Transition Networks SSDTF Standalone T1/E1 TP-to-Fiber Remotely Managed Network Interface Device SSDTF1011-120.Model Number: SSDTFTransition Part Number: SSDTF1011-120Specifications:• Twisted Pair (RJ-48) [1.5 km/0.9 mi.] to 850nm multimode (ST)[2 km/1.2 mi.]• Link Budget: 13.5 dB