10G SR vs 10 LR vs 10G LRM, Similarities and Differences – QSFPTEK

10G SR vs 10 LR vs 10G LRM, Similarities and Differences

With the popularization of 10 Gigabit Ethernet, 10G SFP+ fiber optic transceivers have exploded in popularity, especially 10GBASE-SR and 10GBASE-LR, which are the two of the most popular transceiver model. Except for 10G SR and 10G LR, there are also some derivative products including SFP-10G-SR-S, SFP-10G-LR-S, and SFP-10G-LRM. If you are confused about them, this article will help you distinguish them all. 

What are SFP-10G-SR and SFP-10G-SR-S?

SFP-10G-SR

SFP-10G-SR, also known as 10GBASE-SR, is designed for 10 Gigabit short-range distance fiber optic transmission, which is the highest-selling 10G SFP+ optics. 10GBASE-SR allows a short distance link of 300 meters over OM3 multimode fiber (MMF) and 400 meters over OM4 multimode fiber. The centra wavelength of 10GBASE SR SFP+ module is 850nm.

SFP-10G-SR Datasheet

Speed 10.3125 Gbps
Distance 300m(OM3), 400m(OM4)
Connector Type LC Duplex
Weight 20 g (0.7 oz)
Fiber Cable Type MMF
Wavelength 850nm
Temperature COM (0 to 70°C) EXT (-5 to 85°C) IND (-40 to 85°C)
FCoE Support Yes
OTN Support Yes
WAN-PHY Support Yes

SFP-10G-SR-S

SFP-10G-SR-S is a derivative model of SFP-10G-SR, which can be considered an enterprise-class version of 10GBASE-SR. It was first introduced by Cisco and  classified as Cisco S-class optics. So here comes the question: What the differences are between SFP-10G-SR-S and SFP-10G-SR, and how to choose between them. The following will tell.

SFP-10G-SR-S Datasheet

Speed 10.3125 Gbps
Distance 300m(OM3), 400m(OM4)
Connector Type LC Duplex
Weight 20 g (0.7 oz)
Fiber Cable Type MMF
Wavelength 850nm
Temperature COM (0 to 70°C)
FCoE Support No
OTN Support No
WAN-PHY Support No

SFP-10G-SR-S vs SFP-10G-SR

Similarities 

From the physical appearance aspect, SFP-10G-SR-S and SFP-10G-SR look exactly the same. They have common in dimensions and form factors, both of them feature the SFP+ form factor. From the specification aspect, they are also almost the same, both of them allow transmission distances up to 300m over OM3(400m over OM4). 

Differences

The major differences between SFP-1OG-SR-S and SFP-10G-SR are working temperature and cost. SFP-10G-SR-S S-class only allows a commercial temperature range from 0 to 70°C (32 to 158°F), whereas SFP-10G-SR supports an extended temperature range from -5 to 85°C (23 to 185°F), and an industrial temperature range from -40 to 85°C (-40 to 185°F).

Since the SFP-10G-SR support a wider operation temperature range than SFP-1OG-SR-S, SFP-10G-SR costs more than SFP-1OG-SR-S. And SFP-1OG-SR-S is more popular in enterprise networks and campus networks because these application scenarios have much less strict requirements in the operating temperature and also save a lot.

The other differences are that SFP-10G-SR-S doesn’t support FCoE(Fiber Channel over Ethernet), OTN (optical transport network), and WAN-PHY. Moreover, SFP-10G-SR is under TAA compliance while SFP-10G-SR-S is not.

How to Choose Between SFP-10G-SR-S and SFP-10G-SR

If you're hesitating about buying SFP-10G-SR-S or SFP-10G-SR, the following buy guide can help you. The following lists the features and functions that only SFP-10G-SR supports. If you have any requirements for these, you should choose SFP-10G-SR-S, otherwise, SFP-10G-SR-S is also a good and cost-saving choice.

  • Support FCoE, OTN, or WAN-PHY.
  • TAA compliance.
  • Strict operating temperature requirement. EXT (-5 to 85°) or IND (-40 to 85°C).
  • Optics deployed in non-temperature controlled environments, such as rugged/ industrial (RGD).

What are 10G LR, LRM and LR-S?

10GBASE-LR

10G LR (long reach) is designed for long-distance optical transmission, which is much longer than SR optics distance. It supports 10km over OS2 single-mode fiber (SMF). The centra wavelength of 10GBASE LR is 1310nm.

SFP-10G-LR Datasheet

Speed 10.3125 Gbps
Distance 10km
Connector Type LC Duplex
Weight 20 g (0.7 oz)
Fiber Cable Type SMF
Wavelength 1310nm
Temperature COM (0 to 70°C) EXT (-5 to 85°C) IND (-40 to 85°C)
FCoE Support Yes
OTN Support Yes
WAN-PHY Support Yes

10GBASE-LRM

10G LRM can work on both single-mode fiber and multimode fiber, which supports link lengths up to 220m over OM1, and also supports 300 meters over OS1/OS2. Since the most previously 1000M short-range applications used OM1 multimode fiber optic cables, 10G LRM module  becomes an ideal solution for networking upgrading from 1G to 10G. It should be noticed that a mode conditioning patch cord is required for OM1/OM2 multimode fiber to reach a 220m distance.

SFP-10G-LRM Datasheet

Speed 10.3125 Gbps
Distance 220m(OM1/OM2/OM3/OM4) 300m(OS1/OS2)
Connector Type LC Duplex
Weight 20 g (0.7 oz)
Fiber Cable Type MMF/SMF
Wavelength 1310nm
Temperature COM (0 to 70°C) EXT (-5 to 85°C) IND (-40 to 85°C)
FCoE Support Yes
OTN Support Yes
WAN-PHY Support Yes

SFP-10G-LR-S

SFP-10G-LR-S is also a derivative model of SFP-10G-LR and belongs to the Cisco S-class family. Similar to SFP-10G-SR-S, SFP-10G-LR-S also supports commercial temperature range only, which is suitable for those applications that require no strict limitations to operating temperature.

SFP-10G-LR-S Datasheet

Speed 10.3125 Gbps
Distance 10km
Connector Type LC Duplex
Weight 20 g (0.7 oz)
Fiber Cable Type SMF
Wavelength 1310nm
Temperature COM (0 to 70°C)
FCoE Support No
OTN Support No
WAN-PHY Support No

Conclusion: 10G SR vs LR vs LRM vs SR-S vs LR-S

The major similarities and differences of 10GBASE SR, LR, LRM, SFP-10G-SR-S and SFP-10G-LR-S SFP+ transceivers can be concluded as follows.

Part Number  SFP-10G-SR SFP-10G-SR-S SFP-10G-LR SFP-10G-LR-S SFP-10G-LRM
Wavelength 850nm 850nm 1310nm 1310nm 1310nm
Distance 300m(OM3)400m(OM4) 300m(OM3)400m(OM4) 10km 10km 220m(MMF) 300m(SMF)
Fiber Cable MMF MMF SMF SMF MMF/SMF
Temperature COM EXT IND COM COM EXT IND COM COM EXT IND
FCoE Support Yes No Yes No Yes
OTN Support Yes No Yes No Yes
WAN-PHY Support Yes No Yes No Yes

QSFPTEK focuses on providing SMB customers with cost-effective and high-performance 3rd-party optical transceivers. We can provide a comprehensive portfolio of fiber optic transceivers from 10G to 400G with cost-effectiveness. Each transceiver will be tested before delivery to ensure performance and 100% compatibility. Welcome to consult via sales@qsfptek.com.

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