作为NGN在传输网的关键领域，自动交换光网络(ason)已经引起各个运营商足够的重视，即将进入规模部署阶段。
As one of the key fields of NGN, automatic switched optical network (ASON) has been paid great attentions by carriers and will enter a stage of large-scale deployment.
为适应采用交换机网络进行通信对传输网本身可靠性提出的要求，介绍了IEC62439标准描述的高实用性自动网络通信协议。
To meet the requirement of switch-based transmission network for communication reliability, IEC62439 protocol is introduced and PRP (Parallel Redundancy protocol) is adopted.
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