catv modulator

A pay cable TV network plans to relay an important football match. Their broadcast network and user terminal constitute a tree structure, the root node of the tree is located at the scene of the football match, the leaves for each user terminal, and other transit points for the tree's internal nodes.Signal transmission costs from the retransmission station to the retransmission station and from the retransmission station to all user terminals are known, and the total cost of a retransmission is

, which is not required for low-frequency systems. For a single-cable broadband system, the amplifier must be bidirectional . D. and foragger: The function is to divide an input into two outputs, or combine two inputs into one output; E. Controller 4.1.3 comparison of baseband and broadband systems (1) baseband system Advantages: modem is not required and the price is low. The structure and technology are simple and easy to install; Disadvantages: only one channel; limited capacity; limited dist

@ localhost root_fs] # ls-l Total 12 Drwxr-XR-x 2 root Root 4096 Oct 19 05: 41bin Lrwxrwxrwx 1 Root 11 Oct 22 11: 17 linuxrc-> bin/busybox Drwxr-XR-x 2 root Root 4096 Oct 22 18: 43 sbin Drwxr-XR-x 4 Root 4096 Oct 22 16: 52usr Go to the bin directory and you can see that all these files are links to busybox (except busybox itself ). [Root @ localhostroot_fs] # ls bin-l Total 0 Lrwxrwxrwx 1 Root 7 Oct 22 11: 17 addgroup-> busybox Lrwxrwxrwx 1 Root 7 Oct 22 11: 17 adduser-> busybox Lrwxrwxrwx 1 Ro

Use the timestamp column type, Column Type display format Timestamp (14) yyyymmddhhmmss Timestamp (12) yymmddhhmmss Timestamp (10) yymmddhhmm Timestamp (8) yyyymmdd Timestamp (6) yymmdd Timestamp (4) yymm Timestamp (2) YY It will automatically mark your insert or update operations with the current date and time. If a table has multiple timestamp columns, only the first one is automatically updated. In the following cases, MySQL automatically updates the first timestamp column as the current

generally uses DMT modulation to implement digital transmission on a pair of Copper Twisted Pair wires. the downlink speed of VDSL can reach 13 ~ 52 Mbps, uplink speed up to 1.5 ~ 7 Mbps, the transmission distance is about 300 meters ~ 1.3 km. Fttx + LAN Fttb + LAN (LAN) broadband access network in fttx is the most reasonable, practical, and cost-effective broadband access method.CommunityAnd 10 MB to the building and 10 MB to the user. It provides high-speed access for residential users. I

DefinedWhen the optical fiber is transferred to the joint, a certain amount of loss is called weld loss or continuous loss.ReasonThe optical fiber fusion loss is mainly composed of the transmission loss of the optical fiber and the weld loss of the fiber weld joint. Because the optical fiber connection quality affects the optical fiber transmission loss's passenger limit, the optical fiber line does not relay the transmission distance and so on the parameter, therefore should reduce the optical

method, that is, a convenient way to find online users; To improve efficiency and convenience to end-users, some of the addresses can be used directly as domain names, and as a result of the use of the original computer networks, The service of CATV Network and Telecommunication network is classified and coded, so it is also called "New generation security and reliable information integrated network protocol". Decimal network refers to the use of de

Go language data collection DescriptionPublish site GitHub CSDN Sina Last updated 2012-01-21 collation optimization format, add more content, see the change record origin explanation want to learn the new language of the hand, found that go after very interested, also put some of the information to be contacted to share out.If there are errors or omissions in the information, or we have better suggestions, welcome to mail contact to see the collection of recommended collection principles as far

interconnection with the world's large-scale construction of SDH networks. The purpose of using the SRP protocol is to identify each IP packet in the cascaded net load of SDH and provide bandwidth reuse/reuse and other control functions. It is precisely because DPT uses SDH in frame format that DPT can operate on all current fibre-optic transport infrastructures, including: * Bare Optical fiber (Dark fiber); * Wavelength Division multiplexing Equipment (DWDM); * Sdh/sonet point-to-point pat

cost. That is, to solve the problem of the up/down path in the optical fiber transmission system, it is necessary to minimize the cost of inserting/splitting wavelength. Optical fiber for transmission The application of optical fiber technology in transmission system is firstly realized by various optical networks. Up to now, the topology structure of all kinds of optical fiber transmission network can be divided into three kinds: Star shape, total shape and ring. Furthermore, from the layere

wisdom the tool, provides the omni-directional information exchange function, helps the family and the outside to keep the information exchange unimpeded, optimizes people's life Help people to effectively arrange time, enhance the safety of home life, and even save money for various energy costs. Modern society's home life, not only to be convenient and comfortable, but also intelligent, entertainment, security, which requires a good home wiring system. Home wiring is the home room of the "me

, reliability, QoS guarantee, multicast, business separation and so on to meet the new value-added business development. Gepon technology has great advantage in broadband access, has incomparable features such as ADSL and LAN, and more efficiently meets the demand of FTTH multiple service access than Apon, Bpon, GPON and MSTP. In the early stage of the market FTTH application, the Gepon system will be a good choice for the new upscale community and the existing cell bandwidth expansion. Gepon sy

of the CATV, or receive satellite signal, video camera sent live broadcast program  audio and video signal, the signal sent by the VCR and other foreign signals, sent to the MMDS launch system, after processing feed to the launch tower, and then by the antenna launch, the antenna can be a fully-shaped 360°), heart-shaped 180°, Fan 45°,80°,110°. Within certain coverage, the client's RF system receives the MMDS signal and is processed to the user t