Railway transportation is backbone and subject of the transport network, is the key to building the comprehensive transportation network of China.
铁路运输是运输网的骨干和主体，是建设中国综合交通运输网的关键。
Packet Transport Network (PTN) technology includes the Transport Multi-Protocol Label Switching (T-MPLS) and Provider Backbone Transmission (PBT).
分组传送网(PTN)技术包括传送多协议标签交换(T - MPLS)和运营商骨干传送(PBT)。
Packet Transport Network (PTN) technology includes the Transport Multi-Protocol Label Switching (T-MPLS) and Provider Backbone Transmission (PBT).
分组传送网(PTN)技术包括传送多协议标签交换(T - MPLS)和运营商骨干传送(PBT)。
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