Xetra® T7 EMDI is one of the three interfaces that Xetra T7 uses for public market and reference data distribution via UDP multicast. This interface provides un-netted market data. The updates of the order book are delivered for all order book changes up to a given level; all on-exchange trades are reported individually.
The Xetra® T7 EMDI provide the following information to the participants:
- Price level aggregated order book depth and trade statistics 1
- Product and instrument states
- Quote requests and cross requests
- Information on newly created complex and flexible instruments (derivatives only)
Xetra®T7 EMDI publishes market data information following FIX 5.0 SP2 semantics and is a FAST 1.23 encoded interface. If any messages are lost, complete recovery is possible because every message is published on two identical services (A and B) with different multicast addresses (live-live concept). In the unlikely case that a message is lost on both services, participants can take advantage of the respective snapshot messages and rebuild the order book.
Xetra® T7 EMDI does not offer any layout-level backward compatibility feature between two releases, and within the lifetime of a release T7 reserves the right to change the behavior of some fields in the different layouts.
For further questions the Technical Helpdesk is at your disposal.