Intrinsically Safe Gigabit Ethernet Switch

The KJJ12 is a next‑generation intrinsically safe broadband communication switch engineered specifically for underground coal mine environments. Fully compliant with the IEEE 802.3 and IEEE 802.3u Ethernet standards, this switch delivers high‑speed data transmission with 10,000 Mbps fast Ethernet capability and supports a fiber‑optic self‑healing ring network architecture that significantly enhances system reliability and redundancy. Its intrinsically safe design makes it suitable for explosive gas atmospheres, ensuring safe co‑existence with other mining communication devices. The switch is equipped with five gigabit optical ports (LC type, 1310nm single‑mode fiber) supporting full‑duplex TCP/IP transmission at 1000/100 Mbps auto‑negotiation, with transmitting power from ‑10dBm to 0dBm and receiving sensitivity of ‑22dBm. These optical ports enable a maximum transmission distance of 10 kilometers over mining single‑mode flame‑retardant fiber cables (MGXTSV type), accommodating up to e…