... in cross connection, namely "TX-RX", "RX-TX" (direct butting for single optical fiber).2. ConnectionThe network device (work station, hub ... 1550nm.20kmpairCnr-116Chassis,16 Slots 2.5U 19" w 2 power racks, 2 power. Cn3-S3022CDDouble chs media converters,10/100/1000M ... optional,2*RJ45 +2* fiber port,19" 1U rack mountiong,Redundant DC48/AC220V power supply.20kmpair 10/100/1000M Media Converter Cn1