Urumqi Railway Bureau cable segment just Over the years a number of cable television stand
charge management system, take a lot of detours, the application of digital television will finally be resolved on the image transmission quality, charge management control of all the problems.
1, analog cable television under the charge management system
Cable television shows since the emergence of the trend of rapid development, China now has grown to more than 100 million users, billions of annual subscription fees. As the charges and administration coupled with poor television ratings, according to incomplete statistics, China's cable TV customers more than the annual subscription fees are Jinliang Cheng (nearly 3 million) can not be charged.
View of this situation, back in 2078 around the cable before the user began using a variety of ways for users to charge management. From the current situation, most of the following ways.
1, can be addressed
This approach required the distribution of the original system to transform network, works in large quantities, equivalent to re-build a network of other addressable need to be placed in a central hub location, cottage within 30 meters around users need to be a cable connected to the addressing -5 hub, and then for each hub with -7 or -9 cable connection, cable supplies is higher.
Install hub as more cable together, cottage wiring installation requirements specification, process and strong, the building re-threading during installation is relatively difficult, and higher installation costs.
Addressable output ports hub mostly even, in some users singular focus point would have to waste a single output port.
Distributed network addressing hundreds of thousands of terminals, active devices such as power supply is not normal or thunderstorm season, or port damage caused by power supply circuit coupled with the quality of the product itself will significantly increase the transmission the fault.
General points addressable scrambling type, or both based off of three, based on the level shutdown input has certain requirements, when a higher level or beyond the prescribed range, the signal on will not clean off, or even most of the channels the user can still watch. While scrambling type can do so without the user image can not normally be paid to watch, but the scrambled images will have damage to normal, thus reducing the image index.
Addressing the following are only on the output signal to the client's control, not eradicate some input in addressing the phenomenon of private access.
Than RF addressable scrambling is relatively simple, just in front of the output RF signal scrambling, room number and cost of required equipment and addressable system similar to the front, but there is no right modification to the network, each user only a single decoder can be configured. But this program also has some shortcomings, if the client or user level inhomogeneous limit the time just to connect decoder, television ratings will be more poor. This will be the same scrambling on the image to a certain degree of damage. I am China Manufacturers writer, reports some information about butyl rubber gloves , cotton knitted gloves.
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