In order to reduce a storage area for storing time information necessary to manage transmission timing of a plurality of cells in an asynchronous transfer mode type exchange, a shaper for use in the ATM exchange employs a plurality of cell transmission queues each having a different class. If there occurs...http://www.google.com.au/patents/US6249511?utm_source=gb-gplus-sharePatent US6249511 - Apparatus for controlling cell transmission timing
