PTN Layer 2 technologies can be seen as a simplified version of the mechanism and OAM enhancements combination. In the realization of the technology, the two main technical PBT and T-MPLS will be a substitute for SDH, rather than the IP/MPLS competitors, similar to its network theory, are based on end to end, bidirectional point to point connection, and provides a central management, within 50 milliseconds protection switchover; either can be used to implement SONET/SDH to packet switching transition, in the protection of existing transmission resources, it can be similar to the existing SDH network functions to implement the network packet switched network transformation.

Overall, T-MPLS focus on solving IP/MPLS complexity, have a greater advantage in terms of carrier-class bearer; PBT focus on solving the shortcomings of Ethernet, device data service bearer in a relatively low cost. Standards, T-MPLS forefront; PBT forthcoming standardization work. Chip on the degree of support, at present, the chip supports MPLS Martini format can be used to support T-MPLS, higher degree of maturity and commercially available, and PBT technology needs multi-layer package of chips and other hardware configuration higher requirements, so gradually been abandoned by operators and manufacturers. Currently T-MPLS in addition to Vodafone and China Mobile, the world's top operators outside the large-scale application, based on the T-MPLS also launched more with the agreement and cost advantages of MPLS-TP (MPLS Transport Profile) standard, MPLS-TP standard can be on a smooth upgrade on T-MPLS standard, may become the best PTN technology system.