IETF RFC 5960
MPLS Transport Profile Data Plane Architecture
This IETF Request For Comments (RFC) provides useful background information on the transport of Carrier Ethernet services over MPLS networks.
Abstract:
"The Multiprotocol Label Switching Transport Profile (MPLS-TP) is the set of MPLS protocol functions applicable to the construction and operation of packet-switched transport networks. This document specifies the subset of these functions that comprises the MPLS-TP data plane: the architectural layer concerned with the encapsulation and forwarding of packets within an MPLS-TP network. This document is a product of a joint Internet Engineering Task Force (IETF) / International Telecommunication Union Telecommunication Standardization Sector (ITU-T) effort to include an MPLS Transport Profile within the IETF MPLS and Pseudowire Emulation Edge-to-Edge (PWE3) architectures to support the capabilities and functionalities of a packet transport network.."
More links relating to MPLS-TP can be found at the Wikipedia page on this topic.