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The radar data broadband that is based on SDH technology transmits a technology
From; Author:Stand originally
2, SDH technology overview
By the standard with one scalar a complete set of deferent structure forms SDH deferent network, apply to all sorts of classics comfortable the net negative charge that matchs processing is on the physical medium such as fiber-optic, microwave, satellite undertake conveying. This standard became the new standard SONET of American number system 1986, ministry of standard of international Telecommunication Union (ITU-T) 1988 year the rechristen after editing SONET is synchronous number series (Synchronous Digital Hierarchy, SDH) , make make the current technology system that applies to fiber-optic, microwave, satellite to convey at the same time.
SDH technology has the network node interface with unified whole world, simplified thereby the each other of signal is connected and of signal deferent, answer with, alternate join and commutative process, it has the information structure order and degree of a standardization, call STM (Synchronous Transport Module) of synchronous and deferent module. Its basiccest module is STM-1, STM-4 and STM-16. SDH is used bear the weight of of information is structure of frame of a kind of lump, lump frame by fore-and-aft travel and 9 transverse 270×N list gulp to become. Whole frame structure by paragraph 3 parts form area of expense area, clean carry on one's shoulder and division of administrative unit indicator. Area of its middle expense basically uses at the network move, management, safeguard reach point to match, in order to make sure information can convey neatly normally, manage unit finger to use an instruction the information head byte inside area of clean carry on one's shoulder the exact position inside STM-N frame, so that receive when can correct depart carries on his shoulder or back completely. Area of clean carry on one's shoulder is used deposit the bit that is used at information business and a few the passageway expense byte that is used at the passageway to defend management.
When the frame of SDH is transmitted, by by left right, by small discharge to large order bunchy model code shedding is ordinal undertake. Every frame transmits time to be 125μs, every second transmits frame of 1/125×106 =8 000. To STM-1 character, the bit number that every frame can transmit is 8×(270×9×1)=19 940 Bit, criterion the transmission rate of STM-1 is 19 440×8 000=155.52 Mbit/s, and STM-4 is 2 488.320 Mbit/s for 622.080 Mbit/s, STM-16.
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