China CoalMine Monitoring

China Underground Coal Mine Monitoring


Over the past several years, mine safety has become a serious issue in China due to the number of mining accidents and explosions that take place on regular bases. To reduce mine disasters, improve mine safety and promote stable coal, gold, platinum or other valuable mineral production, mine distributing companies are introducing advanced monitoring and communications systems for enhancing safe operation underground mines.
The system stability and over the clock operation is a major task to conquer when installing devices underground. Therefore, the solutions should be designed to be able to face the harshest conditions while transferring data without losses. 
To provide highly reliable data communication for its mines, a Chinese Mining Company has come up with the decision to use Korenix JetNet series managed switches in its project. The 4508f-m V2 switches with multi-mode fiber ports have been installed in the underground areas of the open pit mine, where they provided connectivity to the humidity sensors, temperature measuring devices and other equipment using 6 10/100TX copper ports, and connected the switches together via the 2 100Mbps fiber ports. The switches have been chosen with multi-mode fiber ports to allow extending data up to 2KM: hence, coal miners could easily connect the devices installed far from each other, as well as ensure the extended uplink connection from the underground to the control center.

The reliability of the data underground has been achieved using the MSR ring redundancy technology of the switches – the JetNet 4508f-m V2 series with the support of MSR were capable of forming rings together. If any link failed, the network could be recovered instantly, within 5ms, without causing any data loss.
Another important factor for the Coal Mining Company to choose JetNet 4508f-m V2 for the underground installation, has been its robust design: the switches with Level 3 EMC conformance for heavy industry deployments as well as the EN 50121-4 Railway EMC, IEC 61373 vibration/shock approvals are constructed in rugged IP31 enclosures, and have a wide operating temperature range -40~75°C (JetNet 4508-w/4508f-w V2). This means that they could reliably be used under tough conditions without any instability.
The JetNet 5628G series fanless rackmount switches were further used in the control room on the ground to ensure reliable backbone connection with the JetNet 4508f-m V2 switches for collecting the data from underground area. By using the modular design, users could benefit from various copper or fiber connections and get data from a great number of devices installed in a control room. Using SFP combo ports for 100Mbps fiber connection, they collected all the real-time data to send it to the PC through high-speed gigabit combo ports for analyzing the situation under mines.
Besides, as it supports LLDP and Korenix NMS, users could directly get the topology of the network and monitor the devices, change the IPs etc, the group management etc from the control room.
Using Korenix switches the company allowed system integrators to prepare highly reliable data transmission from the underground mine to the control center without any data loss and collision and thus providing safe mine operation.

Main Products
JetNet 4508fm-w V2 Industrial 8-port Managed Fast Ethernet Fiber Switch
JetNet 5628G IEC61850-3 24+4G Modular Managed Ethernet Switch
Why JetNet 4508fm-w V2
Dual Fiber ports for extending data up to 2KM between switches and to the control room
MSR ring redundancy with 5ms recovery time for non-stop data transfer 
Embedded watchdog timer for system automatic rescue  
Level 3 EMC Heavy industry conformance and -40~75oC operating temperature for resisting harsh underground conditions
Why JetNet 5628G
3 Modular Slots with up to 24 Fast Ethernet or 18 100 Fiber Ports for flexible applications with reduced costs
4 Giga SFP combo ports for high speed gigabit copper uplink connection to central PCs 
MSR for reliable and high-performance connectivity 
LLDP and Korenix NMS for auto topology visualization and efficient network management 
Ruggedized design, including ESD and surge protection, anti-vibration/shock and -40 to 85oC wide op. temp. for severe environment applications

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