Oversubscription is not the same as overselling, provided that the oversubscription ratio, for a given number of subscribers traffic, which is multiplexed over time, does not significantly impact performance. A significant impact to performance might be one in which the performance of the oversubscribed portion of the network is less than that of the end to end service that the subscriber is using. In other words, oversubscription works because not everyone uses it at the same time.