Weak current College】 【VOD common terms explained.

<br> Cable TV network <br> A complete cable TV network contains three parts: a front-end device + wired network + terminal equipment. <br> Front-end devices <br> Generally refers to produce and send a signal to the .CATV equipment: such as adjacent channel modem, video player (DVD, LD, etc.), video server, Distributor, etc. <br> Cable TV network <br> Refers to the transmission and distribution of physical media, the signal of a .fibre optic, coaxial cable, amplifier, branching / Distributor, etc. <br> Terminal equipment <br> The client receives and play TV signal devices such as televisions, set-top box, etc. <br> VOD host <br> Is .the storage, management, VOD programming device playback. The present from the video server, video player, on-demand signal switch, adjacent channel modulators, and other devices. VOD host usually placed in the room, and the other cable TV front-end .device combination. <br> VOD terminals <br> Generally referred to as VOD set-top box (STB). <br> VOD set-top box (STB): <br> And the TV are connected is responsible for handling tasks. .VOD According to the installation location in the upper set-top boxes (on TV), built in set-top boxes (installed on the TV set), rear-mounted set-top box (on the TV set behind). According to the .received signal is divided into ordinary STB (analog TV) and digital STB (digital TV signal). By uplink signals transmission paths into one-way STB (downlink signal is not in the same cable, the following lines to the CATV, uplink phone line .). Two-way-STB (downlink signal in the same root coaxial (RF) cable transmission) <br> One-way <br> Means the downlink signal (VOD VOD video and control signals) and uplink signal (STB uploaded to VOD .host control signal) is not in the same cable. General downlink signal coaxial cable. Uplink signal cable and telephone lines. <br> Bi-directional <br> Means the downlink signal (VOD video and control signals) and uplink signal (STB uplink .control signals) are in the same cable. Generally in CATV coaxial transmission. In the cable TV network, bidirectional transmission, require bidirectional transformation:, amplifier, branching, distributor for bidirectional type. Heavy workload. (Since branching, Splitter huge). Bi .-directional extension Wei VOD technology does not need to replace branch Distributor, just replace the bi-directional amplifiers. (Few in number, usually 500-user 1-2). <br> Upper set-top box <br> Looks like small .VCD box, can be placed on or near the TV. Responsible for transmitting signals VOD. Back panel with RF, AV port, power line, telephone outlet (one-way-, bi-directional-no) etc. A dedicated remote control. .The advantage is strong applicability, easy installation. The disadvantage is that the price is high, the line: the more vulnerable to malfunction, the operation is a little annoying. Generally used for family and other private places. <br> Built-in set .-top box <br> As a business card-size device module circuit board. Installation of the TV set. TV model is not limited to (but CPU is built into the STB, required under the TV model special customization). You can use .the original TV remote control. Built-in two-way STB box TV-out connector unchanged. One-way-built-in behind the STB TV, also need to increase a telephone interface. Built-in STB advantage is easy to use, .low price, high reliability, not external damage. Disadvantage: requires modification of the TV. Built-in STB is particularly suitable for hotels and public places VOD. VOD system extension for Viagra mainstream product is bi-directional built-in STB. <br .> Library volume <br> General to the video server's hard disk capacity as standard. To G-unit. 80G hard drive, to a VCD movie (about 0.6-1.2G) can save 80. DVD movies (2.5-4G) can save .20-30. MPEG4 (1.0-1.6G) can save 50. <br> Concurrent VOD <br> Means more Terminal at the same time or not at the same time this movie on demand, each terminal is from beginning to end to watch .the movie in full. <br> VOD channels: <br> Means at the same time, which can be used as Terminal on-demand cable TV channels. <br> VOD Channel <br> Specialized play webcasts of television channels. For on .-demand plays the movie from beginning to end users. <br> Carousel channel <br> Specialized broadcast carousel programs of television channels. The channel 24 hours non-stop take turns playing several specific movie, user points into the channel, the only way .to watch. <br> Welcome to channel <br> Turn on the TV, the first of the particular TV channel, play certain hotel welcomes you and various menus for guests for VOD. <br> VOD channels (channel number) <br> .Generally known as VOD system has several road, meaning the whole VOD system has several wire video. Current common 8-channel, 12-channel, 16-ch, 20-channel, 24 channels, etc. <br> Road / guest ratio < .br> VOD channels and the number of rooms. According to China, 3-4 star hotel, passengers and ratio of 1: 6 ~ 1: 12. Depending on the occupancy rate and on-demand rate decision. <br> 800M cable TV .network <br> Means to reach the national standard of CATV bandwidth 800M cable TV network. You can transfer most high frequency point to UHF44 frequency TV. Bi-directional VOD systems generally require 800M network. <br> 500M cable TV network <br> .Means the bandwidth up to 550M cable TV network. Because with narrow, VOD system frequency may be crowded into. Common in old hotel. <br> Mpeg1/Mpeg2/Mpeg4/movie <br> Mpeg1: VCD movie compression format. Computer files to .*. dat, *. MPG (uppercase). A film about 0.6-1G. The display resolution to 280 lines. <br> Mpeg2: DVD movie compression format, is a computer file with the extension *. mpg. vob, * ( .lowercase). Film is approximately 2-4G. Display resolution720 lines. <br> Mpeg4: movie compression ratio than VCD, DVD. Computer files to *. avi. A movie is approximately 0.8-1.4G. Display resolution of 480 lines. Image .quality is much better than VCD. <br> Wire video spots <br> Generally refers to analog cable TV center frequency modulated signal. If the channel number for CH40 frequency is 727.25MHZ. <br> Press speed <br> Refers to the press ., TV conversion speed VOD menus. Good VOD system should be less than 0.5 seconds. Feel no dull. <br> VOD speed <br> Refer to press ENTER to start the movie. General VCD movie should be less than 1.5 seconds. DVD movie .less than 5 seconds. <br> Channel <br> Especially the first few road VOD equipment and software. If you have a 16-way of VOD system, said 12-channel trouble refers to the 12 VOD frequency device or software problem. < .br> VOD programs <br> Generally refers to VOD system host used programs including broadcast programs (responsible for on-demand control), VOD management program (movie and host management), billing, and statistics program, etc. <br> Hotel management .system (hotel computer integrated management system) <br> Hotel internal use, client management, billing management, employee management, financial management, restaurant management, and other functions. VOD's billing and the management can also be used as a room child module hang hotel .management system. <br> On-demand rate <br> VOD / rooms / day per hundred. <br> Press day fees <br> To the evening 0 points for that day when unlimited 24. Only charges a fee. <br> .24 hour <br> From the time of the 1st on-demand as the start time, 24 hours unlimited. Receive a fee. <br> By the time the fees <br> On-demand. Receive a fee. <br> Test .piece <br> Maintenance personnel in the computer, enter the password, you can specify the Terminal (TV) for a test. <br> Edit management computer <br> For VOD movie editing, program management, and various parameters for VOD host. .<br> VOD video server <br> Three major functions: movie library and management; system management and billing; sometimes as welcome screen feature and and hotel management system networking features. <br> Bi-directional VOD signal switch (CMTS) <br .> The collection, Exchange and distribution Terminal VOD control signal. <br> O-tone (cable TV signals in adjacent channel modulator) <br> The video source output AV signal modulation for a specific frequency RF TV signal (RF signal). < .br> Video player <br> From native or server library to the movie file into AV signal (or digital video signal). <br> On-demand number with Rob <br> Refers to the server at the same time be able to respond .to the number of maximum Terminal. Bidirectional type systems of up to 100. One-way-depending on the receiving server calling card number of telephone lines, generally 2-6. On-demand along with Rob number is too high and no significance. .Because VOD channels limited. <br> <br> <br> <br> <br>.