These Transmit and Receive Balun Adapters provide a low cost solution for connecting a balanced 120Ω twisted pair interface to an unbalanced 75Ω coax network, or, vise versa. The Balun Adaptors provide isolation protection and impedance matching, enabling 75Ω coaxial networks to interface with 120Ω twisted pair equipment, bi-directionally, matching signal impedance and pulse shapes in accordance with the G.703 standard. Suitable for 2-8Mbps E1 (T1), E2 (T2) data streams.