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Mediacom Communications said Wednesday that it will relocate a major span of fiber optic cable to accommodate construction of the new Interstate 74 bridge between Bettendorf and Moline.

The move will take place between between midnight and 6 a.m. on Sept. 20 and will mean about 30,000 customers won’t have internet, phone or cable TV service during those hours, Mediacom says.

Business and residential customers whose services will be affected are in an area that extends from Bettendorf to Clinton and Maquoketa, and also includes a few communities in Carroll and Whiteside counties in Illinois. The largest customer area to be affected is in Bettendorf. A small part of Davenport north and east of I-74 also will be affected.

Mediacom is notifying customers that services will be off line during this time.

The company says the work to relocate the fiber optic lines will ensure the network isn't affected by the bridge construction.

When the new bridge is complete, the company said, it will route a part of its fiber optic network through the new conduit attached to the bridge. Mediacom says that this will allow it to add more sheaths of fiber to ensure that network capacity expands to keep ahead of future demand.