catv channels

can use more than four channels in the same coaxial cable branch distribution network. Each channel can provide users with 80 Mbps of shared bandwidth. With hinoc technology, the network structure of existing users can be easily changed, and multiple business applications, including high-speed Internet access, Hd/standard, broadcast, IPTV, VOD, and VoIP, can be carried. 5. technical features and application analysis (1) technical features, hinoc

[Abstract]: Modern communications to digital, broadband, intelligent, integrated development, the rapid development of digital technology has been CATV network, telephone network and data network closely linked to provide a variety of different types of information services, video on demand is one of them. This paper introduces the digital set-top box in VOD system, including the key technology, relevant standard and concrete realization method of STB

designed for the local area network, it is not used for the public operation Network construction, its network security loophole is many, the service operation Management realizes the plan to be more complex. In addition, because the general Community Park network backbone using optical fiber, so the edge switch placed in each building, resulting in network equipment distribution management. At the same time, the equipment's power supply, temperature, humidity, dust degree and other operating e

into several sub bands (or sub channels) and transmit 1 signals per sub channel. Frequency division multiplexing requires that the total frequency width is greater than the sum of each sub channel frequency, at the same time, in order to ensure that the signals transmitted in each sub channel are not interfered, we should set up the isolation zone between each sub channel, so as to ensure that each signal is not interfered (one condition). The charac

communication quality of short-wave channels is poor, but it mainly depends on the reflection of the electron. Microwave Communication Features: In space, it is mainly linear propagation. Category: Satellite Communication Advantages: Communication bandwidth Large communication capacity The received interference is small, and the transmission quality is high.

management system. In order to improve the spectrum utilization of the gold GHz band and expand the system capacity, the macro-cell adopts sector segmentation (optional sector angle), band refinement, and same-frequency multiplexing. Dynamic Power Control, antenna polarization, and frequency planning are used to overcome interference between different base stations and sectors. Optional values: 7 MHz, 3.5 MHz, and 1.75MHz. Optional values: 3.2 MHz, 1.6 MHz, 800 KHz, 400 KHz, and KHz. The broadb

With the rapid development of embedded technology over the past few years, the streaming media technology, which shows strong market demand on the personal computer platform, has gradually shifted to the embedded platform. Media consumption demands for personal portability and household appliances provide a market opportunity for this platform transfer. IPTV is at the forefront of this consumption revolution. Most people in the industry think that IPTV contains huge commercial benefits, but few

VOD (Video on Demand) is the abbreviation of video-on-demand technology, also known as Interactive VOD system. VOD is a new information service, which is the product of the development of computer technology, network technology and multimedia technology. It freed itself from the limitations of time and space, and solved the problem of what to watch and when to see. CATV Video on demand, refers to the use of cable television network, the use of multime

, the streaming media technology, which shows strong market demand on the personal computer platform, has gradually shifted to the embedded platform. Media consumption demands for personal portability and household appliances provide a market opportunity for this platform transfer. IPTV is at the forefront of this consumption revolution. Most people in the industry think that IPTV contains huge commercial benefits, but few people are still involved, one of the reasons is the speed of the network

cable TV (CATV) systems, it is insufficient to overcome some unique problems in the wireless environment, such as frequency offset, dynamic range, stray emission, multi-Longitude effect and fading. WRI enables stable and efficient system operation in the full-band (including registered or unregistered) by enhancing the DOCSIS standard. The enhancement content mainly includes: Multiple modulation modes, three modulation modes are adopted: downlink PSK

wires and the cost is significantly lower than WiMAX, but over time, once the development of WiMAX significantly reduces the cost, DSL technology will be threatened to be eliminated by WiMAX technology. Ii. WiMAX and Cable Cable Modem technology can be divided into two-way symmetric Transmission and non-symmetric Transmission. The symmetric transmission rate is 2 Mbit/s ~ 4 Mbit/s, up to 10 Mbit/s. The downlink rate of asymmetric transmission is 51 Mbit/s, and the uplink rate is 500 Kbit/s ~ 31

distribution frame. When designing a management subsystem, you must understand the basic design principles of the line and reasonably configure the components of each subsystem. Corning's LANscape integrated cabling solution has a complete set of scientific and easy-to-manage products for the management subsystem. 1-4. trunk system Backbone) and Network DesignTrunk subsystem refers to the routing of the trunk cable of a building. It is used to connect the main distribution rack and the intermed

adjustment. The realization of these functions requires a series of technologies to support, it mainly includes definition and measurement of interference temperature, dynamic spectrum allocation, transmission power control, and original user detection. (1) Interference Temperature The interference temperature was proposed by the FCC to characterize the interference that unauthorized users have on authorized user receivers in the shared band. The system sets an interference temperature threshol

purchase of materials is dominated by PVC pipes and various cables. The requirements of cables are strong and of good quality. Network cable, of course, needless to say, no matter whether or not you need a speed of m in the future, it is best to buy over 5 category twisted pair wires, telephone lines will be directly replaced by twisted pair wires. Because all kinds of cables must be pre-embedded in the ground or in the wall for long-term use and cannot be replaced at will, the quality of cable

background A group after many years of operation, the company's business and scale in the continuous development, the company's management and IT departments also recognize that through information technology can better support the company's business operations, improve the efficiency of enterprise production and management. With the completion of new office buildings, research and development buildings and workshops, IT departments need to plan and build the entire group's information and enter

and receive signals in different channels. C. disadvantages of a single cable structure: the use of complex components; the use of a frequency splitter. (3) three standard splitters in a single cable system and their low and high frequency band ranges A. subforking, with a low frequency band of 5 MHz ~ 30 MHz, the high frequency band is 54mhz ~ 300 MHz B. Center forking. The low frequency band is 5 MHz ~ 116 MHz, with a high frequency band of MHz ~ 3

. Several optical access methods 2.1 Optical Fiber Distributed Network (FDN)FDN is divided into active and passive optical fiber networks.The difference between a passive optical fiber network and an active optical fiber network is that it replaces a remote Optical Fiber Device (ROLT) in an active optical fiber network with a pair of optical passive splitter ). the transmission protocols used by the two are also different. The active optical fiber network adopts PDH or SDH transmission protocols

narrowband services, combined with Cable Modem and other technologies, it can economically access user-side broadband services. This is one of the commercial broadband service access technologies for users, namely, FTTC + HFCs ). The goal of Broadband Service Access Technology for users is to achieve FTTH at home through optical fiber, combined with the networking technology of PON in Passive Optical Networks and transmission technologies such as ATM and sub-carrier multiplexing SCM) and Dense

, uplink using QPSK modulation. Using these techniques, the downlink rate of the asymmetric cable modem system can be as high as 30Mbps and the uplink speed can reach 2.56Mbps. It includes a plurality of cable digital modems Cablelink cm2000d and one or more cable modem front-end system cablelinkhs2000d on the front end of the CATV. The hs2000d includes an RF modulation and demodulation module and a channel control module. The minimal configuration of

installation is successful root@m1:/home/hadoop#/home/hadoop/flume-1.5.0-bin/bin/flume-ng version flume 1.5.0 Source code repository: Https://git-wip-us.apache.org/repos/asf/flume.git revision:8633220df808c4cd0c13d1cf0320454a94f1ea97 Compiled by Hshreedharan on Wed could 7 14:49:18 PDT 2014 from source with checksum a01fe726e4380ba0c9f7a7d222db961f root@m1:/home/hadoop# The information above indicates that the installation was successfulV. The case of Flume1) Case 1:av