Transmission and Multiplexing (TM) - Generic requirements of transport functionality of equipment - Part 4-1: Synchronous Digital Hierarchy (SDH) path layer functions
Transmission and Multiplexing (TM) - Generic requirements of transport functionality of equipment - Part 5-1: Plesiochronous Digital Hierarchy (PDH) path layer functions
Transmission and Multiplexing (TM) - Generic requirements of transport functionality of equipment - Part 2-1: Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) physical section layer functions