A Comparison Helps You Better Choose 10GBASE-SR SFP or 10GBASE-LR SFP?

With the increasing demand for a smaller form factor and high density to meet the speed and standard of 10 Gigabit Ethernet, the 10G small form-factor pluggable (10G SFP) fiber optic transceiver just emerges as the times require around 2009. With a more compact form factor, high density and low cost, the series of 10G SFP became the mainstream on the market over the other packing forms of optic modules. It is used for both telecommunication and data communication. 10G SFP can be divided into many types according to different classification standard, such as 10GBASE-SR SFP, 10GBASE-LR SFP, 10GBASE-ER SFP...In this text, we will mainly introduce the definition and differences between 10GBASE-SR SFP and 10GBASE-LR SFP.
10GBASE-SR SFP
The letters “SR” stand for “short range”, and thus it intends to transfer over short distance. 10GBASE-SR is the original multimode optics specification, and is still by far the most commonly used. As it uses a single, low cost solid state laser assembly operating at 850nm, it is also the least expensive of the optical modules available for a 10G platform. However, 10GBASE-SR is very sensitive to fiber type and very limited by short distance. Because of the distance limits, it is highly recommended that any new multimode fiber deployments use OM3 or higher grade fiber to ensure any 10G deployments do not run into any issues with distance.
10GBASE-LR SFP
Being quite opposite with “SR”, the letters “LR” stand for “long range”, so it designs for data transmission over long distance. 10GBASE-LR can reach 10 km over single-mode fiber. There is no minimum distance for LR, so it is suitable for short connections over single-mode fiber as well.
Differences Between 10GBASE-SR and 10GBASE-LR
Based on the above statement, we analyzed and concluded that the main differences between 10GBASE-SR and 10GBASE-LR lie in the type of fiber mode, transmission distance, wavelength and optical power.
  • Type of fiber mode—10GBASE-SR SFP designed for short range, so the media type of it is multimode fiber. It can be connected with a serial multimode fiber such as OM3 and OM4. 10GBASE-LR SFP sets for long distance transmission, and thus single-mode fiber is mainly covered in 10GBASE-LR SFP.
  • Transmission distance—By using a multimode fiber, the maximum transmission distance of 10GBASE-SR SFP is 400 m (OM4). The transfer distance of 10GBASE-LR SFP can be up to 10 km with a single-mode fiber. Apparently, 10GBASE-LR SFP is far beyond the 10GBASE-SR SFP on transmission distance.
  • Wavelength—10GBASE-SR SFP uses short wavelength to transfer signals, the wavelength of it is 850 nm with a TX range between 840 nm-860 nm and RX range between 840 nm-860 nm. LR uses long wavelength to transfer data, its wavelength is 1310 nm with a TX range between 1260 nm-1355 nm and RX range between 1260 nm-1600 nm.
  • Optical power—The optical power of 10GBASE-LR SFP is slightly higher than 10GBASE-SR SFP, the gap between them is around 1.5 dBM. The link budget of SR is 2.6 dB (OM3) while the LR is 6.2 dB. Clearly, 10GBASE-LR SFP uses more power than 10GBASE-SR SFP.
Summary
If you are looking for an optical module to transmit within short distance, 10GBASE-SR SFP would be great choice with low cost and low power. When the distance is much longer, it is highly recommended to use 10GBASE-LR SFP to ensure signals are transferred all the way through. The cost may high, but quality is reserved.

Comments

Post a Comment

Popular posts from this blog

Cisco GLC-LH-SM Vs. GlC-LH-SMD

Image
In recent decades, Cisco 1000BASE SFP transceivers have been widely used by many Ethernet users. There are many types of 1000BASE-LX/LH SFP transceivers on the market, such as Cisco GLC-LG-SM, GLC-LG-SM-RGD, GLC-LG-SM-20, which are operating on standard single-mode fiber-optic link spans of up to 10 km and up to 500 m on any multimode fibers. Among them, Cisco GLC-LG-SM and GLC-LG-SMD are two types of Cisco 1G SFP transceivers which are warmly welcomed by lots of Ethernet users. Do you know about them? And how to select? The detailed information about Cisco GLC-LG-SM and GLC-LG-SMD would be provided in the following passage. Overview on Cisco GLC-LH-SM The Cisco GLC-LH-SM 1000BASE-LX/LH Ethernet transceiver is a Duplex SFP transceiver for optical communications. It is fully compliant to Multi-Source Agreement (MSA), allowing it to function with other third party MSA compliant networking equipment. This 1000BASE SFP optical transceiver is capable of transmitting data at speeds of u...
Read more

SFP LC SX Vs. LX Transceiver

Image
1000BASE SFP transceivers have been widely used in 1G/10G/40G Ethernet, telecommunication and other applications. They provide a full range of 1000BASE SFP transceivers types to meet the different requirement for varied transmission distance based on singlemode or multimode fiber. They can be interfaced with different connectors, such as LC, SC, ST, FC, etc. 1000BASE-SX SFP and 1000BASE-LX SFP transceivers are two different types of 1000BASE SFP LC transceivers. In this article, SFP LC transceiver, SFP LC Vs. SC, and SFP LC SX Vs. LX transceiver would be covered. What’s SFP LC transceiver? SFP LC transceiver means 1000BASE SFP transceiver with LC connectors, which includes 1000BASE-SX SFP, 1000BASE-MX SFP, 1000BASE-LX SFP, 1000BASE-EX SFP, 1000BASE-ZX SFP, 1000BASE-EZX SFP, 1000BASE-BX SFP and CWDM/DWDM SFP transceiver modules. Different protocols have varied requirement for transmission medium, operation temperature, supporting DOM or not, and etc. 1000BASE-SX SFP i...
Read more

How Much Do You Know About 100G CFP Series Optical Modules?

Image
In contemporary world, the Internet users have experienced the great changes brought by 10 Gigabit Ethernet and 40 Gigabit Ethernet. For most Ethernet users, 10/40GbE is more than sufficient, however, not enough for the increasingly growing enterprise networks. In order to enhance the efficiency of Gigabit Ethernet network, developers in data center researched and found out a solution—100 Gigabit Ethernet. 100 Gigabit Ethernet (100GbE) is groups of computer networking technologies for transmitting Ethernet frames at rates of 100 gigabits per second (100 Gbit/s), which conforms with 802.3bm-2015 standards. 100G Ethernet significantly improved efficiency on all aspects, such as bandwidth, space, power...There are many form factors of 100G transceivers including CXP, CFP, CFP2, CPAK, CFP4 and QSFP28. In this passage, we are going to mainly talk about CFP, CFP2, CFP4 and CXP. CFP Module CFP is short for C form-factor pluggable, and the first letter-C stands for the Latin letter C used...
Read more