Up to now, PSTN providers have invested a lot of costs in building and maintaining their bone networks and subscribers cycle circuit.
到目前为止，世界范围内的PSTN供应商已经投入了巨大的成本，包括建设、维护骨干网和用户环路。
At the same time, P2P application consumes the majority of the bandwidth, causing connection circuit capacity expansion failed to catch up with the demand of Internet subscribers.
同时，P 2 P等应用占用了大量带宽资源，使运营商网间电路扩容进度跟不上用户对互联网带宽的需求。
At the same time, P2P application consumes the majority of the bandwidth, causing connection circuit capacity expansion failed to catch up with the demand of Internet subscribers.
同时，P 2 P等应用占用了大量带宽资源，使运营商网间电路扩容进度跟不上用户对互联网带宽的需求。
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