Synchronous digital communications system

This invention relates to a synchronous digital communications system as set forth in the preamble of claim 1 and to a method of optically transmitting electric signals as set forth in the preamble of claim 6. The synchronous digital communications system according to the invention serves to transmi...

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Bibliographic Details
Main Author Wolf, Michael Joachim
Format Patent
LanguageEnglish
Published 25.05.2004
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Summary:This invention relates to a synchronous digital communications system as set forth in the preamble of claim 1 and to a method of optically transmitting electric signals as set forth in the preamble of claim 6. The synchronous digital communications system according to the invention serves to transmit electric signals optically. The electric signals to be transmitted are converted from electrical to optical form (E/OE/OE/On) and then transmitted using wavelength division multiplexing (WDM) or dense wavelength division multiplexing (DWDM). A synchronization manager and a connection manager are provided. The synchronization manager is adapted to configure dedicated optical synchronization links. The connection manager is adapted to configure switched optical communication links from a pool of wavelengths, taking account of the dedicated synchronization links only. This has the advantage that independently of the switched communication links, synchronization is constantly ensured throughout the system. Each network element (NE, NE, NE) has at least one interface unit that is reserved for synchronization and that continuously receives signals at the wavelength ( ) reserved for synchronization.