Solutions for Time and Frequency Synchronization

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Solutions for Time and Frequency Synchronization Products Info/Specs Support FAQ Downloads About Meinberg Contact Search Glossary RMA Request Remote Support Time Synchronization in Telecom Networks Related Pages GPS Satellite Receiver OEM Board Precise Time Synchronization for Telecom Networks.     What is time synchronization and how does it work? Which solutions exist for telecom networks and attached networks? Which accuracy and stability is required? Why should manufacturers and ope
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    Solutions for Time and FrequencySynchronization   Products Support   DownloadsAboutMeinberg   ContactSearch   Info/Specs   FAQRMA Request   Remote Support   Glossary   Time Synchronization in Telecom Networks Precise Time Synchronization for Telecom Networks.    What is time synchronization and how does it work?    Which solutions exist for telecom networks and attached networks?    Which accuracy and stability is required?    Why should manufacturers and operators of equipment for telecomnetworks care about these terms?This document has been created to answer these questions and offers you acomprehensive and easy-to-understand introduction. Read on ... Many Thanks to Mr. Gerd Backhaus for his friendly support at this publication!    RelatedPages GPSSatelliteReceiverOEMBoard Low costOEMmodule forsynchronization oftelecomnetworks,transmittersand basestations Generation of E1-T1Clock     Telecom Time Synchronization Overview     Telecom Time Synchronization Equipment     Examples of use     Telecom Time Synchronization Terms and Glossary  Telecom Time Synchronization Overview   Network synchronisation is an important task to get excellent performanceand quality of service for the subscribers. Diagram of Clock Stability and Accuracy click on the picture to zoom the diagram!   Communication requires excellent quality of service in the network!     Synchronization equipment, planning and installation account for 1% of theoverall project equipment costs. Synchronization must be considered andplanned from the very beginning of a project. If the manufacturer cannotdeliver synchronization equipment, he must inform the customer so that the   customer can take steps to:    Identify appropriate synchronization equipment    Plan system synchronization appropriately    Seek a Time & Frequency Specialist if necessary Otherwise the performance in the network will suffer and will notcomply with the ITU (International Telecommunication Union)standard. After an inventory of the hardware available, a preliminary network overviewis made including the available timing reference sources. This can be usedto plan the synchronization of switching devices. For transmission network   synchronization (SDH),a plan must be developed with a special sync   planning tool.In ITU-Recommendation G.811 (Timing Characteristics of Primary Generationof referenceclocks forsynchronization tasks,the outputsignals areavailablewith highaccuracyand stability. NTP TimeServer LANTIMEM900 NTPServer -Time ServerPlatform forCustomizedTime andFrequencySynchronization Systems PTP IEEE-1588-v2TimeServer PTP/IEEE1588Grandmaster Clock andNTP TimeServer withintegratedGPS radio  Reference Clocks) a network clock stability of 1 x 10 E-11 for the PrimaryReference Clock (RPC) is recommended.This accuracy is derived from 1 acceptable slip in a 2 MBit/s transmission in   an observation time of 70 days.1 (frame) = 125 us 125 us / 70 d x 24 h/d x 3600 s/h = 2 x 10 E -11 or +-1 x 10 E -11  This clock stability can be generated by atomic clocks only!There are different possible approaches to achieve the required accuracy.Different solutions are possible and can be realizedusing MEINBERG timing equipment. clock PTP/IEEE1588OrdinaryClock TheMeinbergSyncBox/PTP simplifiesa migrationtowardsPTP/IEEE1588 byproviding awide rangeof legacytimesynchronization outputs. MEINBERG: QualityManagementSystem  125µs   Signalling Information or digital signal Coded speech signal or digital signals in slot 1 - 15Coded speech signals or digital signals in slot 17 - 31 Time slots168 bitBit1Bit8 (FAS)Frame Alignment Signalin Frames 1, 3, 5,...(NFAS)Non Frame Alignment Signalin Frames 2, 4, 6,... X 0 0 1 1 0 1 1X 1 D N Y Y Y Y488 nsD: Service bit for critical alarm (Alarm D=1) N: Service bit for major alarm (Alarm N=0) X: Reserved bits for international use Y: Reserved bits for national use Synchronization with MEINBERG Equipment
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