This interface module delivers 6 ports of ear and mouth (E&M) interfaces. The design emphasizes Smart Grid and low-latency application environments. Typical use cases for this module are teleprotection and Land Mobile Radio applications. The module supports E&M type I, II, III, and V on 2- or 4-wire modes with selectable 600- or 900 Ohm impedances. The physical connectivity on the interface module is using standards-based RJ-45 connectors. The E&M signals and voice data can be transported using CESoPSN with and without Channel Attached Signaling (CAS) over MPLS.