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The MDBS lies within a cell site. It uses the same antenna as the voice network to receive and send data between the MES and the MD-IS. The MDBS is mainly responsible for channel matters. While CDPD calls are taking place, the MDBS monitors the channels to detect the existence of competing voice calls, and also monitors all unused channels to find suitable "hopping" channels. A hop occurs when a CDPD call must give up its channel for a voice call. Hops also occur when a user moves from one
service area to another, such as from one base station's coverage area to another's.
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