Special telephone quick selection

This article specializes in engineering and technical personnel and business procurement personnel. It will quickly introduce special types of telephones needed for projects such as railways, tunnels, tube galleries, and high-speed highways, recognize equipment types, and improve decision-making efficiency. The selection of equipment is fast and accurate. It is not necessary to repeat it again and again. Mind map at the bottom of the picture

Fixed wall-mounted special telephones (industrial telephones) can be classified into two major categories, waterproof and explosion-proof.

Waterproof phone

Waterproof phone can choose in the market, there are three common IP65, IP67, IP68 dustproof and waterproof level.

This indicator, in general, is clearly defined in the engineering tender or design draft and is a rigid requirement. Unless otherwise stated by Party A.

Explosion-proof phone

Explosion-proof phone in the market there are two common categories, respectively, corresponding to the I type of coal explosion-proof, II explosion-proof chemical (pipeline gas cabin is II), the two types can not be mixed, there is no difference between high and low, is a parallel choice. Coal explosion must be accompanied by MA coal safety certification, chemical explosion must be accompanied by CNEX-NANYANG national explosion-proof certification (PEPC certification can also be). Can not confirm the type of explosion-proof, can directly inform the manufacturer of the specific application environment.

Classification from the wiring, can be divided into cable, twisted pair, fiber optic cable, respectively, corresponding to analog phones, IP phones, fiber-optic phones.

Analog phone

Standard analog system, direct access to public network, RJ11 telephone port, transmission distance 5-10 kilometers

IP phone

VoIP communication standard, SIP protocol, can not directly access the public network, need to be digital relay, RJ45 network port, transmission distance 100 meters

Fiber Optic Phone

VoIP communication system, SIP protocol, can not directly access the public network, need to be digital relay, SC or LC optical port, transmission distance from 20 km to 120 km optional

Extra features

In the industrial field, there are two kinds of functions: sound amplification and anti-noise

Sound reinforcement phone

It is often classified as a command telephone in industrial production scheduling. The device type is to draw the audio cable from the phone and connect it to the horn speaker.

Anti-noise

Anti-noise can be divided into two types: analog and digital. The type of simulation uses the principle of space anti-phase. From the actual results, it is not particularly effective. Digital anti-noise, generally use DSP microprocessor to filter, and then restore the output. The domestic has basically transitioned to digital anti-noise.

Optical fiber telephone rate and optical module

Fiber-optic phones are generally classified into hundreds of megabytes and gigabits. Optical modules are divided into 1X9 fixed modules and SFP hot-swappable modules.

1X9 fixed module

This kind of module is the optical module that has been invented in Japan since 1999, the most widely used, the most mature technology, and the lowest cost. Generally soldered on the circuit board, once damaged, the whole circuit board needs to be repaired or replaced.

SFP optical module

This type of module is the mainstream development direction in recent years, and it has the advantages of small size, high speed, hot swap, and easy replacement.

The SFP module is of the same size as a U disk, and is inserted into the SFP port of the fiber-optic phone. Once it is damaged, it is replaced directly without the need to repair the telephone circuit board.

About Us - Tri-State Communications

Shaoxing Sanzhou Communication Equipment Co., Ltd. is a professional enterprise producing special protective telephones, three outdoor telephones, industrial and military noise-reducing communication products. It was originally a fixed-point production unit of telephones under the Ministry of Posts and Telecommunications.

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