Category Archives: SFP/SFP+


Glancing at modern network devices, people will see different built-in ports for different connections. For example, we use the USB interface in mobile phones to use RJ45 ports in copper wire switches. However what about SFP port? SFP ports are the built-in interfaces of various devices, including Gigabit switches, SFP switches, and network interface cards (NIC). Today we will talk about the LC SFP transceiver and SC SFP transceiver.

SFP SC vs LC: SFP-transceiver

Figure 1: SFP Transceiver

What Is SC Connector?

SC connector was developed in the mid-1980s. It is one of the first connectors to enter the market after the appearance of ceramic cores. With a spring loaded ceramic ring on the push pull connection end, SC is sometimes called “square connector”. Then it became popular with lower manufacturing costs. Because of its excellent performance, it occupies more than 10 years in the field of optical fiber, and only ST competes with it. Today it is still the second most common connector for polarization maintaining applications. SC is very suitable for data communications and telecommunication applications, including point to point and passive optical networks.

SFP LC vs SC: SC Connector

Figure 2: SC Connector

What Is LC Connector?

The LC connector is considered to be a modern substitute for the SC connector, and the introduction of the LC connector is not very smooth. As a push-pull connector, LC has latches instead of SC locking plates. Besides it has smaller rings, which are called small connectors. The half of the footprint of the SC connector makes it popular in data communications and other high-density patch applications. All these are because its small size and latch combination makes it an ideal choice for a densely populated rack / panel.

SFP LC vs SC: LC Connector

Figure 3: LC Connector

What Is SFP LC and What Is SFP SC?

LC SFP transceiver refers to 1000 BASE SFP transceiver with LC connector, including 1000 BASE-SX SFP, 1000 BASE-LX SFP transceiver module and so on. The SC SFP transceiver is a 1000BASE SFP transceiver with SC connectors.

SFP SC vs LC: How They Differ From Each Other

After having a basic understanding of SC and LC connectors, the next question is: what the difference between SC and LC? In general, the difference between LC and SC connectors lies in size, processing and connector history.

  • Size: LC is half of the size of SC. In fact, a SC adapter is exactly the same size as the duplex LC adapter. Therefore, LC is becoming more and more common in the central office. Because in the central office, the density of the packaging is an important cost factor.
  • Handling: Although there is a very innovative, real “push-pull LC” available, with the same handling power as SC. SC is a real “push pull connector”, and LC is a “lock connector”.
  • The history of the connector: LC is “younger” than SC, while SC is spreading wider around the world than LC. LC, however, is catching up.

As we all know, the main difference between SFP LC and SFP SC transceiver lies in the connector. Among the different types of SFPs with LC connector, 1000BASE-SX SFP and 1000BASE-LX SFP transceivers are most commonly used. We take these two transceivers as an example. The 1000BASE-SX SFP LC transceiver is suitable for multimode fiber cables less than 550 meters. The LC SFP LX transceiver is suitable for 10km single-mode optical fiber cables, and supports multimode fiber. The 1000BASE-SX LC SFP transceiver standard is designed to support low cost multimode optical fiber operation in horizontal and short length backbone applications. The LC SFP LX transceiver standard is designed to support a longer multimode building optical fiber backbone network and a single mode campus backbone network. The cost of the LC SFP LX transceiver exceeds that of the 1000BASE-SX SFP LC transceiver.


Current and future communication technologies require fast speed, high efficiency and security. All interconnected large complex databases must be able to receive and transmit data without external interference. Both SC and LC SFP transceivers are designed to achieve this transmission. You can choose whether LC SFP transceiver or SC SFP transceiver according to your needs. If you have any need for SFP transceiver, FS.COM can be your good choice.

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.