This phone is suitable forExpressways, power plants, oil stations, mines, wharfs, steel companies, tourist attractionsIt can be used in environments with special requirements such as moisture-proof, fire-proof, noise-proof, dust-proof, freeze-proof and destructive-proof. Its technical indicators are in the leading international level. PassedCE、FCC、IP66Protection certification.
I. Product Overview
1. The telephone is made of aluminium alloy, and the pillars are made of 304 stainless steel, which has strong resistance to violence.
2. Adopt three-level waterproofing treatment, protection grade up to IP67, waterproof, moisture-proof, dust-proof function is prominent.
3. Ferrofluorocarbon wire, acid and alkali resistance, fire resistance, anti-aging.
4. Imported waterproof glue, high viscosity, high temperature resistance, high pressure, waterproof life10 yearsAbove
5. Use magnetic induction switch to avoid accidents caused by sparks generated by mechanical switches.
II. Major Technical Requirements
1. Various SPC switches and dispatching switches with feeding voltages of 48-60V and dispatching switches
2. Temperature: - 35 70 Relative Humidity: 10%~95% Atmospheric Pressure: 86~106 Kpa Environmental Noise: <60 dB(A)
3. Ring level: > 70dB, external flash ring
4. When the subscriber line is 3KM, the standard frequency of signal level: low frequency group: 697-941Hz high frequency group: 1209-1477Hz frequency offset: not more than & plusmn; 1.5% combination signal high and low frequency level: 2 & plusmn; 1dB total distortion caused by harmonic intermodulation is at least 20 dB lower than the basic level.
5. Telephone transmission indicators: SLR < 12, RLR < 1, STMR < 10, output impedance: 600_
6. Super-strong memory dialing function for 12 groups of numbers (up to 16 bits per group of numbers)
III. Application
Power supply mode:Telephone line power supply
Connection mode:Two-core or twisted-pair connection
Lightning protection measures:
In areas where thunderstorms are frequent, we connect discharge tubes in series to avoid damage to outdoor telephones by lightning.
The electrical parameters are as follows:
1. DC breakdown voltage 220 & plusmn; 30V
2. Pulse current withstand 5KA (8/20s current wave, 10 times); 100A (10/100s power wave, 300 times);
3. The residual transmission voltage between lines is less than 260V and the pulse width of residual transmission voltage between lines is less than 40ns.
4. Circuit line resistance <18 ohms
