[Photo] Discussion on the microwave radio and television digital transformation – microwave, radio, television, digital – HC network broadcasting industry
View of the irreplaceable advantages of microwave transmission and digital microwave the many advantages of microwave digital transformation imperative. System of digital microwave technology has been identified as synchronous digital hierarchy (SDH), to allow temporary use of DVB multiplexing modulation directly address the digital transition. This is the State Administration of Radio Digital Transformation in the microwave raised guidance.
SDH (SynchronosDigitalHierarchy) devices are not part of microwave equipment category, which is a different rate to the flow of data collection, exchange and distribution, multiplexing equipment, it can be seen as the role of the container. Because of this multiplexing approach to data stream management, maintenance and loading zone is divided into two parts to the different rates of data streams can be transmitted easily download and upload that is cross-linked (DXC), save a quasi-synchronous digital hierarchy (PDH) required a large number of multiplexing equipment, the cost saving and convenient to use.
Digital optical transmission and digital microwave transmission can use SDH technology. China's radio and television transmission networks is the use of SDH optical fiber transmission. After transformation of microwave digital cable must be connected, sharing, mutual backup, you must also use SDH technology. SDH digital microwave equipment in the role, from Figure 1, the basic model of microwave relay station is visible.
Figure 1 The basic model of microwave relay stations
SDH equipment, the following form part of the device configuration to SDH45Mbit / s Interface signals, for example, in Figure 2.
Figure 2 SDH equipment, the following form part of the device configuration
Can see from Figure 2, SDH transmission over a microwave circuit can also be a fiber optic cable. SDH equipment, the following configuration (including SDH equipment), whether or cable circuits in the microwave circuit are the same.
Temporary use of the direct multiplexed DVB modulation as a transitional program, keep the original simulation of microwave station microwave channel machine, space feeder and power supply system, only simulation of microwave Modem The following section for replacement, increasing number of modem, d Decoder , ASI Multiplexer. The basic model to end station, for example, in Figure 3.
Figure 3 DVB Direct multiplexing modulation
Using DVB multiplexing modulation direct advantage of a one-time investment by half, to improve investment conditions in the second transformation may be as long as the replacement of microwave equipment, increase the SDH multiplexer and Network Management Monitor System, with the first transformation into the codec, multiplexer, etc. can be composed entirely of SDH microwave. The disadvantage is not, and optical transmission network in the TS stream level mutual backup, could only play in the signal source level backup role.
In short, the simulation of microwave has completed its historical mission, is bound to be more advanced replaced by digital microwave. At present, Dalian has completed the digital transformation of the microwave, Guangdong Province and Gansu Province was also brewing or ongoing transformation of the digital microwave. Microwave with fiber-optic networks, satellite network interconnection, can form a rational allocation of business, mutual backup, secure and reliable radio and television transmission networks, as an important strategy to ensure the safety of air resources.
References: Digital Microwave communication Tsinghua University Press
Microwave relay communication on Demao series Water Power Press
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