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Symbol offset

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smlt_vsat
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Mar 31st, 2009 at 8:19am  


Hi

What is symbol offset low means . i can see this condition in imoniotr
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smlt_vsat
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Reply #1 - Mar 31st, 2009 at 9:42am  

Hello ALL

Whats the error tells "Symbol offset below " . is it something bad on RX side ? what we have to check ?
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TDMAMike
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Reply #2 - Mar 31st, 2009 at 12:14pm  
Symbol offset (as observed thru iMonitor) is a timing correction value issued by the hub (to the remote) as the spacecraft moves in its station box.  It is normally a low number (around 5-10 up to 200-300). The hub literally monitors every burst from the remote and issues offsets to ensure that the remote remains centered in it’s time slot.  Adjustments are made (by the network) to the symbol offset every 20 seconds through the UCP (Uplink Control Process) in an effort to keep the burst centered.  For reference, SO = ˝ Acquisition Aperture.

If you are getting SO warnings, there is a timing issue.  



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« Last Edit: Apr 1st, 2009 at 3:01am by TDMAMike »  

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smlt_vsat
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Reply #3 - Apr 6th, 2009 at 4:41pm  


if there is any warning , what we have to check ?
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TDMAMike
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Reply #4 - Apr 6th, 2009 at 5:04pm  
How is it being observed?  Single remote or several?

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smlt_vsat
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Reply #5 - Apr 6th, 2009 at 7:19pm  


just single remote
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TDMAMike
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Reply #6 - Apr 6th, 2009 at 11:26pm  
Do you have access to the TAC?
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smlt_vsat
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Reply #7 - Apr 7th, 2009 at 6:36pm  


ya sure
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TDMAMike
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Reply #8 - Apr 7th, 2009 at 8:54pm  
I would start with re-confirming the exact geo coordinates for the remotes location.  Since your other remotes are not reporting this warning, it appears to be isolated to the single node so re-confirming the Hubs geo coordinates is not needed.  Have the remote pinpoint its location in lat/long DMS.  Make sure it is as accurate as possible and add the digits to iBuilder (GEO TAB) and reset the remote (tcp)


M
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« Last Edit: Apr 8th, 2009 at 11:59am by TDMAMike »  

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