Transmission and Multiplexing (TM) Physical and Electrical Characteristics of Hierarchical Digital Interfaces for Equipment Using the 2048 Kbit/s- Based Plesiochronous or Synchronous Digital Hierarchies
This ETS describes the requirements for the physical and electrical parameters of interfaces based on CCITT Recommendations G.702 [1]@ G.703 [2] and G.707 [3] for interconnection of digital network elements: - in-station (i.e. for distances below a few hundred metres); - using metallic (symmetrical or coaxial) pairs; - at 64@ 2 048@ 8 448@ 34 368 and 139 264 kbit/s hierarchical levels of the Plesiochronous Digital Hierarchy (PDH) and at the first level of the Synchronous Digital Hierarchy (SDH) (STM-1 at 155 520 kbit/s). This ETS also describes the requirements for the physical and electrical parameters of the 2 048 kHz synchronisation interface.