we want to kindly inform you about a scheduled maintenance work at KleyReX which will be performed on Wednesday 1st of December 2021 12:00:00 PM (UTC+2). Further details you will find in the list below. Please note that time frames are approximate, as unexpected delays can occur in case of any problems occuring. We endeavor to complete all maintenance as quickly as possible and thank you for your understanding. Start: Wednesday, 01-Dec-2021 12:00:00 CET End: Wednesday, 01-Dec-2021 16:00:00 CET Duration: 4 hours Impact: 60 minutes Location: Frankfurt Reason: Network improvement During our maintenance we will replace DWDM optics, adjust settings in the core network and update and reboot RS1 - RS3.