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ABC of GPON SFP: Understanding GPON OLT / ONU / ONT SFP Module

Since the advances in Ethernet technology, “last mile” connectivity is expected to realize between the network backbone and local area networks (end users). Gigabit Passive Optical Network (GPON) is a cost-effective point-to-multipoint access network, which brings great improvement in data transmission distance (up to 20km) and bandwidth (an downstream capacity of 2.5Gbit/s and an upstream capacity of 1.25Gbit/s ). However, GPON's higher bandwidth and split ratios are only achievable by using GPON-capable optical transceivers. It is well positioned to help meet the needs for higher bandwidth in FTTx applications, and continues to fuel growth in demand for GPON SFP modules. So this article will introduce the basics of GPON SFP, including GPON OLT, GPON ONU and GPON ONT SFP module.What Is GPON SFP Module?GPON SFP is a new higher-speed bi-directional optical transceiver, which can deliver 2.5 Gbits/sec of bandwidth. And it is a kind of single fiber transceiver which comes with SC connector and can transmit data up to 20km. In addition, it features a 28-dB optical loss budget to enable 1:64 split ratios and provides adequate optical loop lengths. Most EPON and some BPON systems deployed today use 25-dB optics, which limit the split ratio and loop length. For this reason, GPON transceiver enjoys the added advantage of industrial demand. The key performance advantage is to reduce the upstream split loss arising from utilizing the mode-coupled-receivers (MCR) in a PON application. Moreover, this innovative module dose not outweigh the costs over a standard module. For these two reasons, the GPON SFP modules are very attractive to the network operators to improve the utilization of GPON network. On top of that, GPON SFP transceiver is an essential part of GPON system which is necessary both for optical network unit (ONU) installed at the subscriber’s premises and for the optical line terminal (OLT) at the central office (CO). The following part will respectively introduce the GPON OLT, GPON ONU and GPON ONT SFP module.GPON OLT SFP ModuleGPON OLT SFP is designed for OLT side in GPON network. OLT is a equipment integrating L2/L3 switch function, which is located in central office (CO). The main function is to control the information float in both directions: upstream and downstream. The GPON OLT module plays an inevitable role in the upstream and downstream transmission. In order to put across the transmission process, the downstream transmission is taken as an example. A single mode optical fiber coming from OLT (at the central office) PON port, runs to the passive optical splitter (POS) located near end users. And then the optical splitter will divide signals into separate paths which can provide service up to 64 end users. In this basic GPON topology, a GPON OLT module is used to connect a single-mode fiber patch cable to a passive optical splitter. Therefore, GPON OLT transceiver works to get the data, voice and video traffic from metro network or from a long-haul network.GPON ONU/ONT SFP ModuleSince the ONU and ONT are deployed at customer’s premises, they are connected to the OLT by means of optical fiber and no active elements are present in the link. In GPON network, the ONU/ONT transceiver is the physical connection between the customer premises and the central office OLT. This type of modules gets the signals from OLT, so they have the opposite characteristic of GPON OLT transceiver, incorporating a high performance 1310nm burst mode DFB transmitter and 1490nm CW mode APD receiver. By being plugged into advanced “triple play” (data, voice & video) ONT or ONU equipment (with SFP ports), such as Ethernet switches, routers, DSLAMs or home gateway, ONU/ONT SFP module fits seamlessly into existing communications equipment and provides end users with a smooth upgrade to GPON. Therefore, GPON ONU/ONT SFP module plays an important role in the applications for point-to-multipoint (P2MP) ONT / ONU equipment in GPON network.ConclusionGPON SFP transceiver meets the the requirements of FTTx network to accelerate the speed or capacity. GPON OLT, ONU and ONT SFP module have their respective roles to play in the GPON networks. Many people may worry the high attenuation losses from optical splitter in the GPON networks, as above mentioned, the GPON optical module is just used to solve this problem in that it utilizes the MCR technology that protects large numbers of signals. In a word, this new module is a compelling network alternative to save cost and increase bandwidth and security.Related Article: ABC of PON: Understanding OLT, ONU, ONT and ODN

A Brief Introduction of Cisco BiDi SFP Transceiver

In the early stage of optical fiber communication, one optical fiber can only transmit signals of one wavelength. This is known as conventional two-fiber Bi-Directional communication - at least two fibers are needed to accomplish the full-duplex communication with TX and RX optical signals. With the development of WDM technology, transmitting and receiving of optical signals on separate wavelength can be achieved through only one single fiber. This single fiber BiDi transmission gradually becomes a popular and cost-effective solution for today’s data center and IT infrastructure, because it helps to maximize the capacity and usage of optical fibers. Consequently, BiDi optical transceiver as the basic component plays an irreplaceable role in the WDM BiDi transmission application. This article will generally introduce Cisco BiDi SFP transceivers, including GLC-BX-U, GLC-BX-D, GLC-BX-20U, GLC-BX-20D, GLC-BX40-D-I, GLC-BX40-U-I, GLC-BX80-D-I, GLC-BX80-U-I, GLC-BX120-U, GLC-BX120-D, etc.What Is a BiDi SFP?BiDi SFP transceiver can be defined as a compact, hot swappable, input/output optical module that can transmit and receive data to/from interconnected equipment through a single optical fiber. Unlike traditional optical transceivers, BiDi optical transceivers are fitted with wavelength division multiplexing (WDM) diplexers, which combine and separate data transmitted over a single fiber based on the wavelengths of the light. To simplify it, conventional optical module has two ports - the TX for the transmit port and the RX for receive port; but BiDi transceiver has only one port to complete the 1310nm optical signal transmitting and 1550nm optical signal receiving, or vice versa. Therefore, BiDi transceivers must be deployed in matched pairs with their diplexers tuned to match the expected wavelength of the transmitter and receiver. These BiDi optical transceivers can offer bi-directional data links over single-mode fiber up to 120 km. BiDi SFP transceiver is applicable to many access networks: passive optical networks (PON) and point-to-point, digital video and closed circuit television (CCTV) applications, inter-system communication between servers, switches, routers, optical add drop multiplexer (OADM), WDM fast Ethernet links, SDH/STM-1, SONET/OC3, metropolitan area networks and other optic link.Common Types of Cisco BiDi SFP1G BiDi SFP is also known as 1000BASE-BX SFP, which use two different wavelengths (1310nm-TX/1490nm-RX, 1310nm-TX/1550nm-RX, 1490nm-TX/1550nm-RX and 1510nm-TX/1570nm-RX) for transmission in different distance. The following will list some main Cisco BiDi SFP modules in 10km, 20km, 40km, 80km and 120km.10km Cisco BiDi SFPThe Cisco GLC-BX-D and GLC-BX-U is a pair of 10km BiDi SFP transceiver with LC duplex connectors, operating on a single strand of standard SMF. The GLC-BX-U transceiver operates at 1310nm-TX/1490nm-RX wavelength with upstream bidirectional single fiber, while the GLC-BX-D transceiver operates at 1490nm-TX/1310nm-RX wavelength with downstream bidirectional single fiber. These two BiDi optical modules, compliant to 1000Base-BX standard, are rated for distances up to 10 km over SMF and a maximum bandwidth of 1Gbps. A 1000BASE-BX-D device is always connected to a 1000BASE-BX-U device with a single strand of standard SMF. In addition, the GLC-BX-D and GLC-BX-U BiDi SFPs also support digital optical monitoring (DOM) functions according to the industry-standard SFF-8472 multisource agreement (MSA). This feature gives the end user the ability to monitor real-time parameters of the SFP, such as optical output power, optical input power, temperature and transceiver supply voltage.(GLC-2BX-U and GLC-2BX-D are 2-channel 1000BASE-BX SFP modules, also known as compact SFPs that integrate two IEEE 802.3ah 1000BASE-BX10 interfaces in one SFP module. They are designed to connect to any standard-based Customer Premises Equipment (CPE) in FTTx links.)20km Cisco BiDi SFPGLC-BX-20U and GLC-BX-20D are Cisco 20km BiDi SFP transceivers that work with single mode fiber. The GLC-BX-20U operates at 1310nm-TX/1550nm-RX wavelength, and GLC-BX-20D operates at 1550nm-TX/1310nm-RX. So these two BiDi SFPs always work in pairs. Their max data rate is 1000Mbps. FS.COM compatible Cisco BiDi transceivers are high performance, cost effective modules supporting data-rate of 1000Mbps and 20km transmission distance with SMF. Among the Cisco 20km BiDi SFPs, Cisco Linksys MFEBX1D provides up to 155Mbps bi-directional data transfer rate at distances up to 20km on a single fiber core. These bidirectional SFP transceivers allow data transfer in either direction through a single optical fiber by employing separate wavelengths travelling in either direction.40km Cisco BiDi SFPCisco GLC-BX40-D-I and GLC-BX40-U-I is a pair of 40km BiDi SFP modules for Gigabit Ethernet 1000BASE-BX and Fiber Channel communications. They support link length of up to 40km point to point on single mode fiber at 1Gbps bidirectional and use an LC connector. The GLC-BX40-D-I is 1550nm-TX/1310nm-RX 40km BiDi WDM SFP simplex transceiver module, GLC-BX40-U-I is 1310nm-TX/1550nm-RX BiDi WDM SFP module. They are specified for duplex optical data communications such as 1000BASE-BX Gigabit Ethernet per IEEE802.3z and 1G Fiber Channel extended reach application.80km Cisco BiDi SFPThe Cisco GLC-BX80-D-I and GLC-BX80-U-I SFPs are 1G BiDi SFP modules that provide 80km transmission distance over single strand of single-mode fiber. GLC-BX80-D-I operates at 1570nm-TX/1490nm-RX wavelength, whereas GLC-BX80-U-I operates at 1490nm-TX/1570nm-RX. These bidirectional SFP transceivers are intended mainly for connecting high-speed hubs, Ethernet switches, and routers together in different wiring closets or buildings using long cabling runs, and developed to support longer-length on fiber backbones. Compared with commonly used dual fiber SFP transceiver modules, the BiDi SFP transceiver allows end users to reduce the total cost on fiber cabling infrastructure by requiring half of fiber cables, providing increased transmission capacity very convenient without installing new fibers.120km Cisco BiDi SFPThe Cisco GLC-BX120-U and GLC-BX120-D are 1490nm and 1550nm bidirectional SFP transceivers that are used with single mode optical fiber. They also use two wavelength 1490nm-TX/1550nm-RX(1550nm-TX/1490nm-RX) simultaneously. These BiDi SFP modules can support transmission distance up to 120 km, which are connected through pluggable LC connector type optical interface. They have a DFB (Distributed Feedback) type transmitter, an APD (Avalanche Photo-Diode) type receiver, an LD (Laser Driver), a limiting amplifier and digital diagnostic monitor. Those BiDi SFP transceivers are Class 1 laser safety product which complies with US FDA regulations, SFP MSA, SFF-8472 and RoHS standards. More importantly, 120km SFP modules have the same or even lower transmit power as compared to 80km SFP. It is the reason that 120km modules extend the range thanks to receiver not transmitter. 120km modules have much better receiving sensitivity than 80km modules.ConclusionBiDi SFP transceiver serves as an ideal and feasible solution in situations where only limited fibers or limited conduit space is available. And the deployment of BiDi optical transceivers efficiently enhances the bandwidth capacity of the existing optical fiber infrastructure and help to achieve economical and reliable performance of the optical network. Although BiDi transceivers may be more expensive than common transceiver modules, they can save you the cost on fiber cables from the long run.

1000BASE-SX SFP Multimode VS. 1000BASE-LX SFP Single-mode

1000BASE-X is a group of standards for Ethernet physical layer standards, which is used for gigabit Ethernet connections that transmit data mainly over fiber optic cable or copper-shielded cable. There are several 1000BASE-X interface types used in SFP transceiver modules, including 1000BASE-SX, 1000BASE-LX and 1000BASE-EX. Besides, SFP transceivers are available with different transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required optical reach over the available optical fiber type (eg: multimode fiber or single-mode fiber). 1000BASE-LX SFP and 1000BASE-SX SFP are two common types of optical transceiver modules in the market. Today’s topic will discuss 1000BASE-SX SFP multimode vs. 1000BASE-LX SFP single-mode.1000BASE-SX SFP VS. 1000BASE-LX SFP1000BASE-SX SFP Transceivers for Multimode Fiber Only1000BASE-SX is a physical layer specification for Gigabit Ethernet over fiber optic cabling as defined in IEEE 802.3z. The SX systems operate full-duplex with multimode fiber only, using the cheaper 850nm wavelength laser diodes. The maximum distance supported varies between 220 and 550 meters depending on the bandwidth and attenuation of the fiber optic cable used. The standard 1000Base-SX NICs available today are full-duplex and incorporate LC fiber connectors. So 1000BASE-SX SFP supports link length of up to 550m (depending on fiber type) on multimode fiber at 1Gbps. This optic works at 850nm wavelength and uses a LC connector. Take Cisco GLC-SX-MM for example, this 1000BASE-SX SFP transceiver is able to realize 550m link length through OM2 MMF with LC duplex.1000BASE-LX SFP Transceivers for Both Multimode and Single-Mode FibersAs opposed to 1000Base-SX, 1000BASE-LX uses long wavelength laser over both multimode and single-mode fiber. It has a working distance of up to 10 km over single-mode optic fiber, and a maximum length of 550 meters on multimode fiber. So the 1000BASE-LX SFP can operate on standard single-mode fiber optic link spans of up to 10 km, and up to 550 m on any multimode fibers. Arista Networks SFP-1G-LX is 1000BASE-LX SFP transceiver that operates over a wavelength of 1310nm for 10 km on SMF and 550m on MMF.Single-mode SFP VS. Multimode SFPSFP modules can be divided into single-mode SFP and multimode SFP modules. For single-mode SFP modules, there are “LX” for 1310nm and “EX” “EZX” for 1550nm. Single-mode fiber SFP is designed to transmit signals over long distances. So the single-mode module works mainly in the 1310nm and 1550nm wavelengths and is mostly used in a long distances transmission environment reaching 2 km, 10 km, 40 km, 60 km, 80 km and 120 km. For example, Cisco GLC-ZX-SM is a single-mode module, which operates over a wavelength of 1550nm for 80 km.Single-mode SFP(extraction lever):LX - 1310 up to 10kmEX - 1310 up to 40kmZX - 1550 up to 80 km using green ex leverEZX - 1550 up to 160 kmNOTE:Black color coded bale clasp designates a Multi-mode SFPBlue color coded bale clasp designates the 1310nm SFPComparatively, multimode SFP transceivers are identified with “SX”. This MMF SFP optics is specially for short distance data transmission. The common multimode SFP modules work in 850nm wavelength and is only used for short distance transmission reaching 100m and 500m. Though it’s not able to transport for long distance, it can transport many kinds of optical signals. For instance, Cisco GLC-SX-MMD is a typical multimode fiber transceiver, which operates over a wavelength of 850nm for 550m.1000BASE-SX SFP Multimode VS. 1000BASE-LX SFP Single-modeStandardSX stands for short wavelength. The standard specifies a distance capability between 220 meters and 550 meters. The “LX” in 1000BASE-LX stands for long wavelength, indicating that this version of Gigabit Ethernet is intended for use with long-wavelength transmissions (1270 - 1355nm) over long cable runs of fiber optic cabling. 1000BASE-LX can run over both single mode fiber and multimode fiber with a distance of up to 10 km and 550 m, respectively.Types of Optical Fibers1000BASE-LX single-mode SFP module will work with single-mode fiber in order to perform both transmission and reception of data. Whereas 1000BASE-SX multimode SFP transceiver will work with multimode fiber, which has a thicker core and allows higher speed at shorter distance.Transmission Distance1000BASE-LX single-mode SFP transceivers are mostly used in long distances (up to 10 km) transmission environment. 1000BASE-SX SFP multimode is only used for short distances (up to 550m), like in small area or within the building.Wavelength1000BASE-LX single-mode SFP works in 1310nm, whereas 1000BASE-SX SFP multimode works in 850nm.Transmission Medium1000BASE-LX single-mode SFP transport the optical signal for long distance, but there is only one signal in the “tunel”. 1000BASE-SX multimode SFP has many optical signal in one “tunel”, the signals may affect each other. So it can transport many kind of optical signals.Dispersion1000BASE-SX multimode optics are affected by modal dispersion, because the light rays follow different paths through the fiber and arrive at different times on the other end. This is the main reason the distance on this type of optic is limited. Whereas 1000BASE-LX single-mode optics are affected by wave guide dispersion, caused by the light going down the fiber being wider than the core of the fiber. This allows more control of the path of the photons, but is more affected by micro bends, twists and stress on the fiber.ConclusionThrough 1000BASE-SX SFP multimode vs. 1000BASE-LX SFP single-mode, we could actually conclude that the 1000BASE-SX standard was developed to support lower cost multimode fiber running in horizontal and shorter-length backbone applications, while the 1000BASE-LX standard was developed to support longer-length multimode building fiber backbones and single mode campus backbones. With so many types of SFP modules available in the market, careful notice should be given to the range of differences, including transmission distance, wavelength, cable types, price, etc.Related Article: The Basics of 1000BASE-SX and 1000BASE-LX SFP

EPON SFP VS. GPON SFP: Cost-effective Solution for Access Network

With the increasing demands for higher capacity, more diversity and more personalization of services, the capacity and versatility of access networks needs to be expanded. Passive optical network (PON), as a major technology of FTTH, offers point-to-multipoint (P2MP) network access with lower installation and maintenance costs. EPON (Ethernet PON) and GPON (Gigabit PON) are popular versions of PONs at present. The related technologies keep developing and meanwhile the market of PON components keep growing. PON transceiver (EPON SFP or GPON SFP) is an essential part of PON system, in which a single fiber from a central office optical network unit (ONU) is connected to optical network terminals (ONTs) or optical network units (ONUs) at costomer premises. EPON SFP vs. GPON SFP is today’s main subject matter of this paper.Passive Optical Network (PON)Passive optical network (PON) is a form of fiber-optic access network. As the leading technology being used in FTTx (FTTH) deployments, so it is also called FTTH (fiber to the home) network. The typical PON arrangement is a point to multi-point (P2MP) network where a central optical line terminal (OLT) at the service provider’s facility distributes TV or Internet service to as many as 16 to 128 customers per fiber line. A PON reduces the amount of fiber and central office equipment required compared with point-to-point architectures. PON only uses fiber and passive components, thus it costs significantly less than those using active components. However, a PON has a shorter range of coverage limited by signal strength, which is typically limited to fiber cable runs of up to 20 km (12 miles). There are two different solutions developed by the IEEE and ITU-T - EPON and GPON. The main differences between them lie in the protocols used for upstream and downstream communications. The following table shows the detailed information about EPON vs. GPON.Table 1: EPON vs. GPONWhat Is PON Transceiver?PON transceiver is a bi-directional optical transceiver that uses different wavelengths to transmit and receive signals between the OLT at the CO and the ONUs at the end users’ premises over a single fiber. According to the pluged-in device, PON transceiver can be divided into OLT transceiver module and ONU transceiver module with SFF, SFP/SFP+ or XFP package. Here mainly introduce two common OLT transceivers used in GPON or EPON network: GPON SFP and EPON SFP.GPON SFPGPON SFP OLT transceiver is designed for OLT side in GPON network. GPON SFP uses 1490nm continuous-mode transmitter and 1310nm burst-mode receiver. The transmitter section uses a 1490nm DFB (Distributed Feed Back) LD with automatic power control (APC) function and temperature compensation circuitry to ensure stable extinction ratio overall operating temperature range. And it is Class I laser compliant IEC825 and CDRH standards. The receiver has a hermetically packaged burst-mode APD-TIA (trans-impedance amplifier) pre-amplifier and a burst-mode limiting amplifier with LVPECL compatible differential outputs. The GPON OLT SFP transceiver is a high performance and cost-effective module for serial optical data communication applications to 2.5Gpbs. For GPON transceivers, there are 2 Class available - Class B+ and Class C+. The table below shows the key differences between GPON SFP class B+ and class C+:Table 2: GPON SFP class B+ vs. GPON SFP class C+EPON SFPEPON SFP transceiver is the family of high performance optical modules providing a symmetric 1.25 Gb/s downstream and 1.25 Gb/s upstream data link over a single fiber using a 1490 nm continuous-mode transmitter and 1310 nm burst-mode receiver. The transmitter section uses a 1490nm DFB laser for superior performance and is Class 1 laser compliant. The receiver section uses a 1310nm APD, pre-amplifier, and limiting post-amplifier. The receiver does not require a reset pulse between incoming optical packets of varying signal strength. EPON SFP OLT transceivers support 1000BASE-PX20-D for 20 km applications.EPON SFP VS. GPON SFPIn terms of OLT module, there are many similarities through EPON SFP?vs. GPON SFP, such as type of laser, transmission distance and communication model. The key difference among them is the sending power and receiver sensitivity. The sending power of GPON SFP Class B+ is 1.5~5dBm, and its receiver sensitivity is -28dBm while the sending power of Class C+ is 3~7dBm and receiver sensitivity is -32dBm. The sending power of EPON SFP is 2~7dBm and its receiver sensitivity is -28dBm. For GPON SFP, the upstream bandwidth is scalable from 155Mbps to 2.5Gbps while the downstream is designed to deliver 1.25Gbps or 2.5Gbps. It is the most widely used consumer broadband service in FTTH networks of present times. On the other hand, EPON SFP supports symmetric bandwidth of 1.25Gbps in both the upstream and downstream directions.Table 3: EPON SFP vs. GPON SFPConclusionThrough EPON SFP VS. GPON SFP, we can see that they are the same in architecture but for different data rate and applications. In terms of cost, The GPON SFP optical module is more expensive than EPON SFP. Because the GPON chipsets available in the market are mostly based on FPGA (Field Programmable Gate Array), which is more expensive than the EPON MAC (Media Access Control) layer ASIC. When GPON reaches deployment stage, the estimated cost of a GPON OLT is 1.5 to 2 times higher than an EPON OLT. For the users who have demands of multi-service, high QoS and security, as well as ATM backbone network, GPON SFP seems to be an ideal. And for the one who is much care about the cost and has less security requirements, EPON SFP may be better.Related Article: Passive Optical Network Tutorial

Unveil 10G DWDM Tunable SFP+

Optical transceivers play a key role in handling all storage, data, voice and video traffic whether linking rack to rack, bottom to top of rack, data center to data center or enterprise networks to network. A range of flexible fiber optic transceiver modules cover all of network needs, such as SFP, SFP+, QSFP, QSFP28, CFP, etc. But for 10G DWDM tunable SFP+, many people might find themselves in the mire. When I first heard about this tunable transceiver, I thought that it would definitely bring revolutionary change to future metro Ethernet and optical transport networks with its important practical value for flexibly selecting working wavelength. So this article will unveil all of the things about tunable SFP+ optical transceiver.About 10G DWDM Tunable SFP+As the demand for great traffic capacity keeps growing, more optical transceivers of different wavelengths are needed. So tunable transceivers are recent innovations in DWDM transport systems. DWDM tunable transceivers are within the scope of DWDM transceivers, through which different DWDM wavelengths can be configured and output in the same optical module. But compare with conventional fixed-wavelength DWDM SFP+, the tunable SFP+ uses tunable laser as light sources in DWDM systems, which is tunable across the entire C-band with 96 channels on the ITU-T 50-GHz grid.The tunable laser technology is firstly introduced by Oclaro, a leading supplier and and innovator of tunable laser and transceiver solutions. In 2013, it announced a standards-compliant, multi-rate tunable SFP+, which supports rates between 9.95 and 11.3 Gbps. But the first-generation tunable SFP+ optical transceivers were not widely adopted, because they did not meet the critical requirement of less than 1.5 W of power consumption at high operating temperatures. So in 2014, Oclaro demonstrated a new tunable SFP+ module based on a new Oclaro InP tunable laser platform. With the innovative new chip design and the use of next generation materials, the new module is fully compliant to the SFP MSA form factor and can operate at 1.5W at 70 degrees C with excellent OSNR tolerance. With the breakthrough of technology, the 10G tunable SFP+ transceivers become an important component for next generation data center, metro and regional optical network equipment. They meet the world’s growing bandwidth demands while reducing the size and power consumption for 10G connections.Key Highlights of Tunable SFP+ Module:(1) Fully compliant with MSA standard size based on SFF-8432 specification for Improved Pluggable Form Factor, rev. 5.1(2) Tunable across the full C-band with 96 channels on the ITU-T 50GHz grid(3) Multi-rate operation: 9.95 Gbit/s to 11.3 Gbit/s(4) Operates at 1.5W at 70 degrees C with excellent OSNR toleranceAdvantages of Tunable SFP+The tunable SFP+ transceivers are high-performance optics which can be tuned to the appropriate wavelength. The ability to operate on various wavelengths has set these optics apart from fixed-wavelength DWDM SFP+. Besides, These tunable optics will become popular among DWDM systems due to the several advantages.Flexible network managementA tunable SFP+ transceiver will be remotely configured for a specific wavelength to support bandwidth changes as needed in Enterprise or Metro networks.Reduced network inventoryOne tunable SFP+ transceiver will support more than 80 different wavelengths. It will allow network operators to hold one tunable device code as opposed to 80+ fixed wavelength transceivers.Reduced power consumptionIt will provide a significant reduction in electrical power dissipation compared to other tunable solutions.Compact and high-density form factorThe new tunable SFP+ transceiver will be about the size of a pack of gum, saving valuable real estate in data centers.Increased network capacityThe tunable SFP+ will double the number of channels supported in this compact transceiver form factor. Upgrading to 50GHz channel spacing doubles the capacity potential in Enterprise and Metro networks.ConclusionThe advent of 10G DWDM tunable SFP+ transceivers in the market will accelerate the trend for pace-, power-, and cost-efficient network solutions. Because tunability is critical for minimizing inventory and enabling flexible rapid service provisioning. Although now the market share for DWDM tunable SFP+ transceiver is not big enough, the huge potential will be demonstrated in the near future.

Compatible Optical Transceivers for Cisco Catalyst 9500 Switches

According to a recent survey, over half (57%) of companies have already adopted the Internet of Things (IoT) technology. By 2019, that statistic is projected to reach 85% as the expectations for IoT to deliver value and innovation continue to grow. Many advocates are struggling to secure IoT devices. To lead the pack in the switches markets, Cisco recently announced the Catalyst 9500 Series switches, which are designed for security, IoT and the cloud. The switches will be the next generation of the most widely deployed switching platform. Here in this article will take you to understand more about Catalyst 9500 switches and which optical transceivers are compatible for it.Cisco Catalyst 9500 Switches - Built for Security, IoT, and CloudThe Cisco catalyst 9500 series switches are the next generation of enterprise-class core and aggregation layer switches, which are part of the new Cisco catalyst 9000 family. These switches come with 4-core 2.4-GHz CPU, 16-GB DDR4 memory and 16-GB internal storage. The catalyst 9500 comes in three different varieties: Catalyst 9500-24Q, Catalyst 9500-12Q and Catalyst 9500-40X. They support 10G and 40G Gigabit Ethernet network connection. The most important feature is that these switches support the advanced routing and infrastructure services, such as MPLS L2/L3 VPNs and MVPN. And they are designed for full fabric-control with Cisco DNA and Software-Defined Access (SD-Access). Therefore, these switches deliver stellar performance and functionality and extend Cisco’s networking leadership with significant innovations in security, mobility, IoT and cloud.ModelDescriptionTotal QSFP or SFP+ PortsCatalyst 9500-24QCisco catalyst 9500 series 24-port 40 Gigabit Ethernet with QSFP24 QSFP/24 SFP+Catalyst 9500-12QCisco catalyst 9500 series 12-port 40 Gigabit Ethernet with QSFP12 QSFP/12 SFP+Catalyst 9500-40XCisco catalyst 9500 series 40-port 10 Gigabit Ethernet with SFP+40 SFP+ Software-Defined Access for Cisco Catalyst 9500 SwitchesThe Cisco catalyst 9500 series switches form the foundational building block for Software-Defined Access. Software-Defined Access is the industry’s first intent-based networking solution for the Enterprise built on the principles of Cisco’s Digital Network Architecture (DNA). It is an open and extensible, software-driven architecture that accelerates and simplifies your enterprise network operations. The programmable architecture frees your IT staff from time-consuming, repetitive network configuration tasks. Compared catalyst 9500 to the older switches, it performs more benefits for customers:Reduced cost and complexity with Cisco Software-Defined Access by automating policy, enabling fast service creation and providing complete visibility into the wired and wireless access networks.Create better customer and employee experiences through higher performance and improved support for mobility and new apps.Advanced end-to-end security to handle threats before, during and after attacks. Compatible QSFP+ / SFP+ Transceivers for Cisco Catalyst 9500 SwitchesAccording to Cisco 10/40 Gigabit Ethernet Transceiver Modules Compatibility Matrix, C9500-12Q, C9500-24Q and C9500-40X can support SFP-10G-ER, SFP-10G-ZR, SFP-10G-ER-S, SFP-10G-ZR-S, QSFP-40G-SR4, QSFP-40G-LR4, SFP-40G-SR4-S ect. QSFP+ TransceiversTransceiver ModelPart IDTransceiver DescriptionQSFP-40G-SR436157Cisco QSFP-40G-SR4 Compatible 40GBASE-SR4 QSFP+ 850nm 150m MTP/MPO DOM Transceiver, $ 49.00QSFP-40G-CSR436165Cisco QSFP-40G-CSR4 Compatible 40GBASE-CSR4 QSFP+ 850nm 400m MTP/MPO DOM Transceiver, $ 59.00QSFP-40G-SR4-S36143Cisco QSFP-40G-SR4-S Compatible 40GBASE-SR4 QSFP+ 850nm 150m MTP/MPO DOM Transceiver, $ 49.00QSFP-40G-LR436170Cisco QSFP-40G-LR4 Compatible 40GBASE-LR4 and OTU3 QSFP+ 1310nm 10km LC DOM Transceiver, $ 340.00QSFP-40G-LR4-S36153Cisco QSFP-40G-LR4-S Compatible 40GBASE-LR4 QSFP+ 1310nm 10km LC DOM Transceiver, $ 340.00QSFP-40G-ER436173Cisco QSFP-40G-ER4 Compatible 40GBASE-ER4 and OTU3 QSFP+ 1310nm 40km LC DOM Transceiver, $ 1,500.00QSFP-40G-SR-BD48722Cisco QSFP-40G-SR-BD Compatible 40GBASE-SR Bi-Directional Duplex LC Transceiver, $ 300.00WSP-Q40GLR4L(except C9500-40X )36172Cisco WSP-Q40GLR4L Compatible 40GBASE-LR4L QSFP+ 1310nm 2km LC DOM Transceiver, $ 340.00 SFP+ TransceiversTransceiver ModelPart IDTransceiver DescriptionSFP-10G-SR11552Cisco SFP-10G-SR Compatible 10GBASE-SR SFP+ 850nm 300m DOM Transceiver, $ 16.00SFP-10G-SR-S36433Cisco SFP-10G-SR-S Compatible 10GBASE-SR SFP+ 850nm 300m DOM Transceiver, $ 16.00SFP-10G-LR11555Cisco SFP-10G-LR Compatible 10GBASE-LR SFP+ 1310nm 10km DOM Transceiver,$ 34.00SFP-10G-LR-S36434Cisco SFP-10G-LR-S Compatible 10GBASE-LR SFP+ 1310nm 10km DOM Transceive, $ 34.00SFP-10G-LRM(except C9500-24Q / C9500-12Q )11556Cisco SFP-10G-LRM Compatible 10GBASE-LRM SFP+ 1310nm 220m DOM Transceiver, $ 34.00SFP-10G-ER11557Cisco SFP-10G-ER Compatible 10GBASE-ER SFP+ 1550nm 40km DOM Transceiver, $ 149.00SFP-10G-ER-S36435Cisco SFP-10G-ER-S Compatible 10GBASE-ER SFP+ 1550nm 40km DOM Transceiver, $ 149.00SFP-10G-ZR11582Cisco SFP-10G-ZR Compatible 10GBASE-ZR/ZW and OTU2e SFP+ 1550nm 80km DOM Transceiver,$ 299.00SFP-10G-ZR-S36436Cisco SFP-10G-ZR-S Compatible 10GBASE-ZR/ZW and OTU2e SFP+ 1550nm 80km DOM Transceiver,$ 299.00Note: for C9500-24Q / C9500-12Q, the Transceivers should be used with CVR-QSFP-SFP10G.ConclusionThe catalyst 9500 switches solve some persistent challenges of enterprise networks by utilizing platform innovations built around four key areas: security, Internet of Things (IoT) convergence, mobility and cloud readiness. There is no doubt that catalyst 9500 is leading us to a new era of faster and securer network.