| 摘要 |
Improvements to scheduling of calls on a three stage network are provided. A multicast call is divided into plural portions which are scheduled separately. Protection channels are scheduled with primary channels by augmenting a call with an input switch containing the protection channel. Calls are scheduled on a set of free middle stage switches or time slots and are then added to a primary set. On occasion, the primary set is recompacted. Different sets of calls may be scheduled on different sets of middle stage switches or time slots, and each set may rely on a different scheduling algorithm.
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