Saturday Testing in Production Starting This Saturday, July 12, 2008

Beginning Saturday, July 12, 2008, CME Group will replay production-speed market data in the production environment for FIX/FAST and RLC formats, for 30 minutes every Saturday until October 4, 2008 from 11:30 a.m. to 12:00 p.m. Central Time (CT).

We recommend that all Quote Vendors purge and reload their instrument databases every week. To support testing during these replay windows, the FIX/FAST Security Definition (tag 35=d) and RLC Instrument Creation (MO) messages from the prior week will be available on the instrument definition channels each Saturday morning starting at 10:00 a.m.

Please reference the following market data channels and formats that will be replayed:

Channel Definitions

·          Certified FIX/FAST customers can access the channel definitions in XML format at ftp.cme.com

·          RLC channel definitions are available in PDF format at http://www.cmegroup.com/globex/files/MDPProdChannelDefs.pdf

Related Information

·          Saturday, August 30, 2008, the replay window will not be provided due to the Labor Day Holiday weekend

·          All data disseminated during the Saturday replay windows will be captured during the prior mid-week trading sessions

·          Support will be available at 312-715-6003 if quote vendors have any questions or concern during the Saturday replay window.

Please contact mdo@cmegroup.com if you have any questions concerning this notice. Thank you