Notice to Members NTM2017-15

Date: March 17, 2017
Re: Maintenance to CH1 (350 E. Cermak)
Effective Date: March 24, 2017

OneChicago, LLC (“OneChicago”) is issuing this Notice to Members (“NTM”) 2017-15 to inform market participants that OneChicago will be performing updates and routine maintenance on our disaster recovery and user acceptance testing networks located at CH1 (350 E. Cermak). Maintenance will begin Friday, March 24, 2017 at 17:00 CT. Services will be restored the evening of Saturday, March 25, 2017. Customers with direct connections and VPNs may appear down during this time. Testing can be scheduled for Sunday, March 26, 2017 by reaching out to the Network Operations Center at

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If you have any questions, please contact OneChicago Operations at (312) 883-4311 or