... , and self- negotiation; full/semi duplex, 10M/100M optional)(2) Can provide at most 8 E1 channels transmission transparently, and ... Power supply option: AC220V, DC-48V. The positive and negative terminal can be exchanged for DC-48V, easy for installation and ... 1310nm multi-mode, 1310nm/1550nm single mode. Transmit distance: 2 Km for multi-mode, 40 Km/60Km/120Km for single mode. PDH optical terminal