The ONS 15454 SDH FMEC-T54-E1 card provides front mount electrical connection for twelve ITU-compliant, G.703 E-3 or DS-3 ports. With FMEC-E3/DS3, each interface of an E3-12 card operates at 34.368 MBits/s (Mbps), and each interface of a DS3I-N-12 card operates at 44.736 MBits/s (Mbps) over a 75 ohms unbalanced 1.0/2.3 miniature coax connector.