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| Mine-used Wire/Wireless Communication |
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Based upon CDMA technology, Model KT28 Mine-used CDMA Wireless Communication System is specially developed for meeting requirements of underground working environment and safety production. The system is consisted of surface part (including server, operation and maintenance subsystem, wireless exchanger, basestation controller, basestation, power divider, power combiner, local optical module), underground coverage network (including junction box for optical cable, optic combiner/divider, KZG1 mine-used wireless signal converter, KTW116 wireless coupler, KTW115 wireless power divider, leakage cable, omnidirectional antenna, directional antenna), and terminal devices (including data terminal, video terminal, KTW25 mobile phone, KTW25A mobile phone). The system has been awarded the first prize of Scientific Technology by Coal Industry Association, and the third prize of Science and Technology Progress by China Coal Research Institute. |
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The system can realize mobile communication for moving workers in mine wide including surface (part or whole mine area) and underground. |
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The system can realize wireless transmission of monitored data and image at mobile points or temporary fixed points. |
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The system can provide multiple functions including voice communication, SMS, GPRS, fax and trunk dispatching. |
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Based on IP structure, the system can realize seamless connection with cable network, fully utilizing the existing network and providing continuous and complete service. |
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The system has large capacity, can support more than 35 mobile phone users communicating at the same time with 1 carrier and 1 sector (basic configuration: 1 carrier and 3 sectors). |
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The system has multiple wireless cover modes (directional antenna, omnidirectional antenna, leakage cable), meeting the complicated requirements in mine underground, realizing seamless coverage of wireless signal in mine wide. |
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The far-end module is mine-used I.S. product and can realize wireless communication in methane area of excavating and heading face underground. |
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The system has not only function of voice dispatching, but also functions of data and video transmission. |
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System Capacity
User Capacity: 2 000 mobile phones (512 mobile phones among them are dispatching phones)¡¡
Trunk Capacity: 16 E1 trunk interfaces/32 loop trunks¡¡
System Coverage: surface cover radius 2 km, underground cover distance 85 km |
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Transmission Distance
Transmission Distance by optical fiber:  15 km between surface host and mine-used wireless signal converter by MGTJSV single-mode anti-flaming optical fiber
Wireless coverage of mine-used signal converter: 800 m for wireless communication of mobile phone |
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Wireless Parameters
Radio Frequency: upstream 462.5  467.5 MHz, downstream 452.5 457.5 MHz
Carrier Width: 1.25 MHz
Duplex Mode: FDD
Chip Rate: 1.2288 Mchip/s
Max. User Capacity (Voice): 35, 1 carrier and 1 sector (standard: 1 carrier and 3 sectors)
Voice Code: ADPCM 32 kbit/s
Radio Frequency Power: Mobile phone 250 mW, KZG1 converter 1 W |
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