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The answers to the communication questions about 10 Gigabit optical modules and Gigabit optical modules that you want to know are here

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Optical modules are the core components of optical communication links. Currently, the most widely used optical modules on the market are 10 Gigabit optical modules and Gigabit optical modules.


10G optical module refers to an optical module with a transmission rate of 10Gbps, also known as 10G optical module. It can achieve high-speed, stable and reliable data transmission. There are two commonly used packages, SFP+ and XFP, of which SFP+ is the most common. 10G optical modules are mainly used in servers, network equipment and other fields. According to their types, 10G optical modules can be divided into many types.

 

1. According to the different interfaces, it is mainly divided into 10G electrical port optical module and 10G optical port optical module. The 10G electrical port module transmits through cables, and the 10G optical port module transmits through optical fiber. Strictly speaking, the electrical module is not an optical module because it does not have photoelectric conversion function.


2. According to the optical transmission form, it can be divided into: dual-fiber bidirectional optical module (MSA), single-fiber bidirectional optical module (BiDi). The 10G single-fiber optical module achieves bidirectional transmission through fiber core multiplexing technology, effectively reducing the number of optical fibers used and saving costs.


3. According to the mode, it can be divided into single mode fiber module and multi-mode optical modules. 10G multi-mode optical module is suitable for short-distance communication, with a communication distance of 300 meters.


This optical module uses multi-mode optical fiber for transmission and has a large bandwidth. 10 Gigabit single-mode optical modules are suitable for long-distance communications, and common communication distances can reach more than ten kilometers or even dozens of kilometers. This optical module uses single-mode optical fiber for transmission, which has smaller loss and higher transmission distance. It should be noted that optical modules require peer use. The rate, transmission distance, transmission mode, and working wavelength of the transmitter and receiver optical modules must be consistent.


Gigabit optical modules, like 10G optical transceiver modules, are also photoelectric conversion equipment, used to convert electrical signals into optical signals to achieve data transmission in optical fiber networks.


Regarding 10 Gigabit optical modules and Gigabit optical modules, the editor has collected some common questions from netizens and answered them.

 

1. How to distinguish between Gigabit optical modules and 10 Gigabit optical modules?

The biggest difference between Gigabit optical modules and 10 Gigabit optical modules is the speed. The transmission rate of Gigabit optical module is 1Gbps, and the transmission rate of 10G optical module is 10G. In appearance, Gigabit optical modules and 10 Gigabit optical modules are roughly the same size, but the shell materials are different. 10G optical modules are heavier than Gigabit optical modules and have better anti-interference performance. Another relatively niche way to distinguish is to look at the shape of the optical module label. Gigabit optical modules usually use pointed labels, and 10G optical modules usually use rectangular labels. Of course, the most accurate and intuitive way is to read the description on the label or check the module DDM information on the switch.


2. Can a Gigabit optical module be inserted into the 10 Gigabit port? Can a 10G optical module be inserted into a Gigabit port?

There are differences in port protocols between Gigabit and 10 Gigabit ports. Pure 10G ports and pure Gigabit ports cannot be interconnected. However, in fact, major and small switch manufacturers generally make the ports internally compatible in order to have a smooth transition with previous-generation networks. 10 Gigabit and Gigabit are not transitioned all at once. There are two standards in between, 2.5G Ethernet port and 5G Ethernet. There are a total of 4 port protocols. When designing a switch, the switch manufacturer determines which ones are compatible and which ones are incompatible. This is done based on the manufacturer's own product positioning.


For each additional compatible version, there will be hardware and software costs. The more complex the compatibility is, the higher the cost will be. Therefore, there is no standard answer to the question of whether a Gigabit port can be plugged into a 10G optical module and whether a 10G port can be plugged into a Gigabit optical module. Look at the design of the specific equipment. If the port is clearly marked as compatible with Gigabit or 10 Gigabit ports, then both modules can be used.


10G modules are used on Gigabit ports, as long as the device does not specifically control the port. For example, after reading that the module code information is 10 Gigabit specifications, the connection is rejected. Then it is a normal Gigabit port, and there is no problem in shaking hands and communicating with the peer according to the Gigabit network protocol.


The Gigabit module is plugged into a Gigabit/10G compatible device port. When the device reads that the module is Gigabit, it stipulates that this port will only adapt to Gigabit signals from the opposite end. If the request from the peer is a 10G link, it will be rejected or not responded.


The Gigabit module is plugged into a pure 10G or other single function port higher than Gigabit. The device forcibly transmits signals at 10 Gigabit or 5G or 8G rate. The Gigabit module transmits all bit errors, the other end will alarm, and the line is equivalent to being disconnected.


3. Can the 10G optical fiber module be used as Gigabit?

OK. The hardware (main chip/optical device) speed of the optical module itself is backward compatible.


4. Can Gigabit optical modules and 10 Gigabit optical modules communicate?

Gigabit optical modules do not have the ability to send and receive 10G rate signals. Using Gigabit to transmit 10G will result in all bit errors, making it impossible to pass through and cannot be used. The 10G module itself can handle signals at any rate between 1G~10G (or even 12G), and can be transmitted normally within an appropriate distance. Therefore, it is absolutely no problem to use 10 Gigabit as Gigabit to transmit signals. In other words, if you want two modules to communicate, the Gigabit optical module and the 10G optical module, it is possible to reduce the speed of 10G to Gigabit.


On the premise that the signal can be transmitted, the device needs to establish a mutually recognized identity for the two ports according to the network protocol to be considered "communicable". The module reports its own specification category to the switch through its own code, and the switch determines which links the port of the inserted module can or cannot establish in the future based on the category reported by the module.


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