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Michael
Posts:7
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| 03/12/2008 8:18 PM |
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Is the symbol mapping table available via FTP so it can be loaded before the start of the trading day? If not, which option would be true:
1 - the symbol mapping table is sent each time a multicast group is subscribed to
2 - the symbol mapping table must be always be explicitly requested
3 - the symbol mapping table is sent over each multicast channel automatically at the start of the trading day. If the client's system connects too late, the mapping table must be explicitly requested.
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Kevin
Posts:19
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| 04/22/2008 9:36 PM |
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Michael,
I think these two entries in the FAQ section of the multicats specification document may address your question:
Q: How do I request the Symbol Index Mapping?
A: Symbol mappings can be requested by establishing a TCP/IP connection to the
Recovery/Retransmission Server. Subscribers must connect to the appropriate IP and port for the
desired symbol range. Subscribers can populate the symbol index field 0 in order to receive the full
symbol list that multicast group. The Symbol Index Mapping will be sent down the Refresh Multicast
Group (Request Based).
Q: How are intraday symbol adds handled in reference to Symbol Index Mapping?
A: The index mapping for a intraday symbol add is sent down the appropriated multicast channel before
any adds, modifies, deletes, or imbalances. This ensures subscribers can process inline without having
to issue a request. If the mapping update is missed or dropped inline, subscribers may request the
mapping through the Recovery Server.
The full doc is located here:
http://www.nyxdata.com/nysedata/NYSEArca/ArcaBook/tabid/293/DMXModule/1985/EntryId/3922/Command/Core_Download/Default.aspx
Regards,
Kevin |
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