HD-350 Utility Tunnel Fiber Optic Telephone

Introduction:
Suitable for power plants, mining, dams, steel, ore washing plants, coal washing plants...

Main product features:
1. Housing: Cast aluminum alloy, housing thickness 5mm, sturdy and durable, good sealing; surface coated with imported reflective paint, eye-catching color, does not fade for 5-10 years.
2. Handset: Special ABS/PC plastic, integrated structure, good sealing, withstands impact, high temperature, low temperature, twisting, and pulling without cracking or deformation.
3. Cable: Uses Teflon wire, resistant to acid and alkali, high and low temperatures, anti-aging, non-flammable.
4. Waterproof adhesive: Uses imported waterproof adhesive, high viscosity, resistant to high temperature and high pressure, waterproof lifespan over 10 years.
5. Handset microphone, buzzer, and circuit board feature three-level waterproof and dustproof functions, with the entire unit meeting national standard GB4028-93IP66.
6. The telephone has good stability and strong anti-interference capability, complying with national standard GB/T15279-94.
7. Buttons: Silicone buttons, wear-resistant, corrosion-resistant, anti-aging.


II. Operation and Use
1. On/off-hook method: The on/off-hook method is handset-controlled; off-hook connects, on-hook disconnects.
2. Answering calls: When there is an incoming call, the telephone rings; pick up the handset to talk, and hang up the handset after the call.
3. Making calls: Pick up the handset to directly talk to preset numbers.

III. Main Technical Parameters
1. Suitable for various program-controlled exchanges with supply voltage of 24-60V and HDS-1000 dispatch exchange systems.
2. Temperature: -40℃~70℃ Relative humidity: 10%~95% Atmospheric pressure: 86~106Kpa Ambient noise: ≤60dB(A)
3. Ringing sound level: ≥70dB
4. Signal level standard frequency when subscriber line is 3KM: Low-frequency group: 697-941Hz High-frequency group: 1209-1477Hz
Frequency deviation: Not more than ±1.5% Level difference between high and low frequencies of combined signal: 2±1dB
Total distortion caused by harmonic intermodulation is at least 20dB lower than the fundamental level.
5. Call transmission indicators: SLR≤12, RLR≤-1, STMR≥10, Output impedance: 600Ω
6. Features super 12-group number storage memory dialing function (each number up to 16 digits).
7. On 0.8mm cable core, subscriber line can be up to 7KM long.

IV. Lightning Protection Standard
The telephone mainboard is equipped with parallel lightning protection, meeting standards GB/T9043-1999 and ITU-TK.12 (optional).



Electrical parameters are as follows:
1. DC breakdown voltage 400V
2. DC breakdown voltage range 30%
3. Withstand impact current 1KA (8/20μs current wave)
4. Insulation resistance greater than 1G ohm

5. Telephone 13121935296

V. System Installation
Wall-mounted installation of the telephone, as shown in the diagram.

VI. Packaging




Unit dimensions: 320*205*100 (mm)
Outer box dimensions: 439*277*191 (mm)
Packaging materials: Pearl cotton, carton
Gross weight: 5.7KG
Net weight: 3.9KG