Transmission Distance Of Optical Terminals

- Jul 29, 2019-

Transmission distance refers to the maximum distance that an optical terminal can actually transmit optical signals. This is a nominal value, which depends on equipment and actual environment and other factors. Dual-fiber optical terminals can generally transmit 1 to 120 KM, single-fiber can generally transmit 1 to 80 KM.

Optical terminals now appear, the purpose of which is to transmit telephone voice through optical fibers. The equipment can transmit 1-720 lines of telephone through a pair of optical cables. It is the best choice for long-distance transmission of telephone, shielding computer room, telephone supermarket and district number.

Optical terminal

Optical terminal interface type

The typical physical interfaces of optical terminals are as follows:

BNC interface

BNC interface refers to coaxial cable interface. BNC interface is used for 75 Euro coaxial cable connection. It provides two channels: RX and TX. It is used for unbalanced signal connection.

Optical Fiber Interface

Fiber optic interface is a physical interface used to connect fibre optic cables. Usually there are SC, ST, FC and other types, which are developed by NTT Company of Japan. FC is the abbreviation of Ferrule Connector. Its external reinforcement is metal sleeve and screw fastening. ST interface is usually used for 10Base-F, SC interface is usually used for 100Base-FX.

RJ-45 interface

RJ-45 interface is the most commonly used interface in ethernet. RJ-45 is a common name. It refers to a modular socket or plug that is standardized by IEC (60) 603-7 and uses eight locations (eight pins) defined by the international plug-in standard.

RS-232 interface

RS-232-C interface is the most commonly used serial communication interface at present. It is a standard for serial communication developed in 1970 by the EIA in conjunction with Bell Systems, modem manufacturers and computer terminal manufacturers. Its full name is "Technical Standard for Serial Binary Data Exchange Interface between Data Terminal Equipment (DTE) and Data Communication Equipment (DCE)". The standard stipulates the use of a 25-foot DB25 connector, regulates the signal content of each pin of the connector, and regulates the level of various signals. (Currently, DB9 is used more often)

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RJ-11 interface

RJ-11 interface is what we usually call telephone line interface. RJ-11 is a generic name for plug-ins developed by Western Electronics Company. Its shape is defined as a 6-pin connector. Originally known as WExW, x here means "activity", contact or needle.

Working principle

Optical terminal is an optical fiber communication equipment to extend data transmission. It mainly uses the technology of signal modulation and photoelectric conversion to achieve the purpose of long-distance transmission by utilizing the characteristics of optical transmission. Optical terminals are generally used in pairs, which are divided into optical transmitters and optical receivers. Optical transmitters complete the electro-optical conversion and send out the optical signals for optical fiber transmission. Optical receivers mainly restore the optical signals received from optical fibers to electrical signals to complete the optical/electrical conversion. The function of optical terminal is to transmit data remotely.


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