Comparison Between Base-8 Connectivity and Base-12 Connectivity

As 10G network no longer satisfies the increasing demand for high speed data transmission, many data center managers turn to 40G network. Base-2 connectivity, based on increments of two fibers, is a common type of fiber optical link in 10G network. However, this kind of connectivity is not suitable for 40G network which needs high-density cabling. For 40G network cabling, there are two popular solutions—Base-8 connectivity and Base-12 connectivity. How much do you know about these two cabling solutions? Is there any difference between them? After reading this article, you will find the answer.

Base-12 Connectivity

In Base-12 system, Base-12 connectivity makes use of fiber optical links based on increments of 12 fibers. And 12-fiber or 24-fiber MTP/MPO optical connector assemblies are usually used to accomplish the links, such as 12-fiber or 24-fiber MTP trunk cable. Here is a figure of 24-fiber trunk cable used in Base-12 system for you.

Base-12 system using a 24-fiber trunk cable

Base-8 Connectivity

The Base-8 system still uses the MTP/MPO fiber connector, but the links are built in increments of 8 fibers (as shown in the following figure). Thus 8-fiber trunk cable, 16-fiber trunk cable and 24-fiber trunk cable can be easily found in Base-8 system. Here is a figure of 24-fiber trunk cable used in Base-8 system for you.

Base-8 system using a 24-fiber trunk cable

Comparison Between Base-8 Connectivity and Base-12 Connectivity

Since the number twelve is obviously larger than the number eight, Base-12 connectivity does provide the benefit of connector with higher fiber density compared to Base-8, and thus a larger number of fibers can be installed more quickly when using Base-12 connectivity. However, as 8-fiber transceivers are utilized in most deployments of 40G network, the benefit of matching the fiber count in the MTP backbone connectivity with the fiber count of the transceiver tends to outweigh the density benefit of Base-12 connectivity. In addition, in Base-12 connectivity, four fibers for transmit and four fibers for receive, leaving four fibers unused per connection. This will lead to a significant and costly loss in fiber network utilization. But Base-8 connectivity can be a more cost-effective option for end-to-end MPO to MPO channels and architectures. In fact, Base-8 connectivity is not an universal solution and Base-12 connectivity in some cases may still be more cost-effective. The following part describes the relative benefits when comparing Base-8 versus Base-12 connectivity for a data center deployment.

Benefits of Base-8 Connectivity
  • Optimized for both 2-fiber and 8-fiber transceiver technologies.
  • Enables 100% fiber utilization for 8-fiber transceiver systems without the additional cost and insertion loss of Base-12 to Base-8 conversion devices.
  • Cable harnesses can easily route to all common port counts on switch line cards.
  • Only requires unpinned MTP patch cords for any connections within the link.
  • Most flexible solution for 40G, 100G and 400G transmission networks.
Benefits of Base-12 Connectivity
  • Higher fiber per connector density than Base-8 connectivity.
  • Compatible with the large installed base of existing Base-12 MTP deployments.
  • Where proprietary vendor specific 40G duplex 2-fiber transceiver technologies are deployed, existing Base-12 data center infrastructures offer higher fiber density per connector (Note: the vendor specific technologies are incompatible with each other, and with parallel optics,which may add a level of management complexity in a multi-vendor environment.)
Conclusion

Base-12 connectivity has dominated the 40G network market for years, while the Base-8 connectivity is an additional option to ensure that data centers have the most cost-effective, future-proof network available. And both of them have their own benefits. As for which one to choose, it depends on the requirements of the network deployment. I hope this article can help you have a better understanding of this two cabling solutions.

Three Components Used for Modular Patching Solutions

In the age of the Internet, data communication industry is moving forward at a rapid speed. The size of data centers becomes bigger and the cabling system becomes more complicated. To satisfy high speed data transmission, high-density cabling is easy to be found in data centers. For data center managers, they not only have to think about the right connections between devices, but also have to take cable management into consideration. If the cables are not managed well at the beginning, cable management will be a nightmare at last. Therefore, it is essential to quickly and effectively manage your data center cabling at the first step. But is there any component can function like that? This article is going to introduce three fiber optic components to you—fiber adapter panel, MTP cassette and fiber enclosure.

Fiber Adapter Panel

Preloaded with fiber adapters, the fiber adapter panel is designed to assure flexibility and ease of network deployment and facilitate structured infrastructure. It is commonly used in high-density network applications for cross connections in main distribution, horizontal distribution, and equipment distribution areas. In addition, fiber adapter panel ensures efficient use of space, quick deployment and the highest reliability for the lowest installed cost, which in turn provides a high return on investment. The commonly used fiber adapter panels are LC fiber adapter panels, SC fiber adapter panels and MTP fiber adapter panels. Here is a picture for you, and from MTP MTP adapter, we can figure out it is MTP adapter panel.

MTP adapter panel

MTP Cassette

MTP cassette produced by many MPO MTP cassette manufacturers is usually fitted with 12 fibers or 24 fibers. Structured with LC or SC adapters on the front side of the cassette and MTP adapters at the rear of the cassette, MTP cassette provides secure transition between MTP and LC or SC discrete connectors. Therefore, it is commonly used to interconnect MTP backbones with LC or SC patching. The main advantage of MTP cassette is that it allows for rapid deployment of high density data center infrastructure as well as improved troubleshooting and reconfiguration during moves, adds and changes. You can have a better understanding of the inner structure of MTP cassette.

MTP cassette

Fiber Enclosure

Fiber enclosure can provide easy-to-manage cabling environments and strong protection for fiber optic cables. Besides, it can largely increase the working efficiency and decrease the costs for labor and time.There are two widely used designs of fiber enclosure in general: wall mount fiber enclosure and rack mount fiber enclosure. Here I take FS.COM fiber enclosures (FHD-1UFCE, FHD-2UFCE, FHD-4UFCE) for example, these three types of FHD fiber enclosures are with the size of 1RU, 2RU and 4RU respectively, which you can learn about from the figure below. Made of black powder coated SPCC rugged heavy-duty steel, the FHD fiber enclosures are designed with push/pull out functions, and have flexible mounting options, which are suitable for 10G/40G/100G cabling deployment.

FHD fiber enclosure

Applications

After getting a general understanding of fiber adapter panel, MTP cassette and FHD fiber enclosure, let’s come to how to use them in your network deployment. Usually, we have two modular patching solutions: fiber adapter panel with FHD fiber enclosure and MTP cassette with FHD fiber enclosure. When holding fiber adapter panels, FHD fiber enclosure can also hold fiber slack management spools to help manage the cables or optical splice trays to help store the spliced fiber pigtails. For example, besides housing the exact same number of fiber adapter panels, the FHD-1UFCE fiber enclosure can also hold two fiber slack management spools or four optical splice trays; the FHD-2UFCE fiber enclosure can hold two fiber slack management spools or eight optical splice trays; the FHD-4UFCE fiber enclosure can hold two fiber slack management spools or twelve optical splice trays. While when holding MTP cassettes, the number of MTP cassette increases with the expansion of the capacity of the FHD fiber enclosure. For example, the FHD-1UFCE fiber enclosure can hold up to four MTP cassettes; the FHD-2UFCE fiber enclosure eight MTP cassettes; the FHD-4UFCE fiber enclosure twelve MTP cassettes. However, if using FHD fiber enclosure with MTP cassettes, fiber slack management spools or optical splice trays cannot be installed inside the enclosure. As for which solution to choose, it all depends on your specific requirements of network deployment.

Conclusion

We know that how to quickly and effectively manage your data center cabling in the beginning is particularly important. Fiber adapter panel, MTP cassette and fiber enclosure can provide modular patching solutions for great capacity cabling management. And I hope this article is helpful for you.

Know More About Pre-terminated Trunk Cable Assemblies

In high-density data center environments, the ability to install cabling systems rapidly can save both time and money. Pre-terminated trunk cable assemblies provide ideal plug-and-play solutions for structure cabling—pre-terminated cabling solutions. These solutions simplify the design and installation of network services by providing high-density, end-to-end systems that deliver quick, plug-in network deployment. This article will guide you to know more about pre-terminated trunk cable assemblies.

Two Types of Pre-terminated Trunk Cables

Corresponding to fiber-based network deployment and copper-based network deployment, there are pre-terminated fiber cabling and pre-terminated copper cabling. The following part will introduce two types of commonly used pre-terminated trunk cable assemblies: pre-terminated fiber trunk cable, and pre-terminated copper trunk cable.

MTP/MPO Trunk Cable

Pre-terminated with MTP MPO connector on both ends, MTP/MPO trunk cable is a cost-effective alternative to time-consuming termination that improves reliability and reduces installation time and cost. It is capable of providing rapid deployment of high density backbones cabling in data centers and other high fiber environments. In networking applications, 12-fiber and 24-fiber MTP/MPO trunk cables are commonly used: 12-fiber MTP/MPO trunk cable is normally for 40G Ethernet network, while 24-fiber MTP/MPO trunk cable is normally for 100G Ethernet network. Since there are different types of MTP/MPO trunk cables on the market, it is important to choose the suitable one provided by reliable MPO trunk cable manufacturers. The following figure shows a high fiber count MTP/MPO trunk cable—72-fiber MTP/MPO trunk cable. There are 6 legs on both ends with each leg terminated with a 12-fiber MTP MPO connector.

72-fiber MTP MPO trunk cable

Pre-terminated Copper Trunk Cable

The pre-terminated copper trunk cable is a bundle of category cables, built with a choice of 6, 12, or 24 cable bundle and factory terminated with jacks and plugs. It allows fast and easy installation with reduced labor costs in large copper infrastructures with high-density cross-connection and patching systems. In recent years, this high-performance trunk cable has become a popular plug-and-play solution in the horizontal distribution area (HDA) to connect switch cabinets to server cabinets, and in the zone distribution area (ZDA) to run from the HDA to zone boxes. The pre-terminated copper trunk cable assemblies on the market are available in pre-bundled and pre-labeled styles, available in Cat 5e, Cat 6 and Cat 6a UTP and STP cable constructions with each available in jack to jack, plug to plug and jack to plug termination ends. Here is a figure of pre-terminated copper trunk cable for you.

pre-terminated copper trunk cable

Benefits of Pre-terminated Trunk Cable Assemblies

There are many benefits of deploying pre-terminated trunk cable assemblies.

High Speed of Deployment

The high speed of deployment offered by pre-terminated trunk cable assemblies is an equally important feature. The quick plug-in connections of network devices allow fiber and copper links to be installed in significantly less time than traditional field-terminated links, resulting in considerable installation-cost reductions. In many cases, pre-terminated trunk cables can cut installation time by up to 80% over field terminations.

Consistent High Levels of Performance

Pre-terminated trunk cable assemblies offer consistent high levels of performance for improved network integrity. Solutions are available that exceed specifications for high data transmission rate performance, providing extra headroom in the channel for data center upgrades and modifications. This level of reliability is crucial in the data center environment, where channel insertion loss budgets are very tight.

No Need for Performance Testing

The transmission testing of pre-terminated trunk cable assemblies is performed by the manufacturer before shipment, and test reports are included with the assemblies. This leaves only continuity testing for copper and 10% insertion loss and continuity testing for fiber, which reduces the time spent testing on-site.

Cut Clean-up Time

Pre-terminated cabling solutions allow for quick clean-up due to minimal leftover materials and scrap. Also, because there is less waste material to clean up, pre-terminated solutions also help meet green design, waste reduction, and material reuse goals.

Conclusion

Pre-terminated trunk cable assemblies provide an ideal plug-and-play solution for links between switches, servers, patch panels, and zone distribution areas in the data center. They can accelerate the process, reduce costs and errors, and can help bring your data center online in less time. If your data center or network application needs speed and testing simplified installation, pre-termination trunk assemblies are perfect.

Fiber Patch Panel Used in Cabling System

As high-density cabling becomes a trend, it is crucial to realize the simple cable installation and tidy cable organization, which can make the network performance achieve high level. It is not difficult to find that in the fiber-based cabling system, intermediate link connections are usually made at fiber patch panels to accommodate reconfigurations. Using fiber patch panels allows for high-density instant device to device connectivity. This article will introduce some basic knowledge about fiber patch panel.

Overview of Fiber Patch Panel

First of all, let’s have a brief overview of fiber patch panel. Fiber patch panel, also known as the fiber distribution panel, is used to terminate the fiber optic cable while providing access to the cable’s individual fibers for cross connection. A fiber patch panel is usually composed of two parts, the compartment that contains fiber adapters, and the compartment that contains fiber optic splice trays and excess fiber cables.

Advantages of Fiber Patch Panel

Advantage 1. Fiber patch panel is commonly used as a fiber optic cable management unit. The network technicians can use fiber optic patch cable to cross-connect, connect to fiber optic communication equipment or test the individual fibers in the fiber optic cable.

Advantage 2. Fiber patch panel provides a convenient way to operate fiber optic cable connections by plugging in or pulling out the fiber optic patch cable. And selecting signals, arranging or rearranging the circuits can be easily realized without the use of expensive dedicated switching equipment.

Advantage 3. Fiber patch panel can be an opened box which can create a safe environment for the exposed fibers and fiber optic cables. In the meantime, it can leave a space for fusion splicing and connections of fiber optic adapter components.

Advantage 4. Fiber patch panel can help with the installation of fiber optic cables as well as increase the density of installation. Also, it can provide more convenience for organization and management.

Components Used in Fiber Patch Panel

There are three most common components used in fiber patch panel—LC adapter panel, MTP to LC cassette and MTP adapter panel. LC adapter panel is preloaded with LC duplex adapters and it requires trunk cables with LC termination. The LC adapter panel offers the lowest connector loss of any of the patch panel modules. MTP-LC module is also called an MTP to LC cassette and converts MTP trunk cable to LC connections. This module type has LC connectors in front and MTP connectors in back. MTP adapter panel is preloaded with MTP adapters and it supports MTP trunk cable. Each MTP connection supports 8-12 fibers. The MTP adapter panel can easily support 12 MTP connections and 144 fibers or more.

Application of Fiber Patch Panel

In the 1 rack unit (1RU) patch panel drawn in figure below, LC adapter panel, MTP-LC module and MTP adapter panel are supported. These three types of patch panels support trunk cables terminated with MPO or LC connections. The trunk cables plug in the back of the patch panels and LC or MPO patch cords connect to the front of the patch panel. This modular patch panel architecture enables easy installation and scales well. With standard LC interfaces, this modular patch panel architecture supports 36 LC connections in a 1U patch panel. A 42RU rack full of these patch panel modules can support over one thousand fiber optic ports (42X36 = 1,512 LC ports).

Fiber Patch Panels Connections

Conclusion

Fiber patch panels are used in fiber optic management. Installing and managing fiber optic links is a tough thing to do because there are several (hundreds or even thousands) fiber optic cables and cable connections to manage. The fiber patch panels help in eliminating all the wire clutter by offering space and protection for all the fiber cables and cable links that are needed to by the technicians in setting fiber optic links. These panels make cable management, as well as troubleshooting work, a lot easier. And I hope after reading this article, you can have a better understanding of fiber patch panel used in cabling system.

Two High-Density MTP Components for 10G to 40G Cabling

Nowadays, people’s daily life has been inseparable from the network. With the rapid development of network technology, migration from 10GbE to 40GbE has become a hotspot. For data centers which are in the process of such migration, connecting 40GbE equipment with existing 10GbE equipment is what must be experienced. In addition, carrying out the migration smoothly is the greatest concern of many data center managers. In order to solve this problem, this article is going to introduce two high-density MTP components and their advantages in 10GbE to 40GbE cabling.

MTP to 4x LC Harness Cable

MTP-LC harness cable is terminated with a male/female MTP connector on one side and several duplex LC connectors on the other side, providing a transmission from multi-fiber cables to individual fibers or duplex connectors. It is typically used to connect equipment in racks to MTP terminated backbone cables. As shown in the following figure, the MTP to 4x LC harness cable uses a pinless MTP connector on one end for interfacing with the 40G QSFP+ port on the switch. While the other end contains 4 duplex LC connectors, which provide connectivity to the SFP+ ports on the switch.

MTP to 4x LC harness cable

Advantage of MTP to 4x LC Harness Cable

We know that 40G parallel optics transceivers (40GBASE-SR4) can support 4x10G modes. This feature allows new parallel optics active equipment to be compatible with existing 10G transceivers. And parallel optics 40GBASE-SR4 uses 8 out of 12 MTP interface fibers transmitting 4 x duplex (DX) channels (4 x transmit and 4 x receive). Designed for high density applications which require high performance and speedy installation without on-site termination, MTP-LC harness cables can realize the direction connection between higher-speed equipment (40G QSFP+) and slower-speed equipment (10G SFP+). This can greatly simplify the cabling system and make cable management easier.

40G QSFP+ Breakout Patch Panel

As shown in the picture below, the high density 40G QSFP+ breakout patch panel has 48 duplex LC ports front and 12 MTP Elite rear ports. It is designed to connect 40G QSFP+ ports with MTP fiber cable to the back of the patch panel and then this breaks out as 48x10GE on the front with LC fiber cable. As mentioned above, every 40G QSFP+ transceiver is connected to 4 SFP+ transceiver via 4 duplex LC connectors. Therefore, to makes 40G connect to 10G more simple and stable, the 40G QSFP+ breakout patch panel logically groups the ports in 4 duplex LC ports.

40G QSFP+ Breakout Patch Panel

Advantages of 40G QSFP+ Breakout Patch Panel

The high-density MTP LC patch panel is mainly used in 40G interconnect network hardware. With 12 QSFP+ MTP Elite rear ports and 48 SFP+ duplex LC ports front offered, 12x40G multimode QSFP+ MTP connections from MTP trunk cables easily breaks out as 48X10G LC connections. Therefore, it achieves 480G transmission in only one 1RU patch panel and since the patch panel can be located in the same rack as the switches or closer to the network elements, it eliminates additional connections and you can then get the fastest bandwidth and greater connectivity in the limited space. Most importantly, the 40G QSFP+ breakout patch panel simplifies your high performance cable routing in a finished, professional manner and provides increased cable capacity in less rack space. It is really a high-density cable management solution.

Conclusion

As network technology migrates from 10GbE to 40GbE and beyond, it is often necessary to connect 40GbE equipment with existing 10GbE equipment. MTP to 4x LC harness cable is a good option for connecting high speed switches populated with higher rate transceivers QSFP+, CFP CXP, CFP2, etc. to existing 10GbE elements populated with SFP+ modules. And 40G QSFP+ breakout patch panel can make your 10G to 40G cabling more efficient to manage. These two high-density MTP components can provide cost-effective and simple high-density 10G to 40G breaking cabling solutions. And I hope this article can be helpful for you.

Talk About MPO Connector

As high-density cabling in data center has become a trend, network components characterized by saving space become popular among data center managers. There is a type of multi-fiber connector—MPO connector, which is now widely used around the world. MPO connector not only allows for more fiber ports per unit of rack space, but also satisfies the need of parallel optical interconnections for multi-fiber connection. This article is going to introduce the detailed information about MPO connector.

Structure of MPO Connector

Each MPO connector has a key on one side of the connector body. When the key sits on top, this is referred to as the key up position. On the contrary, when the key sits on bottom, we call it key down position. Each of the fiber holes in the connector is numbered in sequence from left to right, and we call these fiber holes as positions, or P1, P2, etc. Besides, as shown in the following figure, there is a white dot on the connector body to designate the position 1 side of the connector when it is plugged in. Generally, MPO connector is pin and socket connector, which requires a male side and a female side. From the figure below we can find that MPO male connector has pins, while MPO female connector has no pins.

MPO Connector Types

Originally designed for ribbon fiber, MPO connector is available in 12, 24, 48 and 72 fiber variants. Generally, there are two popular MPO connector types: 12 fiber MPO connector and 24 fiber MPO connector. The following part will introduce these two types of MPO connectors to you.

12 Fiber MPO Connector

In theory, the 12 fiber MPO connector can deliver 6x10G transmit fibers and 6x10G receive fibers. However, it actually only delivers 40G since the transceivers and the equipment are only capable of supporting 40G data rates. That means 33% fibers of the connector are not being used, only 8 fibers are being used at the transceiver while the other 4 fibers are just spares. From the figure below, you can have a better understanding of this.

12 fiber MPO connector

Accommodating 12 fibers, the 12 fiber MPO connector provides up to 12 times the density, thereby it can save space in the rack. It is the first connector which has enough repeatable performance to be accepted in data centers. If you build a backbone with a 12 fiber MPO connector, basically you can put any connection on the end to be future proofed, such as LC, SC, etc. Thus most of data centers choose 12 fiber MPO connector cabling in the backbone and MPO-LC harnesses cable connecting to equipment like switches and servers. Many equipment today still has LC transceiver interface, therefore the harness is required to convert from MPO in the backbone to LC at the port.

24 Fiber MPO Connector

With development of data centers, many data center managers come across the problem that the promoted 12 fiber MPO connector no longer matches the requirement of the data centers. Every equipment applied in the data center is either 40G (8 fibers) or 100G (24 fibers). 12 is not divisible by 8, but 24 is. If you combine 2×12 fiber MPO connectors in the backbone, you can connect 3×8 fiber MPO connectors with zero fiber waste at the switch. The 24 fiber MPO connector has similar performance to the 12 if not exactly the same.

24 fiber MPO connector

As shown in the above figure, the 24 fiber MPO connector has two rows of 12 fibers. And this additional row of fibers require an increase in the spring force to push all of those fibers together, actually double what you need for 12. With the same size as a 12 fiber MPO connector, the 24 fiber MPO connector has double the amount of fibers and reduces the amount of cable required at the back end because a 24 fiber cable is only marginally bigger than a 12 fiber cable. Moreover, when you can just have 1×24 fiber MPO connector converting to 3×8, there is no need to combine 2×12 fiber MPO connectors to make 3×8. The 24 fiber MPO connector can also satisfy the demand for 100G data rates over a single connector and 20 fibers are used for 100G (10x transmit and 10x receive).

Conclusion

MPO connector delivers the optical, mechanical and environmental performance that service providers need to expedite the addition of fiber capacity and to support higher data-rate services. It plays an important role in the high-density cabling solutions. I hope after reading this article, you can have in-depth understanding of MPO connector.

Difference Between 40G QSFP+ Transceiver with LC Interface and MTP/MPO Interface

Data transmission with higher density and bandwidth has become the trend under present networking environment. With 40 Gigabit Ethernet commonly deployed in most data centers, various network devices designed for 40 Gigabit Ethernet (GbE) link are available on the market. Among them, 40G QSFP+ transceivers play an important role in driving the bandwidth to a mounting point. There are mainly two interfaces adopted by 40G QSFP+ transceivers—MTP/MPO and LC. What is the difference between these two interface types? This article will have an analysis of the 40G QSFP+ transceivers with LC interface and 40G QSFP+ transceivers with MTP/MPO interface.

40G QSFP+ transceiver with MTP and LC interface

40G QSFP+ Transceivers With LC Interface

From the figure below, we can easily understand the working principle of 40G QSFP+ transceivers with LC interface. In the transmit side, 4 channels of 10G serial data streams at different wavelengths are passed to laser drivers. The laser drivers control directly modulated lasers (DML) with wavelengths. Then the output of the four DMLs are optically multiplexed to a SMF through an industry-standard LC connector, combining as 40G optical signal. In the receive side, the 40G optical signal is demultiplexed into four individual 10G optical data streams at different wavelength. And each wavelength light is collected by a discrete photo diode and amplified by a TIA, and then outputted as electric data. In this process, a 4-wavelength CWDM multiplexer and demultiplexer is used over a pair of single-mode fibers. For transmission distance of this type of 40G QSFP+ transceiver, take 40G LR4 QSFP+ transceiver as an example, it can support an optical link length up to 10 kilometers over the single mode fiber.

40G QSFP+ transceiver LC interface working principle

40G QSFP+ Transceivers With MTP/MPO Interface

We can easily understand the working principle of 40G QSFP+ transceiver with MTP/MPO interface from the figure below. In the transmit side, the transmitter converts parallel electrical input signals into parallel optical signals through the use of a laser array. Then the parallel optical signals are transmitted parallelly through the multimode fiber ribbon terminated with MPO/MTP fiber optic connector. In the receive side, the receiver converts parallel optical input signals via a photo detector array into parallel electrical output signals. Generally, 40G QSFP+ transceivers with MTP/MPO interface are utilized for short distance transmission over multimode fiber (MMF), like 40G SR4 QSFP+ transceiver, it can support a link length up to 100 meters on OM3 cable and 150 meters on OM4 cable.

40G QSFP+ transceiver with MTP MPO interface working principle

Note: there are also some 40G QSFP+ transceivers with MTP/MPO interface supporting long distance transmission over SMF. For example, 40G LR4 PSM QSFP+ transceiver, a parallel single-mode optical transceiver with an MTP/MPO fiber ribbon connector, it offers four independent transmit and receive channels, each capable of 10G operation for an aggregate data rate of 40G over SMF. That is to say, eight single-mode fibers are used to achieve parallel transmission, with transmission distance up to 10 kilometers. From the perspective of cost, this kind of 40G QSFP+ transceivers cost more than 40G QSFP+ transceivers with LC interface. Besides, in the data center fiber infrastructure, MTP patch panel has to be used to accommodate MTP cables, which would cost more than LC connectors and regular SMF cables.

4x10G Connectivity

For the 40G QSFP+ transceivers with LC interface, they cannot be split into 4x10G as they use 4 wavelengths on a pair of single-mode fibers and do not lend themselves to “splitting” into 4 pairs without substantial complexity to split out the wavelengths. For the 40G QSFP+ transceivers with MTP/MPO interface, they can be used in 4x10G connectivity via an external 12-fiber parallel to 2-fiber duplex breakout cable, which connects the 40G module to four 10G optical interfaces.

Conclusion

Generally speaking, the 40G QSFP+ transceivers with LC interface are used for long distance transmission over single-mode fiber (SMF), and 40G QSFP+ transceivers with MTP/MPO interface are utilized for short distance transmission over multimode fiber (MMF). However, for some 40G QSFP+ transceivers with MTP/MPO interface, such as 40GBASE-LR4 PSM QSFP+ transceiver, it can support long distance transmission over SMF. Besides the examples discussed above, there are some other types of 40G QSFP+ transceivers provided by FS.COM, such as 40GBASE-CSR4 QSFP+, 40GBASE-PLR4 QSFP+, 40GBASE-ER4 QSFP+ and so on. If you want to know more details, please visit our site.