There is going to be a significant outage in Chicago, that I thought might be of general interest to the NANOG community. The Ameritech exchange point in Chicago is undergoing scheduled maintenance this Sunday (3/14) early morning. Following is the text of the notice that went out to customers on 2/22. Customers with additional questions are encouraged to contact me directly. thanks, Mark Cnota Ameritech ====snip====

We, Ameritech Advanced Data Services, are informing all of our NAP customers that on Sunday, March 14th we are going to have a maintenance window from 12:00am to 6:00am CST that will be service affecting. AADS is going to perform an ATM switch migration from the Lucent GCNS 2000 to an Ascend 550/500 platform.

During this migration your circuit will go down and for how long is not determinable at this time, but will be kept to a minimum. In most cases all that is required is a cross connect change. The PVC's that each customer has will be duplicated in the new switch and your VPI/VCI will not change.

In the event that you seem to be experiencing problems beyond the scheduled maintenance window, call the AADS NMC (NOC) at 1-800-972-3441 with your Ameritech circuit ID and indicate that you are a NAP customer. International customers can call 1-847-562-7690 for trouble reporting.

We appreciate your understanding and patience during this time.

Sincerely, Kevin Peterson Operations Manager AADS

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