The ONS 15454 SDH FMEC-DS1/E1 card provides front mount electrical connection for fourteen ITU-compliant, G.703 E-1 ports. With FMEC-DS1/E1, each E1-N-14 port operates at 2.048MBits/s (Mbps) over a 120-ohm balanced cable via two 37-pin DB connectors.You can install the FMEC-DS1/E1 card in any EFCA (Electrical Facility Connector Assy) slot from slot 18 to 22 or slot 25 to 29 on the ONS 15454 SDH. Each FMEC-DS1/E1 card port features E1-level inputs and outputs supporting cable losses of up to 6 dB @ 1024 kHz.