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SFP-10G-SR-S vs SR vs LR vs LRM vs LR-S, What Are the Differences?

AuthorDerek

Date10/21/2021

10GBASE-SR and LR are two of the most common and popular 10G optics in 10G Ethernet. They also have some derivative products including SFP-10G-SR-S, SFP-10G-LRM, and SFP-10G-LR-S. You may be confused about what their differences are. Which one should you buy? You will find answers in the following article.

What is SFP-10G-SR?

SFP-10G-SR is considered as the hottest SFP+ types module, that is 10GBASE SR SFP module. SR, meaning short reach, indicates the 10GBASE-SR SFP+ transceiver is used for short range applications. 10GBASE-SR supports a relatively short link distance of 300 meters over OM3 multimode fiber (MMF), and up to 400 meters over OM4 multimode fiber at 850nm wavelength. 

 

SFP-10G-SR Datasheet Overview

 

10GBASE-SR Speed

10.3125 Gbps

10GBASE-SR Distance

300m(OM3), 400m(OM4)

10GBASE-SR Connector Type

LC Duplex

Weight

20 g (0.7 oz)

10GBASE-SR Fiber Cable(Single-mode or Multimode)

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

 


What is SFP-10G-SR-S?

SFP-10G-SR-S is a part number of Cisco 10GBASE-SR SFP module enterprise class product. It is also known as Cisco S-class optics. So here comes the question: What are the differences between SFP-10G-SR-S vs SFP-10G-SR? 

 

SFP-10G-SR-S Datasheet Overview

 

SFP-10G-SR-S Speed

10.3125 Gbps

SFP-10G-SR-S Distance

300m(OM3), 400m(OM4)

SFP-10G-SR-S Connector Type

LC Duplex

Weight

20 g (0.7 oz)

SFP-10G-SR-S Fiber Cable(Single-mode or Multimode)

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

Physically, they are exactly the same size and form factor. And from the specification aspect,  there is almost no difference between them, both of them support distances up to 300m over OM3, and 400m over OM4. The main differences between SFP-1OG-SR-S and SFP-10G-SR are application environment limitation and price.

 

The main purpose of Cisco introducing SFP-10G-SR-S is to save costs for enterprise applications. It is suggested to be used in campus and data centers, since S-class optics only allow a limited operating temperature at commercial temperature range (COM, 0 to 70°C) and campus and data centers generally have no special requirements for temperature. However, as for SFP-10G-SR, it can provide wider temperature ranges at extended temperature range (EXT,  -5 to 85°C) and industrial temperature range (IND, -40 to 85°C). Moreover, SFP-10G-SR-S doesn’t support FCoE(Fiber Channel over Ethernet), OTN (optical transport network) and WAN-PHY. And it is not under TAA compliance.

 

So when you're hesitating about buying Cisco SFP-10G-SR-S or SFP-10G-SR, you can check whether you are under the following application requirements. Only SFP-10G-SR is indicated for applications requiring any of the following.

 

Buying Guide of SFP-10G-SR-S vs SFP-10G-SR: 

• FCoE, OTN, or WAN-PHY support..

• Wider range operating temperature required. EXT (-5 to 85°C/23 to 185°F) or IND (-40 to 85°C/-40 to 185°F).

• TAA compliance.

• Optics deployed in non-temperature controlled environments, such as rugged/ industrial (RGD).

 

Otherwise, SFP-10G-SR-S is more recommended as a cheaper option compared to SFP-10G-SR. 

 


What is SFP-10G-LR?

Contrast to SFP-10G-SR, SFP-10G-LR is designed for long distance applications and LR means long reach. The distance limitation of 10GBASE LR is 10km over OS2 single-mode fiber (SMF) at 1310nm wavelength.

 

SFP-10G-LR Datasheet Overview

 

SFP-10G-LR Speed

10.3125 Gbps

SFP-10G-LR Distance

10km

SFP-10G-LR Connector Type

LC Duplex

Weight

20 g (0.7 oz)

SFP-10G-LR Fiber Cable(Single-mode or Multimode)

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

 


What is SFP-10G-LRM?

10G-SR only works with single-mode fiber (SMF) whereas 10G-LR only supports multimode fiber (MMF). However, 10G-LRM (long reach multimode) is special in allowing operations on both SMF and MMF. 

 

As we know, most existing 1G short distance interfaces are deployed based on 62.5µm OM1 multimode patch cables. The LRM module adopts advanced signal processing at the receiver to make it reach a distance of 220 meters on OM1. Therefore, 10G-LRM provides an ideal solution for upgrading from 1G to 10G. But, remarkably, to reach the max transmission distance of 220m, mode conditioning patch cord is required for OM1 and OM2 fibers. The 10G-LRM module also supports a link length of 300 meters over OS1/OS2 single-mode fiber.

 

SFP-10G-LRM Datasheet Overview

 

SFP-10G-LRM Speed

10.3125 Gbps

SFP-10G-LRM Distance

220m(OM1/OM2/OM3/OM4)

300m(OS1/OS2)

SFP-10G-LRM Connector Type

LC Duplex

Weight

20 g (0.7 oz)

SFP-10G-LRM Fiber Cable(Single-mode or Multimode)

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

 


What is SFP-10G-LR-S?

Similar to SFP-10G-SR-S, SFP-10G-LR-S is also a member of the Cisco S-class family, supporting only 10G Ethernet applications. SFP-10G-LR-S to SFP-10G-LR is what SFP-10G-SR-S is to SFP-10G-SR. As a cheaper alternative to SFP-10G-LR, SFP-10G-LR-S is effectively designed for cost saving for enterprise applications, which don’t have strict requirements for environment and temperature. How to choose between SFP-10G-LR vs SFP-10G-LR-S can refer to the above buying guide of SFP-10G-SR-S vs SFP-10G-SR.

 

SFP-10G-LR-S Datasheet Overview

 

SFP-10G-LR-S Speed

10.3125 Gbps

SFP-10G-LR-S Distance

10km

SFP-10G-LR-S Connector Type

LC Duplex

Weight

20 g (0.7 oz)

SFP-10G-LR-S Fiber Cable(Single-mode or Multimode)

SMF

Wavelength

1310nm

Temperature

COM (0 to 70°C)

FCoE Support

No

OTN Support

No

WAN-PHY Support

No

 


SFP-10G-SR-S vs SR vs LR vs LRM vs LR-S

The major differences between SFP-10G-SR-S, SFP-10G-SR, SFP-10G-LR, SFP-10G-LR-S and SFP-10G-LRM see table below for details.

 

Part Number 

SFP-10G-SR

SFP-10G-SR-S

SFP-10G-LR

SFP-10G-LR-S

SFP-10G-LRM

Distance

300m(OM3)400m(OM4)

300m(OM3)400m(OM4)

10km

10km

220m(MMF)

300m(SMF)

Fiber Cable

MMF

MMF

SMF

SMF

MMF/SMF

Wavelength

850nm

850nm

1310nm

1310nm

1310nm

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

 


Conclusion

 

The above article has introduced the most popular but confusing 10G optics transceiver types including 10GBASE SR, LR, LRM, SFP-10G-SR-S and SFP-10G-LR-S one by one, also comparing their differences. Whether you are looking for reliable 3rd party optics providers or hesitate about choosing your right optics option, you will get answers at QSFPTEK.COM. Customer experience representatives and tech support are available round-the-clock to receive your orders and inquiries at sales@qsfptek.com.

 

 

 

 

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