header contains the data's destination and source Layer 2 addresses. It also indicates which Layer 3 protocol should be used to process the data on the receiving computer. (In the examples in this course, the IP protocol is used.) The frame trailer is a checksum, which is used to verify data integrity.
Frame Check Sequence (FCS)
Frame Check Sequence (FCS) is a 2-byte or 4-byte checksum computed over the frame to provide basic protection against errors in transmission.
The number of frames of a moving image that can be transmitted per a second.
Frame Relay is a Layer 2 WAN protocol used to interconnect multiple locations or LANs over a single communications line-such as a T1/T3 or E1/E3 line. With this single line, customers can communicate with multiple sites using virtual circuits. Frame Relay is a cost-effective alternative to dedicated point-to-point connections and can be used to build a Layer 2 Virtual Private Network.
File Transfer Protocol (FTP) is a network protocol used to transfer data from one computer to another through a network, such as over the Internet.
Software to be used for accessing the FTP server.
A server to be used to transfer files via a network.
Full-duplex data transmission allows for communication in two directions at the same time. That is, a device can receive and transmit data simultaneously. This functionality is similar to using a telephone where you can talk and listen at the same time.