Transport MPLS(T-MPLS) hierarchy(TMH) is the key point in recent transport network technology study.MPLS is the important solution for IP technology and increase of QoS.Current transport network is still TDM based(e.g.SDH) optical transport network.How to transport MPLS client in exist transport network
every one is taking care.Since the requirements of network interconnection or interwork
the uniform specification of interfaces is necessary.The specification of TMH interfaces were introduced in this paper
include location of TMH interface
NNI basic signal structure
information structure for T-MPLS NNI
T-MPLS labels
multiplexing and mapping principles and physical specification of the T-MPLS interfaces etc.