Also see metropolitan area network ( metropolitan area network ).
BMAN (Broadband Metropolitan Area Network) is a telecommunications service from Sprint in the U.S. that provides corporate users in a metropolitan area with broadband access to the Internet on optical fiber lines in a system that preserves a connection even when one line is cut or fails. Using existing and supplemented infrastructure, BMAN uses a series of interlocking ring s so that a connection can be restored within 60 milliseconds if a single line goes down. The system uses Synchronous Optical Network multiplexing . BMAN is the metropolitan part of Sprint's overall national network, which it calls ION (Integrated On-Demand Network).