It is the trend that Transmission network is from MSTP to PTN .under this background as network to all-IP evolution in the terminal, such as mobile phones, PC can achieve a variety of IP-based service access, business users have full use of routers, switches and gateways, servers, firewalls, under operational control of the various networks have gradually and it has turned to IP-based transmission network in order to achieve top business efficiently carried evolution from MSTP to PTN is the trend. That is Why PTN transmission become mainstream network is an inevitable trend
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