Anritsu MP1656A 2488.32 Mb/s Digital Data Analyzer The MP1656A was designed for use with the MP1570A SONET/SDH/PDH/ATM Analyzer to allow analysis of section, H-path (AU), L-path (TU), PDH, etc., for STM-16 layers. The MP1656A is a compact, lightweight solution if you need to add STM-16 capability to your MP1570A. The MP1656A can also be used alone to perform regenerator section tests.