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Please refer to Exhibit A of the Customer Connection Agreement for the current fee schedule applicable to this service. |
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Warning Due to load balancing and optimization of the iLink order entry infrastructure, the aggregation of Source session data under a single Drop Copy group is subject to constraints that may require a customer to maintain multiple Drop Copy Target sessions. Customers must be able to accommodate this contingency. |
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| Term | Definition |
|---|---|
| Administration Messages | Message types used to establish and maintain a FIX session, e.g. Logon. |
| Application Messages | Message types sent over a session to perform business functions, e.g., New Order. |
| Drop Copy Group | A customer-defined group of Target Sessions, which are a group of iLink source sessions to which drop copy data will be delivered (e.g., all the iLink sessions for a given business unit, trading customer or clearing firm). |
| Source Session | Client iLink session from which the Drop Copy Application messages originate. A given iLink source session ID will be in one target session. |
| Target Session | Exchange defined FIX session over which drop copy data is delivered. A single Drop Copy Group may have multiple Target sessions based on the configuration characteristics of the Source sessions which feed the Drop Copy Group. |
| Gap Fill | Notification of missing messages sent to client system with the Sequence Reset (tag 35-MsgType=4, tag 123GapFillFlag=Y) message. For Drop Copy, this message alerts the client system to initiate the Application Resend. |
| Resend | The process by which, in the event of missed messages, the client system requests and Drop Copy resends the missed messages using the FIX Resend – Standard FIX resend process using the iLink 2 Resend Request message. |
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Technical Specifications
The following topics provide the technical details for each Drop Copy feature.
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