技术的进步推动着传统的电路交换向包交换转移。这种变化是全方位的，除了业务内容的增加，同时也带来了电信经营模式和收费标准的调整。就拿目前的带宽租用来说，常见的收费标准有２Ｍ，１０Ｍ，１００Ｍ这３个档次，这意味着一个想使用１５Ｍ带宽的客户不得不购买１００Ｍ带 Technological advances have driven the shift from traditional circuit switching to packet switching. This change is all-around, in addition to the increase in business content, but also brought the adjustment of telecom business model and charging standards. Take the current bandwidth rental, the common charges 2M, 10M, 100M these three grades, which means that a customer who wants to use 15M bandwidth had to buy 100M band