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Use environment:
1. This product can be widely used in coal mines, gold mines, silver mines, copper mines, iron mines, lead-zinc mines and other underground mines.
2. This product can be used in places with explosion-proof requirements, such as mine tunnels, mine working faces, chemical plants, oil refineries, etc. The explosion-proof grade of this product is the highest explosion-proof grade.
3. This product can operate normally in places with explosion hazard such as gas, coal dust, dust, high-explosive gas, etc.
4. It can operate normally in the ambient temperature range of -40℃～70℃.
5. It can operate normally when the relative humidity of the air is not more than 95% (at 25°C).
6. This product can withstand atmospheric pressure: 70kPa～160kPa.
7. Bearing vibration: acceleration 100m/s; bearing shock: peak acceleration 500m/s.
8. The pollution prevention grade of this product is level 3, and the installation category is Ⅲ.

Power supply
A) Rated input voltage (DC V): 18;
B) Maximum working current (mA): ≤700.
Optical signal parameters
A) Number of optical ports: 2;
B) Transmission mode: TCP/IP full duplex;
C) Transmission rate: 100Mbps;
D) Transmitting power (dBm): -15～0; (light wavelength is 1310nm);
E) Receiving sensitivity (dBm): ≤-30; (light wavelength is 1310nm).

Wireless transmission parameters
A) Communication protocol: WCDMA;
B) Modulation method: QPSK;
C) Working frequency: receiving: 1920MHz～1980MHz; transmitting: 2110MHz～2170MHz;
D) Transmitting power (dBm): -15～-35 (behind the antenna);
E) Receiving sensitivity (dBm): ≤-80;
F) Maximum wireless communication distance between base station and mobile phone: 200m.