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ＩＳＭ－４设备在线改造成环在我国是首例。北环网在线 优化改造成为６２２Ｍｂｉｔ／ｓ速率的通道保护环，解决了 北环电路资源利用率低和安全性差的问题，这将为我 省电信发展带来巨大的经济效益和社会效益。
ISM-4 equipment online transformation into a ring in our country is the first case. North ring network optimization transformation into 622Mbit / s rate channel protection ring, to solve the North Central circuit resource utilization and low security problems, which will bring tremendous economic and social benefits for the development of telecommunications in our province.