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Difference between revisions of "HiPath Cordless IP - IEEE 1588"

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= '''HiPath Cordless IP: Synchronisation per Ethernet (regarding IEEE1588) <br>''' =
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== Overview ==
  
In difference to the HiPath Cordless IP synchronization over air, the Ethernet based synchronization mechanism (according IEE1588, PTP [[wpen:Precision_Time_Protocol|Precious Time Protocol]]) requires fewer configurations. <br>On the other hand, great demands are made on the Ethernet characteristics like loss, delay, jitter etc. Therefore special requirements regarding the Ethernet components (especially to the Ethernet switches) have to be considered. If these values (especially jitter) are bad Sync loses are likely. Please remember, if a HiPath Cordless IP&nbsp;base station loses the Sync it will not accept any calls and will try to resync.  
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In DECT systems with a circuit-switched connection, e.g. HiPath Cordless Office systems, the synchronization information required to synchronize the base stations is derived from the UP0 connection.  This is not possible in IP systems.
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However, accurate time synchronization between the DECT IP base stations is vital for a seamless call handover.<br>
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Two methods of synchronization are provided by HiPath Cordless IP, both can be mixed in one system.
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<br>
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'''synchronization via DECT (radio/air synchronization)'''<br>
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In order to synchronize with another DECT IP base station via the DECT interface, a DECT IP base station must be within the overlap area of the radio cell that forms this DECT IP base station.
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In addition, the DECT IP base station can be synchronized on other DECT IP base stations, which increases the availability of synchronicity in this cluster.
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'''synchronization via LAN'''<br>
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One DECT IP base station can by synchronised via LAN with other DECT IP base stations. This is done via the IEEE Standard Precision Time Protocol (PTP)
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IEEE1588.
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In difference to the HiPath Cordless IP synchronization over air, the Ethernet based synchronization mechanism (according IEE1588, PTP [[wpen:Precision_Time_Protocol|Precious Time Protocol]]) requires fewer configurations. <br>On the other hand, requirements are made on the Ethernet characteristics like loss, delay, jitter etc. Therefore special requirements regarding the Ethernet components (especially to the Ethernet switches) have to be considered. If these values (especially jitter) are bad Sync loses are likely. Please remember, if a HiPath Cordless IP&nbsp;base station loses the Sync it will not accept any calls and will try to resync.  
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<br> <br>
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'''Summary:'''<br>
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The main advantages of Synchronisation via LAN are:<br>
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- more flexibility in the location of the DECT IP base station - no need to built synchronisation chains as with synchronisation via DECT,<br>
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- less DECT IP base stations are required, because the overlapped area of DECT IP base station is less, <br>
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- configuration of DECT IP systems is simplified, because all DECT IP base stations can be synchronised to only one synchronisation master <br>
  
 
== Basic requirement to the LAN to use Sync over LAN  ==
 
== Basic requirement to the LAN to use Sync over LAN  ==

Revision as of 15:54, 7 March 2011