Joe
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| 05/28/2008 12:42 PM |
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Symbol sequence numbers are useful when tracking a subset of (the broadcast) symbols since they allow one to detect if a lost datagram included any of the tracked symbols. Put another way, one would look for gaps in the symbol sequence number rather than the Msg sequence number to trigger a refresh request. However, the doc for ARCA multicast says:
"Please note that the sequence number while it
increases serially, it does not increase monotonically"
Too bad: this renders the SourceSequence number unusable for this purpose.
It would be a REALLY good idea to include a proper symbol sequence number. It will help you in the long run as it is it would likely reduce the number or repair requests handled by the head end.
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Ariel
Posts:163
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| 06/04/2008 4:35 PM |
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| There is a typo in the spec, the sequence number does increase serially AND monotonically |
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Roi (guest)
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| 07/11/2008 3:50 AM |
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| Are you sure the Symbol SeqNum increase monotonically? I see gaps (of 1) without losing any packet (msgSeqNum is full). |
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Lydia
Posts:68
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| 08/05/2008 11:51 AM |
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Thank you for your inquiry. We will respond shortly.
Regards,
NYX Data Team |
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Suresh (guest)
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| 12/01/2008 12:47 PM |
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Can you guys(ARCA) confirm if the symbol sequence numbers increase serially (increment of 1) always. We always see the sequence number jump (most of the time 1 or 2).
Thanks,
Suresh |
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