Comparison of 10GBASE-T and 10G SFP+ Transceiver

With the growing need of higher capacity network connectivity, 10G network transmission is becoming increasingly popular. 10G SFP+ optical transceiver and 10GBASE-T copper transceiver are the two main options of 10G network. It becomes a challenge to choose the appropriate 10G connectivity for every IT worker. This article will compare 10GBASE-T with 10G SFP+ transceiver from the perspectives of power, latency, cost and interoperability. And try to give you some suggestions to choose between them.

Brief Introduction of 10GBASE-T and 10G SFP+ Transceiver Module

10GBASE-T transceiver module and SFP+ optical transceiver are two of the most widely used 10G network connectivity.

10GBASE-T Copper Transceiver

Applied initially in the data center and the horizontal cabling system, 10GBASE-T transceiver module is a new 10GE PHY using the existing MAC (Media Access Controller). It preserves the 802.3/Ethernet frame format at the MAC Client service interface. 10GBase-T works at 100 meters for Cat6a cable and up to 50 meters for Cat6 cable. It offers flexibility, low cost transmission media, and is backward-compatible with existing 1GbE networks.

10gbase-t
10G SFP+ Optical Transceiver

10G SFP+ transceiver is an enhanced version of the SFP transceiver that supports data rates up to 16 Gbit/s. It supports 8 Gbit/s Fibre Channel, 10 Gigabit Ethernet and Optical Transport Network standard OTU2. SFP+ optical transceiver’s connector is duplex LC, and it operates on LC fiber patch cables. SFP+ transceiver is classified in different types, such as SR, LR, ER and ZR. They need to be used with appropriate fiber patch cable, like SR used with multimode fiber patch cable for short distance transmission, while LR, ER and ZR used with single mode fiber patch cable for relatively long links.

10g sfp+

10GBASE-T vs SFP+ Transceiver

After the brief introduction of the two transceiver modules, we will compare them from following perspectives.

Power and Latency

Recent advancements greatly lowered the power consumption of 10GBASE-T server and switch ports. Early versions of 10GBASE-T switches needed up to 12 Watts per port, switch vendors now offer a range of 1.5 to 4 Watts per port depending on distance. In spite of the reduced power consumption of 10GBASE-T transceiver, 10G SFP+ interface uses less power—typically less than 1 Watt per port.

With simplified electronics, 10G SFP+ transceiver also has lower latency—typically about 0.3 microseconds per link. 10GBASE-T transceiver latency is about 2.6 microseconds per link due to more complex encoding schemes within the equipment.

With lower power consumption and lower latency, 10G SFP+ optical transceiver is well suited for large high-speed data centers.

Cost and Interoperability

10GBASE-T switches has been available since 2008, the shipment of 10GBASE-T transceiver module has been increasing over the past years. This proliferation helps to drive down the cost of 10GBASE-T technology. With 10GBASE-T technology’s wide application, the use of 10G SFP+ transceiver module means additional cost for the servers equipped with 10GBASE-T NIC card. Comparing one of the latest 10G SFP+ and 10GBASE-T switches, the cost of 10GBASE-T transceiver ranges from 20% to 40% less.

10GBASE-T copper transceiver also has the advantage of being interoperable for using the familiar RJ45 connector and providing backwards compatibility with legacy networks. So it can be deployed in existing 1GbE switch infrastructures in data centers, enabling IT to keep costs down while offering an easy migration path to 10GbE. While 10GSFP+ optical transceiver are limited with little or no backwards compatibility.

Make an Informed Decision

When you choose between 10GSFP+ optical transceiver and 10GBASE-T copper transceiver, consider your needs carefully. If lower power consumption and lower latency are significant, 10GSFP+ transceiver might be the better choice for you. If lower cost and better Interoperability are important, 10GBASE-T transceiver might be more suitable for you. FS provides an extensive selection of 10GBASE-T, 10G SFP+ transceiver and transceiver module of other data rate, such as 1G, 25G, 40G, 100G and so on. For more details about FS 10GBASE-T transceiver module and 10G SFP+ optical transceiver, please contact us at sales@fs.com.

GLC-SX-MM VS GLC-SX-MMD VS GLC-SX-MM-RGD VS SFP-GE-S

Cisco is a worldwide leader in the telecommunication industry whose routers, switches are very welcome among the users. To work well with those Cisco networking applications, Cisco SFP transceivers are the best choice. GLC-SX-MM, GLC-SX-MMD, GLC-SX-MM-RGD and SFP-GE-S are different types of Cisco 1000BASE SFP transceiver module. All these transceiver modules comply with IEEE 802.3z 1000BASE standard. And since there are similar specifications for these four transceiver modules, users may be confused when they need to choose one SFP module for their Cisco switches. Here we’ll make a comparison of GLC-SX-MM, GLC-SX-MMD, GLC-SX-MM-RGD and SFP-GE-S transceiver modules to help you choose the suitable one.

GLC-SX-MM VS GLC-SX-MMD VS GLC-SX-MM-RGD VS SFP-GE-S

Which transceiver module will you choose?

Cisco Transceiver Datasheet

Here are the datasheets of these four different Cisco SFP transceiver modules.

GLC-SX-MM Datasheet

The GLC-SX-MM is programmed to be fully compatible and functional with all intended Cisco 1GB switching devices. This transceiver module operates on ordinary multimode fiber optic link spans of up to 550 meters in length.

Transceiver Module
GLC-SX-MM
Interface
LC duplex
Wavelength
850nm
Tx Power
-9.5 ~ – 3dBm
Receiver Sensitivity
< -17dBm
DOM Support
No
Temperature Range
0 to 70°C (32 to 158°F)
Cable Type
MMF
Price(US dollars)
6.00
GLC-SX-MMD Datasheet

The GLC-SX-MMD 1000BASE transceiver module is made for multimode fiber only. It’s the replacement of GLC-SX-MM which features an enhanced DOM interface. And this SFP fiber transceiver module operates on legacy 50 µm multimode fiber links up to 550 meters.

Transceiver Module
GLC-SX-MMD
Interface
LC duplex
Wavelength
850nm
Tx Power
-9.5 ~ – 3dBm
Receiver Sensitivity
< -17dBm
DOM Support
Yes
Temperature Range
0 to 70°C (32 to 158°F)
Cable Type
MMF
Price(US dollars)
6.00
GLC-SX-MM-RGD Datasheet

The GLC-SX-MM-RGD transceiver module is designed for Industrial Ethernet applications, including factory automation, intelligent transportation system and other deployments in hash environment. Compared with the ordinary transceivers which can endure the temperature ranging from 0 to 70°C,CLC-SX-MM-RGD can survive in the temperature from -40 to 85°C. It can support up to 550 meters of cabling.

Transceiver Module
GLC-SX-MM-RGD
Interface
LC duplex
Wavelength
850nm
Tx Power
-9.5 ~ – 3dBm
Receiver Sensitivity
< -17dBm
DOM Support
Yes
Temperature Range
-40 to 85°C (-40 to 185°F)
Cable Type
MMF
Price(US dollars)
6.00
SFP-GE-S Datasheet

The Cisco SFP-GE-S transceiver provides a high performance and cost-effective small form factor pluggable module for 1000BASE-SX Gigabit Ethernet and 1G Fiber Channel application. It’s designed for short wavelength applications. The max distance for this transceiver module is 550 meters. Besides, it also supports DOM.

Transceiver Module
SFP-GE-S
Interface
LC duplex
Wavelength
850nm
Tx Power
-9.5 ~ – 3dBm
Receiver Sensitivity
< -17dBm
DOM Support
Yes
Temperature Range
0 to 70°C (32 to 158°F)
Cable Type
MMF
Price(US dollars)
6.00

Differences of GLC-SX-MM VS GLC-SX-MMD VS GLC-SX-MM-RGD VS SFP-GE-S

From the above Cisco transceiver datasheet, we have learned that these Cisco transceiver modules share many similarities. All of them can support up to 550 meters over multimode fibers. And they are designed with the same 850m wavelength, Tx power and LC duplex interface. The main difference is the DOM (Digital Optical Monitoring) function and operating temperature.

·DOM function

Except GLC-SX-MM, all the others support DOM. With this function, users can monitor the transceiver module’s parameters in real time like optical input and output power, temperature and so on.

·Operating Temperature

GLC-SX-MM, GLC-SX-MMD and SFP-GE-S can work at the same temperature ranging from 0 to 70°C. But GLC-SX-MM-RGD SFP transceiver can work in a wider operating temperature of -40 to 85°, which is especially suitable for industrial Ethernet switches.

Conclusion

According to the above discussion, we can say GLC-SX-MM, GLC-SX-MMD, GLC-SX-MM-RGD and SFP-GE-S transceivers share many similarities. However, please note that the differences still exist, and ensure the transceiver module you choose will be compatible with the existing networking equipment. FS.COM is the one-stop shop to help you get these Cisco transceivers and other networking products that are compatible with the Cisco transceivers. If you have any questions in buying guide, please contact us via sales@fs.com.

What Is DWDM?

The Internet demand is always growing, especially the hugely popular video streaming services are increasing greatly. This provides a threat for the service provider. As the hottest topic in the telecommunication industry, DWDM offers unprecedented bandwidth which promises an effective solution to the challenges posted by the Internet growth. But what is DWDM, do you really know?

What Is DWDM?

DWDM wiki has defined it as an optical multiplexing technology. As one wavelength pattern of WDM system (the other pattern is CWDM), it stands for Dense Wavelength Division Multiplexing, which is used to increase bandwidth over existing fiber networks. This powerful technology can create multiple virtual optical fibers, so as to increase bandwidth on existing fiber optic backbones. It means that the fiber in DWDM system can transmit multiple signals of different wavelengths simultaneously. More specifically, the incoming signals are assigned to specific wavelengths within a designated frequency band, then the signals are multiplexed to one fiber. In addition, the most commonly used grid is the 100GHz grid, which consists of a spacing of 0.8nm per channel.

After knowing what is DWDM, we need to learn DWDM architecture. A typical DWDM architecture includes transmitter, receiver, optical amplifier, transponder, DWDM multiplexer and demultiplexer. Transmitter and receiver are the place where the source signal comes in and then multiplexed. Optical amplifier can amplify the signals in the wavelength range, which is very important for DWDM application. Transponder is the converter of wavelength. It’s responsible for converting the client optical signal back to an electrical signal. Multiplexer first combine multiple wavelengths of different fiber to one fiber, and at the receiving end, the demultiplexer separates all wavelengths of the composite signal onto individual fibers. Commonly, channels of DWDM Mux/Demux are available in 8, 16, 40 and 96 channels. All the DWDM basics work together to enable high capacity data flow in ultra-long distance transmission. The following figure is DWDM working principle.

what is DWDM

Why Use DWDM Technology?

The most obvious advantage of DWDM technology is providing the infinite transmission capacity, which would meet the increasing Internet demand. And more capacity can be added just by upgrading several equipment or increasing the number of lambdas on the optical fiber. Thus, the investment of DWDM technology has been reduced. Besides, DWDM technology also enjoys several other advantages, like the transparency and scalability.

Transparency. Due to DWDM is a physical layer architecture, it can support Time Division Multiplex and data formats like Gigabit Ethernet, Fiber Channel with open interfaces over a physical layer.

Scalability. It’s easy to be expanded. A single fiber can be divided into many channels, thus there is no need to add extra fiber but the wavelength will be increased. All these advantages make DWDM popular in the network.

Application of DWDM

As a new technology more applications of DWDM are yet to be tapped and explored. It was first deployed on long-haul routes. And now, DWDM technology is ready for long distance telecommunication operators. Using point to point or ring topology, the capacity will be dramatically improved without deploying an extra fiber. In the future, DWDM will continue to provide a higher bandwidth for the mass of data. With the development of technology, the system capacity will grow.

Conclusion

As for the question what is DWDM, I believe you have a good understanding of it. This powerful technology is related closely with current industry advancements trend. Now, service providers are faced with the sharp growth in demand for network capacity, DWDM is the best solution. With DWDM technology, the transmission work is no longer limited by the speed of available equipment, because it provides the high bandwidth without limit. We believe, DWDM will shine in the network world.

Best Way to Set Up Ethernet Switch and Mesh Network

Want to connect all your wired and wireless devices and expand your network with ease? Setting up an Ethernet switch and mesh network may be the best way. Because today it becomes increasingly difficult to use only a router to make your all connections since the approach of IoT. However, Ethernet switch and mesh network will function adequately no matter how many connections you want to make. Here focus on the Ethernet switch and mesh networking.

Why Mesh Networking?

Unlike the stand-alone routers, which will arise signal loss or strength drops when you go away from them, while mesh Wifi networks can use another connection to create a continuous wireless link which minimizes the possibility of dead zones. For example, you put your router in the downstairs living room. When you are on the first floor, your phone can connect to the Internet with a strong signal. But when you want to search the Internet in the upstairs office, the signal would degrade. Of course, you can boost a Wifi router’s connection with a signal amplifier. But in that situation, you have to manually connect your phone to the amplifier’s Wifi network. And if you go back to the downstairs, you have to switch back to the main router’s wireless network again. What a pain! Luckily, working with mesh Wifi networks, things are different. In a wireless network, all the nodes are connected with each other which means any node could be an Access Point (AP). Therefore, through the APs, wireless mesh network allows your phone automatically connects to the strongest signal no matter you are in the upstairs or downstairs. That’s better than what we could do with the traditional router Wifi networks.

mesh network_

Figure 1: Mesh network exists in our life.

When to Set Up Ethernet Switch and Mesh Network

If you want to build a wireless mesh network, using an Ethernet switch is a good choice. Before installation, you should consider how much coverage you need in your home. For many people, the money might be better spent on a Wifi router with good quality, since the mesh network equipment like the switches cost too much. But if you want to cover a large area with signal and your home brick is too solid for signal travel through, then use a switch to build wireless mesh network is a way to go.

Use FS Ethernet Switch to Build Mesh Network

Achieving a cheap mesh network is based on switches. FS.COM publishes a set of Gigabit Ethernet switch supporting 1G, 10G, 40G and 100G Ethernet, in order to meet different demands. All the Ethernet switches meet all design and safety standards made by international and industrial organizations like ISO9001, FCC etc.

The following is a 10Gb switch named S5800-48F4S. It has 48 1GbE SFP ports and 4 10GbE SFP+ ports. This switch is a Layer2/3 switch with low latency of 2.3us. With the switching capacity, it provides a throughput of 130.95MB. Besides, it supports functions like MLAG, SNMP and so, making it becomes popular on market. Following the S5800-48F4S switch installation guide, you can easily finish the switch installation. Then you can configure the bridge parameters of AP according to the installation instructions to build a mesh network.

48 port Ethernet switch

Figure 2: S5800-48F4S 48 Port Ethernet Switch

Conclusion

Due to mesh network advantages and disadvantages, we understand why and when to use wireless mesh network. Based on Ethernet switch, mesh networking can spread out fast Wifi across a relatively large area, which makes our life and work more efficiently. So don’t hesitate, pick one Ethernet switch from FS.COM to optimize your Wifi network.

Things About Cisco SFP Compatibility Matrix That Wiki Can’t Tell You

Transceiver module is the essential device of a network architecture. As a famous manufacturer of optical products, Cisco published a set of copper SFP transceiver modules to support copper networking. Here focus on Cisco SFP compatibility matrix to present a comprehensive Cisco SFP datasheet for you.

Overview of Cisco Copper SFP Transceiver Module

SFP stands for small form factor pluggable. Copper SFP transceiver is a hot-pluggable transceiver with RJ45 port, so it’s also called SFP RJ45 transceiver. SFP RJ45 transceiver supports 10/100/1000 BASE rate over Cat5 cables. In addition, RJ45 copper transceiver is usually used for transmitting data in a short distance, due to its transmission distance ranging from 10 to 30 meters or from 80 to 100 meters. And Cisco 1G SFP, copper and RJ45 Ethernet cables are much cheaper than the fiber ones, so it’s wise to choose a copper SFP transceiver to make use of the existing cabling system to optimize your network instead of using the fiber cables.

How to Choose A Cisco Copper SFP Transceiver Module

When you decide to buy a copper SFP transceiver, the quality and price matter a lot. But the price between OEM and the third party suppliers varies greatly. If you have plenty of money, you can order one directly from Cisco. If you search for a cost-effective solution, then the third party is a good choice. As for the quality, there are not many differences between Cisco and the third party’s products, because all products must meet the strict standards or MSA (Multisource Agreement). So it’s a wise decision to buy a copper SFP transceiver from a third party. Here I recommend you some copper SFP transceivers from FS.COM, whose transceivers are all tested before shipping.

SFP of Cisco SFP Compatibility Matrix

Figure: Choose a suitable copper SFP transceiver for your network

Cisco GLC-T Compatible 1000BASE-T SFP Transceiver

This GLC-T transceiver is a typical RJ45 transceiver, which is used for Cat5 wiring. The max data rate is 1000Mbps and the max cable distance is 100 meters, which is suitable to connect different switches or routers in a data center. It’s compatible with most Cisco switches and some FS switches like S5800-48F4S Gigabit SFP switch.

Cisco GLC-TA Compatible 10/100/1000BASE-T SFP Transceiver

Similar with GLC-T SFP, but this copper transceiver supports 10/100/1000 auto negotiation. And the operating temperature is different. It is an extended temperature range from -5 to 85°C, while GLC-T is from 0 to 70°C. Furthermore, it also operates on standard Cat5 unshielded twisted-pair copper cabling of link lengths up to 100 meters.

Cisco SFP Compatibility Matrix for GLC-T and GLC-TA

Both GLC-T and GLC-TA are supported on a wide range of Cisco equipment. Here lists some of Cisco network switches compatible with GLC-T and GLC-TA Cisco SFP compatibility matrix.

Switches Support GLC-T and GLC-TA
Cisco ME-2400-24TS-A
Cisco WS-C2940-8TF-S
Cisco ME-3400G-12CS-A
Cisco WS-C2960-24PC-L
Cisco ME-3400G-2CS-A
Cisco WS-C2960-48PST-L
Cisco ME-3400-24FS-A
Cisco WS-C2960G-48TC-L
Cisco 3750 ME-C3750-24TE-M
Cisco WS-C2960S-24TS-S
Cisco ME-3600X-24FS-M (SFP ports)
Cisco 2960S-F48TS-S
Cisco ME-3800X-24FS-M (client ports)
Cisco WS-C2970G-24TS-E
Cisco 4900 ME-4924-10GE
Cisco WS-C2975GS-48PS-L
Cisco 6500 ME-C6524GS-8S
Cisco WS-C3560-24PS
Cisco 2900 WS-C2948G-GE-TX
Cisco WS-C3560G-48TS
More supportable switches, please check Cisco Transceiver Compatibility Matrix.

Besides Cisco switches, GLC-T and GLC-TA can also be used on FS.COM S5800-48F4S switch which is a 48 port SFP L2/L3 MPLS switch with 4 10G SFP+ ports. It is a very cost-effective solution for traditional or fully virtualized data center.

Conclusion

Knowing Cisco SFP compatibility matrix can help us to choose the suitable transceiver and switch quickly. Cisco copper SFP transceiver modules produced by FS.COM can work well with Cisco switches and FS switches. Besides, our Cisco compatible SFPs are the most reliable quality products without high price, and supported by a long time warranty to offer you a great after-sales service. Know more about Cisco copper SFP modules, please visit FS.COM.

What Is QSFP56 and QSFP56-DD Transceiver Module?

Optical transceiver is one of the most important elements in data centers. Currently, QSFP28 transceiver module is the leading product on the market that supports 40 and 100 Gigabit Ethernet application. However, the world is constantly changing and evolving, new applications such as 4K HD video, webcast, VR and cloud computing have driven a sharp growth of network traffic. Therefore, today, QSFP56 and QSFP56-DD are developed to provide 200G or 400G applications, in order to satisfy people’s higher transmission speed.

Introduction of QSFP

In order to have a good understanding of QSFP56 and QSFP56-DD, we’d better know what QSFP is first. QSFP means Quad Small Form-Factor Pluggable, which is a compact, hot-pluggable transceiver. It’s an industry format that is developed and supported by many network component vendors, and it’s widely used to connect network switch, computer, server, video and some other communication systems. QSFP, QSFP56 and QSFP56-DD transceivers share the same package form, but their transmitting rates are different. This has lead to some other differences such as functions and applications, which will be explained in the following parts.

What Is QSFP56 Transceiver Module?

QSFP56 optical transceiver is the solution for 200G applications. It’s a pluggable transceiver module that has the same size as QSFP. However, this 200G transceiver can provide the top data rate of 50Gb/s of each channel. In addition, products of the transceiver will be compatible with previous QSFP standards. Therefore, the data center are able to reuse and easily refresh their systems designs and cost in an effective way. Communication specialists forecast that QSFP56 transceivers may accelerate the upgrade of the next generation network switches that the density of their front panel would be doubled, which will create more network throughput. QSFP56 will be the most competitive product due to its powerful processing capacity.

QSFP56

Figure 1: Example of QSFP56 Transceiver Connection

What Is QSFP56-DD Transceiver Module?

QSFP56-DD refers to a double-density QSFP optical transceiver that supports 200Gbps and 400Gbps Ethernet applications. It’s designed to employ eight lanes that operate up to 25Gb/s NRZ modulation or 50Gb/s PAM4 modulation. This means the new 400Gbps optical transceiver will increase the bandwidth and panel density by several times compared to the similarly sized QSFP transceivers. It’s based on the widely applied QSFP interconnection system, which is particularly suitable in data centers and HPC centers. In addition, this transceiver provides backward compatibility to lower-speed QSFP forms, so that when the technicians need to upgrade their networks to a higher speed, they could continue to use the other existing cabling infrastructure.

qsfp-dd-vs-qsfp

Figure 2: QSFP-DD vs QSFP

Conclusion

Traffic growth for data centers operators and service suppliers requires the adoption of 200G and 400G optical interfaces in the next generation of network devices. QSFP56 and QSFP56-DD transceiver modules are the best innovations to support customers with high speed and reliable connections. With these optical transceivers, technicians are able to achieve a breakthrough in network transmitting capability. We believe that the applications of QSFP56 and QSFP56-DD are the general trend in the future.

Related Article: Global Optical Transceiver Market: Striding to 200G and 400G

VPLS vs VPWS—How Much Do You Know?

Recently, network virtualization technology is the most popular and advanced technology both in our daily life and professional fields. There is a wide range of VPN technology available, such as VPLS and VPWS. Based on the use of Ethernet transport, VPLS and VPWS provide high-speed communications. But many business users who are seeking the most cost-efficient and efficient solutions for their network are confused when they face the two technologies VPLS and VPWS. Here focus on VPLS vs VPWS, to unveil their mysteries.

What Is VPLS

Virtual private LAN service (VPLS) is a Layer 2 technology that uses MPLS and VPN to connect different LANs over the Internet. It’s a point to multipoint service that enables geographically isolated sites to be connected through a MAN or a WAN. And all services in a VPLS are on the same LAN. CE and PE are the two basic concepts used in VPLS. CE stands for custom edge, which is the device like a router or a 10gbe switch at the customer premises. PE, the provider edge, is defined as the router at the network of the service provider. It’s typically connected with the CE and responsible for VPN access.

How VPLS Works?

Now let’s look at how VPLS works. In VPLS, first, the packet from a service provider network is sent to a CE device (for example, a 48 port 10gbe switch ). Then, the packet is sent to a PE router. It goes through the service provider network via the MPLS label-switched path. At last, when the packet arrives at the exist PE router, it will forward the traffic to the CE device at the destination customer site. For people who implement VPLS on a data switch, they will enjoy a fast, secure and homogeneous network with lower latency.

VPLS of VPLS vs VPWS

Figure 1: Example of VPLS

What Is VPWS?

Virtual private wire service or VPWS is built on MPLS network and provides point to point connections that connect end customer sites in a VPN. It’s also a Layer 2 technology that consists of three main elements, PE routers, Label Distribution Protocol (LDP) and Label Switched Path Tunnel. Unlike the traditional VPNs over Layer 2 circuits, which needs extra separate networks for IP and VPN services, VPWS can share the provider’s core network infrastructure between IP and Layer 2 VPN services. Thus, the cost of these services will be reduced. In addition, a VPWS Layer 2 VPN can be a full mesh or a hub and spoke topology. And MPLS is the tunneling in the core network. But other tunneling protocols like GRE also can be used in VPWS.

VPWS

Figure 2: Example of VPWS

VPLS vs VPWS: What Are the Differences?

From the above, we can see clearly that the biggest difference of VPLS vs VPWS is that the VPLS provides a point to multipoint servers, while the VPWS provides a point to point service. It means that the CE devices of VPLS and VPWS are different. For VPLS, the CE routers just send all traffic to the PE devices. In contrast, in VPWS, CE routers are used to carry out Layer 2 switching and have to decide which virtual wire could be used to send data to another customer site.

Conclusion

As regard with VPLS vs VPWS, we know they both can build a Layer 2 VPN service to meet today’s high speed network requirement. So don’t be hesitated, use your data switches or routers to set up a safety and efficient VPLS or VPWS service to optimize your network.

What Is DHCP and How It Works

To transmit data back and forth across the Internet, an IP address that administrators have to accomplish and configure on a router or Lay3 fiber switch is the essential cornerstone of a host. Besides, when you want to communicate with other networks, you need to know the default gateway address and subnet mask for the local network, as well as the DNS server. DHCP can help you get all the information dynamically. So what is DHCP and how it works?

What Is DHCP?

DHCP wiki defines the term dynamic host configuration protocol as a network management protocol used on UDP/IP networks. It assigns an IP address and some other configuration parameters to each network device automatically, so that the device will be authorized to communicate with other IP networks. This means users don’t need to configure the network, just plug the wire into your computer or connect to the WiFi, your computer will automatically receive the IP address, subnet mask, default gateway and DNS server. Then how to enable DHCP? DHCP can be installed on a single server or integrated in most network equipment like a Gigabit PoE switch, a router or even the firewall. The following are some related terms we should know.

  • DHCP Client—It obtains an IP address and other parameters from a DHCP server. It is the initiator of an IP address allocation.

  • DHCP Server—It assigns IP address and other parameters to the DHCP client.

  • DHCP Repeater—It forwards DHCP messages between a DHCP server and DHCP clients.

  • DHCP Snooping—It records the users’information that has applied for IP address through the layer 2 equipment.

What Are the Advantages of DHCP?

DHCP protocol reduces the complexity and numbers of administrative work by using automatic TCP/IP configuration. This is the greatest benefit. Today, no matter in the data center or at home, more and more devices are being networked from printers and fax machines to TV and fridges. Often times, these devices are placed in different locations, without DHCP, you have to get up out of your comfy chair and find the device and configure each manually. But assisted by DHCP protocol, all you need to do is changing the settings on the server or may be a 10gbe switch. As addresses are assigned automatically, there is no need to keep a record of the used and free ones. Besides, DHCP snooping can detect unauthorized DHCP server on the network.

How DHCP Works?

As the title mentions what is DHCP and how it works, now we have learned what DHCP is, let’s turn to its operation. In essence, DHCP leases IP address and other parameters to the specific clients for a period of time. The following picture shows how DHCP works.

What Is DHCP and How It Works

Step one: When a new client wants to join a network, it will broadcast a DHCP discover packet to the servers.

Step two: To answer the request, DHCP servers will send the free DHCP offer packet to the client.

Step three: The client takes the first DHCP offer message from different serves. Then it will send a DHCP request to the Internet to indicate which IP address it has taken.

Step four: DHCP server sends an acknowledge message to make sure the IP address has been used that will not assign to any other client. And now the client can participate on the network.

Conclusion

With regard to the question, what is DHCP and how it works, I think you have found the answer. Any questions of DHCP or network switch supporting DHCP, you can visit FS.COM or contact via sales@fs.com.

What Is IGMP Snooping

With the development of Internet technology, traditional network unicast mode can’t meet today’s data transmission requirement. On the contrary, this mode increases network load and consuming network bandwidth greatly. IGMP snooping is developed to solve the problem. So what is IGMP snooping?

Introduction of IGMP Snooping

IGMP (Internet Group Management Protocol) is a communications protocol. So what is IGMP used for? Commonly, it’s used to establish membership in a multicast group. And each member host of an IP multicast is a transmitter or receiver.

As for IGMP snooping, which sounds like an obscure hacker technique that may break into one’s network, is actually an advanced option available on most of switches or routers. Wiki defines it as the process of listening to IGMP network traffic. It is a multicast constraint mechanism running on the two-layer device, which is used to manage and control the multicast group. If there are plenty of multicast traffic in your network, the whole performance may be effected due to the excessive false flooding. At this moment, IGMP snooping switch can help to optimize your network. It enables the Gigabit Ethernet switch configured with IGMP snooping decides which devices will receive the applicable multicast traffic, thus the others won’t receive the message. This means broadcast packet on layer 2 has been reduced so that the network bandwidth will be conserved. Besides, IGMP snooping helps improve message information.

IGMP Snooping Process

After knowing what is IGMP snooping, let’s see how it works. Once a device joined the multicast group, the router or fiber switch will notice this. Then the message cab forwarded to the devices that have joined the multicast group. Look at Figure 1, when the switch runs without IGMP snooping, the multicast packet will be transmitted to host A, B and C. But when the switch has set up IGMP snooping, only multicast group members host A and C can receive the multicast packet. This is the main IGMP snooping tutorial.

What Is IGMP Snooping

Figure 1: The picture shows how IGMP works.

Using FS.COM Switch to Build IGMP Snooping 

To keep pace with the technology development, FS.COM releases a set of switches to help customers establish IGMP snooping. Here is a 24 port switch named S3700-24T4S. The 1G managed switch provides an affordable solution for business of all sizes requiring switches with essential L2 switching features like VLAN and IGMP snooping, along with a simple and intuitive management interface. It includes 24 10/100/1000Base-T Ports and 4 10G SFP+ ports to extend your home or business network at gigabit speeds. Equipped with ARM CPU and BCM53346 chip, the Lay 2 switch has a switching capacity of 128Gbps, which is compliant with the international standard.

Ethernet switch

Figure 2: S3700-24T4S 24 Port Switch

Conclusion

Now I think you know the answer of the question we posed at first, what is IGMP snooping. When IGMP snooping is enabled, the bandwidth consumption will be reduced in a multi-access LAN environment so as to avoid flooding the entire VLAN. Any question about IGMP snooping configuration, please contact us via support@feisu.com.

How to Use a PoE Injector to Install an IP Camera?

Are you looking for a solution to easily power your IP cameras? It’s no doubt to use a PoE injector or Gigabit PoE switch to complete the installation. Once your system is established, you can view your home circumstance from your computer or smartphone from anywhere. Here focus on how to use a PoE injector to install an IP camera.

What Does a PoE Injector Do?

Power over Ethernet is commonly regarded as PoE for short. It’s a technology that can transfer both power and data over twisted pair Ethernet cables such as Cat5e, Cat6, etc. A Poe injector is a device that is commonly known as the “midspan”. It supplies power to a camera by delivering power into the Ethernet cable. Usually, a power over Ethernet injector converts the alternating current into direct current so it can be the power supplier for low voltage IP camera.

What Does an IP Camera Do?

Unlike the traditional cameras, IP cameras can send and receive data over a LAN or the Internet. It’s a separated unit with its own IP address that needs nothing but a network connection like WiFi or PoE injector switch. IP cameras capture images just like a digital camera, and compress the files for transmission over the network. So these images can be viewed anywhere in the world. Also, this camera can be controlled remotely.

How to Use a PoE Injector to Install an IP Camera

Preparation

Before the installation, we should prepare a PoE injector, IP camera and Cat5e cables. Here, we will choose the products, single port 10/100/1000M Gigabit PoE injector, 3MP indoor/outdoor dome IP camera with infrared from FS.COM as an example.

  • Single port 10/100/1000M Gigabit PoE injector fully complies with IEEE 802.3af. It has two RJ45Ethernet ports, one is labeled Data In and one is labeled PoE/Data Out. With a power supply of 15.4W, this PoE injector for IP camera delivers power up to 100 meters. No configuration is required, just plug and play.

PoE injector

Figure 1: Example of PoE injector

  • 3MP indoor/outdoor dome IP camera with infrared is a professional surveillance and security solution for houses and enterprises. It provides video resolution of 2065×1553 pixels over a digital signal using Cat5e or Cat6, and observe high quality footage with the advanced SONY starvis back-illuminated CMOS sensor.

IP camera

Figure 2: Example of IP camera

Introduction

First, check the equipment, make sure the PoE injector and IP camera are in good condition. Besides, turn off the devices’ power for safe installation.

Second, plug one end of Cat5e cable into the PoE injector’s PoE/Data out port, and the other end into IP camera’s PoE port.

Third, choose a place to mount IP camera. Usually, the dome IP camera is installed on the roof corner that is adequate to capture the faces of subjects of different heights.

Fourth, use another Cat5e cable to connect PoE injector and a fiber switch.

Last, make sure all connection is correct. Then plug in power to ensure all connections are working normally.

Conclusion

The installation just requires several devices, a PoE injector, an IP camera, a non-PoE switch and some cables, or you can use a PoE switch like 24 port PoE switch to replace the PoE injector. Well, no matter which way you will choose to install your IP cameras, FS.COM is the one-stop shopping base when you need to buy these network devices.