1. Conforms to all relevant ITU series standards( ITU-T G.703 G.704 G.823) 2. Framing or non-framing mode in option 3. E1 time slot in arbitrary option 4. Balanced 120Ω/non-balanced 75Ω interfaces automatic 5. Support the loop back of local analog/digital interface 6. Support remote loop back function (valid on under framing mode) 7. Support pseudo-random code test function, providing convenience for the test of optic fiber line status 8. 120km trunking -free transmission distance for single-mode optic fiber 9. Capable to be communicated with V.35 fiber modem 10. Available with complete line detection and alarm indications 11. Available with independent structure and 19-inch frame-mounted structure (frame-mounted structure can be inserted with 16 modules); 12. AC 220V and DC –48V inputs may be selected for fiber optic modems of both structures; 13. For frame-mounted fiber optic modems, dual power supply heat backup is provided to ensure a Receiving level:0~-43db
