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SFP-10G-LR-S vs SFP-10G-LR: What’s the Difference?

As we all know, Cisco switches and fiber optic transceivers are considered as the benchmarks of the market. With the development of optical transceiver, Cisco has built a system to name each transceiver. For example, we often find Cisco C-class 10G transceiver like SFP-10G-LR. But there are S-class transceivers like SFP-10G-LR-S. You may be confused about their difference. That is why you should read this article. I will show you both of them and then make a comparison between SFP-10G-LR-S and SFP-10G-LR.

Basic Knowledge About SFP-10G-LR-S

SFP-10G-LR-S transceiver provides 10GBase-LR throughput up to 10 km over single mode fiber at a wavelength of 1310 nm using an LC duplex patch cable. SFP-10G-LR-S can be applied in enterprise and data center in which don’t require very long distance, temperature tolerances, or other special conditions. SFP-10G-LR-S can also support DOM which can help the administrator to monitor and make feedback of the operation of transceivers, including the temperature, the bias current of the laser diode and so on.


An Introduction of SFP-10G-LR

SFP-10G-LR transceiver is an LC duplex SFP+ transceiver for optical communications, rated for distances up to 10 km and a maximum bandwidth of 10Gbps. “LR” means long distance. The SFP-10G-LR transceiver operates at 1310nm wavelength. It can also support DOM, which is the same as SFP-10G-LR-S. DOM can provide more convenience for monitoring and operating as mentioned before.


SFP-10G-LR-S vs SFP-10G-LR

From their appearance and definition, SFP-10G-LR-S and SFP-10G-LR may be the same, but actually they have some differences in their protocols, temperatures and price.


SFP-10G-LR can support three protocols including Ethernet, OTN(Optical Transport Network) and WAN-PHY(Wide Area Network Physics). However, SFP-10G-LR-S can just support Ethernet protocol. In addition, SFP-10G-LR-S does not have TAA compliance.

Temperature Range

SFP-10G-LR-S and SFP-10G-LR transceivers have different temperature ranges. But the operating temperature range of SFP-10G-LR-S is smaller, so SFP-10G-LR-S is better for shorter transmission distance applications than SFP-10G-LR. If you design a project for an enterprise or data center environment that does not need too long distance, temperature tolerances, or other special request, SFP-10G-LR-S should be just fine for you.


Compared with SFP-10G-LR, SFP-10G-LR-S doesn’t have too many specials. And the performance of SFP-10G-LR-S are no better than that of SFP-10G-LR. But why do so many people insist to select SFP-10G-LR-S? This is because SFP-10G-LR-S has lower prices.


From this this article, we know that SFP-10G-LR is different from SFP-10G-LR-S in the sides of protocols, temperature ranges and price. Except the C-class and S-class SFP+ transceivers introduced in this article, there are still SFP-10G-SR and SFP-10G-SR-S transceiver. You can visit FS.COM for more information and choose the one fit for your needs.

What Is SFP Fiber Module?

Nowadays, almost all enterprise-class switches include two or more SFP (small form-factor pluggable) ports, allowing them to become part of a ring or star-based network topology spread among different buildings, floors or areas, and connected via fiber optic cabling. In many cases, SFP module is also known as GBIC (mini-Gigabit interface converter) modules, as they have replaced the older GBIC transceivers. SFPs can be used and interchanged on a wide variety of products, and they can be either SFP fiber module or SFP copper module.

What Is SFP Fiber Module?

SFP fiber modules are connected by fiber optical cables, which are available with a variety of transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required optical reach over multimode fiber or single-mode fiber.

sfp fiber module

Optical SFP modules are commonly available in several different categories with different features:

  • For multi-mode fiber, with black or beige extraction lever; for single-mode fiber, with blue extraction lever
  • SX – 850 nm, for a maximum of 550 m at 1.25 Gb/s (Gigabit Ethernet) or 150m at 4.25 Gb/s (Fibre Channel)
  • LX – 1310 nm, for distances up to 10 km
  • BX – 1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BS-U and BS-D for Uplink and Downlink respectively, also for distances up to 10 km
  • 1550 nm 40 km (XD), 80 km (ZX), 120 km (EX or EZX)

SFP Fiber Module Datasheet

With a wide application in optical network, many manufactures like Cisco and FS.COM provide a variety SFP modules. These models can be used on a wide variety of network equipment and intermixed in combinations of 1000BASE-T, 1000BASE-SX, 1000BASE-LX/LH, 1000BASE-EX, 1000BASE-ZX, or 1000BASE-BX10-D/U on a port-by-port basis. Part of the main products of Cisco SFP Fiber Modules are listed as below.

Product Wavelength (nm) Fiber Type Operating Distance (m) Transmit Power Range (dBm) Receive Power Range (dBm)
1000BASE-SX 850 MMF 220, 275, 500, 1000 -3 to -9.5 0 to -17
1000BASE-LX/LH 1310 MMF, SMF 550, 10000 -3 to -9.5 -3 to -20
1000BASE-EX 1310 SMF 40000 +3 to -1 +1 to -22
1000BASE-ZX 1550 SMF Around 70 km +5 to 0 -3 to -23
1000BASE-BX-U 1310 SMF 10000 3 to -9 -3 to -19.5
1000BASE-BX-D 1490 SMF 10000 3 to -9 -3 to -19.5
GLC-BX40-D-I 1550 SMF 40000 -5 to +3 -25 to +3
GLC-BX80-D-I 1490 SMF 80000 -2 to +3 -27 to +3
GLC-GE-DR-LX 1310 SMF 10000 -9.5 to -3 -25 to +3

SFP Fiber Module vs SFP Copper Module

SFP port can be plugged in with both SFP fiber module and SFP copper module. The biggest difference between SFP fiber module and SFP copper module lies in the cabling method. As it has been mentioned before, a SFP fiber module runs on a optical fiber (SMF/MMF). While a copper SFP works on a twisted copper cable (CAT5/CAT5a/cat6). Except for the cabling specification, their transmission distances and connectors are also different.

SFP Module Type Cabling Method Connector Transmission Distance Maximum transmission rate
SFP Fiber Module optical fiber RJ45 100m 1000 Mbps / 1 Gbps
SFP Copper Module twisted copper cable Duplex LC Over 100m 1000 Mbps / 1 Gbps


SFP module can connect various network devices such as switch, router, or fiber media converter to a fiber optic or copper networking cable. It is a popular industry format jointly developed and supported by many network component vendors. For SFP fiber module, it can transmit signal over a longer distance than SFP copper module. And the price for SFP fiber module is also cheaper than SFP copper module, so it gains more edges and popularity in the market of SFP modules.