Difference between sr and lr sfp

 
What’s the Difference between SFP-10G-SR and SFP-10G-LR? If you’re looking for a 10GBaseSR or 10GBaseLR, then this post SFP sr vs LR is for you. These two types of modules are designed to work with different distances and speeds. The SR module supports lengths up to 100m, whereas LR can support up to 10km. Sfp 10g lr vs sfp 10g sr, what do these acronyms stand for? A 10GBase (or gigabit) LAN (local area network) uses baseband technology to transfer data over copper cables at speeds of 1 Gb/s per second. Sfp sr vs lr, theses type of connection is usually used in businesses with high bandwidth requirements, such as large offices, hospitals, universities, and airports. Larger offices, like universities and hospitals, often require higher bandwidth than what baseband (100Mb/s) offers, and this is where fiber-optic cables come in. Sfp-10g-LR vs sfp-10g-sr, with fiber optics, the information transmitted does not have to be converted into electrical signals since it already travels as light through an optical cable, resulting in data transfer speeds of up to 100 Gbit/sec. AS for sfp sr vs lr, the LR SFP+ transceiver uses single-mode fibers, while SR uses multimode fibers to choose the appropriate transceiver for your application.
 
SR (Short Range) and LR (Long Range) are common designations for transceiver modules, including SFPs (Small Form-factor Pluggable). These identifiers refer to the reach, or transmission distance, of the modules.

SR SFP (Short Range):

 These are typically designed for short range transmission over multi-mode fiber optic cable. They often use 850nm wavelength and can transmit data up to 300 meters depending on the exact standard and type of fiber used. SR SFPs are commonly used within the same building or campus.
SFP-10G-SR(Short Range) is a very common sfp module, which can links up to 300 meters in multimode fiber. In general, SR modules are almost multimode and operating in 850nm wavelength. These modules are hot-plugged can be switched out easily.
 

LR SFP (Long Range):

 These are designed for long range transmission over single-mode fiber optic cable. They usually operate at 1310nm wavelength, and can transmit data up to 10 kilometers. LR SFPs are more expensive than SR SFPs due to the laser technology needed to transmit data over longer distances. They are commonly used for linking geographically separated sites.
SFP-10G-LR(Long Range)is used for long-range data transmission, such as large compuses or Metro Area Network. It can be either single mode or multimode and has the advantages of low cost, low power consumption, small size and high density.
What are the SFP-10G-SR and SFP-10G-LR?
In simple terms, the SFP-10G-SR/LR is a very common type of optical module. Cisco, Huawei and other large manufacturers have this kind of production, mainly used in switches and routers, we can analyze it from the three aspects.
SFP (Small Form-factor Pluggable) refers to a small module that can be hot-pluggable. It can be regarded as an upgraded version of GBIC. It only sizes as the thumb and can greatly increase the port density. The SFP complies with the IEEE802.3, SFF-8472 protocol and can use digital diagnostics through I2C.
10G stands for its maximum transmission rate of 10.3 Gbps. It is suitable for 10 Gigabit Ethernet. 10G optical networks have become popular in telecommunication networks. 10G switches are also being used by more and more people.
SR and LR represent the transmission distance of the optical module. SR, LR, LRM, ER and ZR are more common in the 10G IEEE standard. The transmission distance they represent is from short to long. You can check it by the following table.

10G IEEE standard	Transmission Distance
10GBASE-SR	300m or 400m
10GBASE-LR	10km
10GBASE-LRM	200m
10GBASE-ER	40km
10GBASE-ZR	80km

Comparison of appearance

Let us first look at the appearance of the SFP-10G-LR-S optical module and the SFP-10G-SR-S optical module. They are packaged in the form of SFP+ and can be plugged into the SFP+ port of the switch and are also hot-pluggable. The overall size is also the same. Because of different manufacturers, there are differences in the label position and interface design of the two optical modules, but the components are the same and there is no difference between them.

Name	SFP-10G-SR	SFP-10G-LR
Package type	SFP+	SFP+
Rate	10 Gbps	10 Gbps
Wavelength	850nm	1310nm
Distance（max）	300m	10km
Interface	LC duplex	LC duplex
Laser type	VCSEL 850nm	DFB 1310nm
Fiber optic type	MMF	SMF
DOM	YES	YES
Transmitted light power	-6～-1dBm	-8.2～0.5dBm
Received sensibility	< -11.1dBm	< -14.4dBm
Commercial temperature	0～ 70°C (32 ～ 158°F)	0～ 70°C (32 ～ 158°F)
Features	Maximum transmission rate 10.3Gbps 850 nm VCESL Laser Typical transmission distance 300 meters (OM3 multimode fiber) 3.3V single voltage, TTL logic interface Dual LC interface, hot-pluggable	Maximum transmission rate 10.3Gbps 1310 nm DFB-LD Laser Typical transmission distance 10 kilometers 3.3V single voltage, TTL logic interface Dual LC interface, hot-pluggable
Application range	Only used for short distance connections	Only used for long distance connections

 

1、 The Same Points

The SFP-10G-LR-S optical module and the SFP-10G-SR-S optical module both have a rate of 10.3125 Gbps. Both of them can be applied to 10 Gigabit Ethernet, SDH and SONET networks, and their interface types are LC Duplex.
Both the SFP-10G-LR-S and SFP-10G-SR-S optical modules support the DOM function, which is digital diagnostics. It helps network administrators monitor and report the operating status of the optical module in real time, including the temperature of the optical module. , laser bias current, etc.
 

2、The Different Points

The wavelength of the SFP-10G-LR-S optical module is 1310nm, and the transmission distance can reach 10km when it is used with a single-mode optical fiber. And the wavelength of an SFP-10G-SR-S optical module is 850nm when it is used with an OM3 multi-mode optical fiber. The transmission distance up to 300m. Therefore, SFP-10G-LR-S optical module is mainly used for long-distance transmission, and the SFP-10G-SR-S optical module is only used for short-distance transmission. But they do not support FCoE link, it is recommended that everyone in accordance with the actual needs of the transmission distance could choose the right light module.
The laser type of SFP-10G-LR-S optical module is DFB 1310nm, whose transmitted optical power is -8.2 ~ 0.5dBm and the receiving sensitivity is <-14.4dBm. The laser type of SFP-10G-SR-S optical module is VCSEL 850nm whose transmitted optical power is -6 to -1dBm, and the receiving sensitivity is <-11.1dBm. The lasers of these two optical modules are different. The application range of DFB lasers is wider than that of VCSEL lasers. At present, the most commonly used lasers in the field of optical communications are FP lasers and DFB lasers. However, VCSEL lasers have not been widely used due to the disadvantages of complicated manufacturing processes and insufficient output power.

There are many manufacturers of SFP-10G-SR/LR, of which the representative is Cisco, and Cisco's switches also occupy a relatively large market share. But in the actual selection process, in addition to the IEEE standard and transmission distance, we also need to consider some other factors, such as compatibility and cost.
There are many Cisco SFP-10G-SR/LR optical modules manufactured by third-party manufacturers on the market, but they are not all compatible and may not be used in the SFP connector of the switch. When purchasing optical modules, It must be guaranteed that it is compatible with the switch.
The second factor is the cost problem. Many users will choose the original optical module. Of course, it is best if the funds are sufficient. The SFP-10G-SR/LR optical module offered by SOPTO has become a more and more popular choice due to its high cost-efficiency and good quality.
The above is simply to answer the question of what the next SFP-10G-SR/LR is. If you want to learn more about optical communications, welcome to Sopto Technology.
 
 
 
In summary, the main differences between SR and LR SFP are their transmission distances and the types of fiber cable they work with. SR SFP is intended for short range over multi-mode fiber, while LR SFP is for long range over single-mode fiber. Please note that these ranges are general and can vary based on the exact specifications of the modules.
 
From all the above, it is not difficult to understand the difference of SFP-10G-SR vs SFP-10G-LRM vs SFP-10G-LR. Normally, SFP-10G-SR modules are more recommended than SFP-10G-LRM for short-reach 10G application within 300 meters. However, it depends. When users have special requirements that only LRM over MMF could support, SFP-10G-LRM is a necessity. And if the transmission is more than 300 m and less than 2 km, SFP-10G-LRM2 is a better choice. For the network that requires a link length of 2-10 km, SFP-10G-LR modules are better suited.
 
 
 

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What does -X signify, as in SFP-10G-LR-X or SFP-10G-SR-X?

Whenever you see -X, that means it has extended ability to operate under wider temperature variation, from -40°C to 85°C (-40°F to 365°F). There is no other significant difference from the standard versions, and no reason to use -X equipment unless you're operating in extreme temperatures.
By comparison, standard transceivers are generally restricted to operating temperatures from about 0°C to 70°C (32°F to 158°F).