Both the NAMC-STM1 and the NAMC-STM4 are telecommunications interface boards in the Advanced Mezzanine Card (AdvancedMC or AMC) form factor. The NAMC-STM1/4 are targeted at telecom applications dealing with Synchronous Digital Hierarchy (SDH), such as SS7, ISDN or 3G/3.5G mobile applications in optical OC-12/STM-4 and SONET environments.

Equipped with an add/drop multiplexer/demultiplexer chipset, the NAMC-STM1/4 are ideal single board platforms to interface between the frame-oriented STM-4/SDH networks and classic TDM (Time Division Multiplex) standards as E1/T1/J1 or E3/T3/J3. Possible applications are add/drop or terminal mulitplexers.