Detailed introduction of optical transceiver interface classification

There are many types of optical transceivers, such as video optical transceivers, digital optical transceivers, HD-SDI optical transceivers, HDMI optical transceivers, VGA optical transceivers, and DVI optical transceivers. These are the hottest in the industry.

Typical physical interface of optical transceiver:

1, BNC interface

The BNC interface in the optical transceiver refers to the coaxial cable interface, and the BNC interface is used for the 75-ohm coaxial cable connection, and provides two channels of receiving (RX) and transmitting (TX), which are used for connecting unbalanced signals.

2, fiber optic interface

The fiber interface in the optical transceiver is the physical interface used to connect the fiber cable. There are usually several types, which are developed by NTT Corporation of Japan. FC is the abbreviation of FerruleConnector, and the external reinforcement method is a metal sleeve, and the fastening method is a turnbuckle. The ST interface is usually used for 10Base-F, and the SC interface is usually used for 100Base-FX.

3, RJ-45 interface

The RJ-45 interface in optical transceivers is the most commonly used interface for Ethernet. RJ-45 is a common name, which is standardized by IEC (60) 603-7, using eight locations defined by international connector standards ( 8-pin) modular jack or plug.

4, RS-232 interface

The RS-232-C interface (also known as EIARS-232-C) in the optical transceiver is the most commonly used serial communication interface. It was developed in 1970 by the Electronic Industries Association (EIA) in conjunction with Bell Systems, modem manufacturers, and computer terminal manufacturers for serial communication standards. Its full name is "the serial binary data exchange interface technology standard between data terminal equipment (DTE) and data communication equipment (DCE)". The standard specifies a 25-pin DB25 connector that specifies the signal content of each pin of the connector and also specifies the level of each signal. (currently using DB9)

5, RJ-11 interface

The RJ-11 interface in the optical transceiver is what we usually call the telephone line interface. RJ-11 is the generic name for connectors developed by Western Electric. Its shape is defined as a 6-pin connector. Formerly known as WExW, where x means "active", contact or wire. For example, WE6W has all 6 contacts, numbered 1 to 6, and the WE4W interface uses only 4 pins. The outermost two contacts (1 and 6) are not used. WE2W uses only the middle two pins (ie, the telephone line interface).

HD optical transceiver video interface:

VGA interface:

VGA (VideoGraphicsArray) also has a name called D-Sub. The VGA interface has a total of 15 pins, divided into 3 rows, 5 holes per row, which is the most widely used interface type on the graphics card. Most graphics cards have such interfaces. It transmits red, green, and blue analog signals as well as synchronization signals (horizontal and vertical signals). Use a VGA connection device, the cable length should not exceed 10 meters, and pay attention to whether the connector is installed firmly, otherwise it may cause ghosting in the image.

DVI interface:

DVI (DigitalVisualInterface) interface and VGA are the most commonly used interfaces in computers. Unlike VGA, DVI can transmit digital signals without having to go through digital-to-analog conversion, so the picture quality is very high. Currently, DVI interfaces are also available on many HDTVs. It should be noted that there are various specifications for the DVI interface, and DVI-D (Digital) and DVI-I (Intergrated) are common. DVI-D can only transmit digital signals, which you can use to connect graphics cards to flat-panel TVs. DVI-I can be converted to and from VGA in DVI-D.

HDMI interface:

The HDMI (HighDefinition Multimedia Interface) interface is a recently introduced interface that transmits all digital signals like DVI. The difference is that the HDMI interface can not only transmit high-definition digital video signals, but also transmit high-quality audio signals at the same time. At the same time, the function is the same as the RF interface, but due to the use of fully digital signal transmission, there will be no image quality deterioration like the RF interface.