#QSFP28 Breakout DAC Cable

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Data Center Cabling Solution: Active Optical Cable

As data rates rise and data center grows in size, copper cable is getting stretched to its limits. However,  active optical cable (AOC) has emerged to replace copper cable in data centers and high-performance computing (HPC) applications. It provides high-speed, high reliability, high flexibility, and low power consumption. This article will provide some knowledge of AOC cable. 

What is an Active Optical Cable?

Active optical cable (AOC) is an optical fiber jumper cable terminated with optical transceivers on both ends. It uses electrical-to-optical conversion on the cable ends to improve the speed and distance performance of the cable without sacrificing compatibility with standard electrical interfaces.

Active Optical Cable Structure

AOC cable consists of the fiber optic connector and fiber cable. The connection between fiber cable and fiber optic connectors is not separable. If the fiber optic connector or fiber cable needs to be changed, they should be removed together. The electrical and optical signal conversion can be achieved right through each end of the optical fiber.

Active Optical Cable Types

There are several varieties of AOC cable available on the market , including 10G SFP+ AOC, 25G SFP28 AOC,40G QSFP+ AOC, 56G QSFP+ AOC, 40G QSFP+ to 4x SFP+ breakout AOC, 40G QSFP+ to 8x LC breakout AOC, 100G QSFP28 AOC, 100G QSFP28 to 4x SFP28 breakout AOC and 120G CXP AOC, etc. These AOC cables are commonly used for short-range multi-lane data communication and interconnect applications between two devices, such as rack-to-rack, shelf-to-shelf interconnect, storage, hubs, switches, routers, servers, etc.

Features and Benefits

AOC cable provides low power consumption, high density, high speed, high reliability, high security, small size, strong heat dissipation, low electromagnetic interference, long transmission distance, low energy consumption, low latency, lightweight, and ease of installation.

Application Scenarios

AOC Cable is used to connect top-of-row (ToR) switches to end-of-row aggregation switches, and to connect the ToR switch with storage subsystems at reaches greater than direct attach copper (DAC) limits of 3-7 meters. The following three scenarios show the specific applications.

Scenario 1:  AOC cable is used to connect two switches directly.

Scenario 2: The breakout AOC cable provides a highly cost-effective way to connect within racks and across adjacent racks. The following figure shows 40GbE QSFP+ to 4 x SFP+ AOC cable connecting to a 40G QSFP+ port switch on one end, and to four 10G SFP+ port switches on the other end.

Scenario 3: For the long-haul transmission between the two switches, a suitable solution is recommended to use single-mode patch cable, OEO converters, and AOC cables, which can provide seamless integration of different fiber types by converting multi-mode fiber to single-mode fiber.

Conclusion

AOC cable achieves high data rates over long reaches interconnection, which is the best solution for data centers and high-performance computing applications. Sun Telecom specializes in providing one-stop total fiber optic solutions for all fiber optic application industries worldwide. Contact us if any needs.

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Looking for the DAC Kabel at the best prices?

Go to Gbic-shop.de to get the high-quality DAC Kabel at the best prices online easily.

                                       https://www.gbic-shop.de/

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25G Switch Comparison: How to Choose the Suitable One?

Driven by the undeniable growth in demand for bandwidth of private and public cloud data centers, 25G Ethernet over a single lane has become the new trend for sever-to-switch interconnections. And the increasing requirements of higher speeds in data centers have enhanced the adoption of 25G switch, which is the new buzz in recent years. In this post, a simple analysis of 25G switch market and comparison of commonly used 25G switches will be explored.

25G Switch Market Analysis

As we know, before 25G technology advent, the existing options are one lane for 10G, four lanes for 40G, or four lanes at 25Gbps for 100G. The 25G technology meets the specification for existing module form factors like SFP28 and QSFP28, and allows for a breakout connection between 25G and 100G without changing the port on the front of many 100G switches. Besides, driven by the high speed and bandwidth, various switch manufacturers have announced their new 25G switches in recent three years, just to occupy more market shares.

Cisco delivered their Nexus 9300-FX platform switches for 10G/25G/100G switching;

Mellanox launched 25G Ethernet switch SN2410 series for 25G/50G/100G Ethernet networks;

Dell put forward EMC networking S-series 25/40/50/100GbE to help data centers migration;

Broadcom announced its BCM56960 Series 25G switch for cloud-scale networking;

FS.COM introduced N-Series spine/leaf 25G/100G switch for cost-effective data center solutions.

At the same time, 25G optical transceivers, DACs, and AOCs also spring up like mushrooms. According to a study by Dell’oro, Ethernet switch revenue will continue to grow through the end of the decade, with the biggest sales forecast for 25G and 100G ports.

Notes: the source of the research: Crehan research.Inc

From the research we can see, at least in the next three years, 25G/50G/100G bandwidth will continue to grow and occupy half of the total network bandwidth, which in turn enhances the development of 25G switch market. Though challenges still exist for 25G Ethernet, it’s not denied that the trend for ToR 25G switches cannot be blocked.

Comparison Between Commonly Used 25G Switches in the Market

As have mentioned above, 25G switch market is booming due to the growing speed and bandwidth as well as switch vendors promotion. Then how to achieve the optimized network performance with existing 25G Ethernet switches, and control the total investment at the same time? Firstly, let’s have a look at the 25G switches in the market.

All the 25G SFP28 switches listed in the table have the same port configuration: 48 SFP28 ports and 6 QSFP28 uplink ports. And there are ToR/Leaf switches. Usually 25G switch is often used for switch-to-server applications, as for how to realize this, please read the article: How to Use 25G Switch for Switch-to-Server Connection.

For choosing ToR 25G switch, if you have no limited cost budget, Cisco 25G switch maybe a not bad choice, because except for the expensive price, it has high-level performance and configuration as well as its good reputation. All these make Cisco switches are perfect for data centers. Of course, other 25G switch vendors like Dell, Brocade and Mellanox also provide good options for migration from 10G, 25G to 50G and 100G networks.

However, for those who have a tight budget or do not pursue brand, a more wise choices is to select 25G switch like FS.COM N8500-48B6C. This switch supports ONIE installer for 3rd party network operating systems and compatibility with SDN (Software Defined Networks) via OpenFlow 1.3.11. And it also supports the advanced hardware based VXLAN feature to support over 16M virtual networks, making it a suitable option for cost-effective data center solutions.

Summary

25G switch offers a more convenient way to migrate to 100G network. Because it reduces the numbers of cables and switches needed in network designs, which in turn decrease the CAPEX and OPEX. Facing with the fast evolving 25G switch market, are you ready for it?

[scarlett-fan-blog1]

25GbE Ethernet and 25GbE Products FAQs

25GbE Ethernet has been an eye-catching topic ever since its introduction in 2016. After its appearance, the upgrade path to 100G has a new option — 10G-25G-100G. Although 25G has already been released, it’s still a new thing for many people. Here collect some common questions which will help you to better know 25GbE Ethernet and 25GbE Products.

25GbE Ethernet FAQs

What is 25GbE Ethernet?

25GbE Ethernet is a standard for Ethernet connectivity that benefits cloud and enterprise data center environments. It uses technology defined for 100GbE Ethernet, which implemented as four 25 Gbit/s lanes running on four fibers or copper pairs.

25GbE VS 10GbE, which is better?

As data centers require faster speed and higher bandwidth, 10GbE is not fast enough for switch-server connections. 25GbE was proposed to provide 2.5 times the performance of 10GbE as well as offers higher bandwidth at the same power consumption. 25GbE Ethernet supports 10GbE technology advancements in packaging and silicon. All these benefits contribute the existing switch architectures to supporting link speeds faster than 10GbE without the need to add cable/trace interconnects. At the same time, the architectures can keep up with the growth of the network bandwidth and become faster and richer.

25GbE VS 40GbE, who is the winner?

Compared to 40GbE, 25GbE can provide a higher port density with maximum switch I/O performance and fabric capability, enabling the network bandwidth to be effectively scaled in cloud and web-scale data center environments. What’s more, the 25G-100G (4x25G lanes) networking migration path provides a lower cost per unit of bandwidth by fully utilizing switch port capabilities when compared to 40G-100G upgrade path.

What makes 25GbE a choice for next-generation switch-server connections?

25GbE technology has two major advantages. First, by offering a single-lane 25Gbps variant, 25GbE allows for optimization of the bandwidth available from switch-fabric design, which is typically viewed from a per-pin and therefore per-lane standpoint. Another major advantage is that it takes existing module form factors and optical plants factors, such as SFP28 and QSFP28, and allows for a breakout connection that is configurable as either 25GbE per lane or the full 100GbE without changing the port on the front of switches and the wholes physical infrastructure.

Will the upgrade path of 100GbE be 10G-25G-100G?

Before the 25GbE specification was released, the 10G-40G-100G upgrade path is predominantly adopted by data centers to upgrade to 100GbE. However, due to the appearance of 25GbE, the 10G-25G-100G upgrade path has gained more recognition by offering the cost per bit, power consumption and server rack density advantages. 25GbE provides another option for 100GbE upgrade, and its prospect is bright.

25GbE Products FAQs

What kinds of 25GbE products are on the market today?

Currently, 25GbE products on the market are relatively complete. These 25GbE switch, 25GbE NIC, 25GbE SFP28, 25GbE DAC/AOC cable are all available on the market.

What does SFP28 stand for?

SFP28 is the enhanced version of SFP+, designed for 25G signal transmission. It has the same physical structure as SFP and SFP+, but its electrical interface is upgraded to handle 25Gbps per lane. The pinouts of SFP28 and SFP+ connectors are compatible. Compared to SFP+ solution, SFP28 has higher bandwidth, superior impedance control, and less crosstalk. In addition, the SFP28 copper cable has greater bandwidth and lower loss than the SFP+ version.

Can SFP28 cables be plugged into SFP+ ports?

Yes. SFP28 is backward compatible with SFP+ ports and can work sufficiently. SFP+ cables can be plugged into SFP28 ports but they are not designed for 25Gb/s data rates.

Can 10G SFP+ and 1G SFP transceivers be plugged into the associated 25G SFP ports?

Yes. The associated 25G SFP ports can run multiple speeds and support 10G SFP+ and 1G SFP transceivers. However, some port level restrictions may occur during speed mixing and matching.

Are branded 25G transceivers interoperable with third-party 25G transceivers?

Yes. Third-party 25G transceivers are compliant with relevant industry standard specifications and can be fully interoperable as long as compatibility is guaranteed.

Where can customers buy split cables for 100G to 4x25G connectivity?

Large vendors can supply volumes of MTP-LC multimode fiber breakout cables to customers for 100G to 4x25G connectivity. FS also provides 100G QSFP28 to 4x25G SFP28 DAC/AOC cables for you to choose.

Summary

25GbE Ethernet is considered an incremental update of 10GbE Ethernet, which supports 100GbE Ethernet with single lane at 25Gbps. Due to the booming of 25GbE, data centers will gradually turn to 25GbE networks. Knowing the above information is essential for you to deploy 25GbE Ethernet networks and avoid some problems when purchasing 25GbE products. FS offers a wide variety of high-quality and cost-effective 25GbE Ethernet portfolios such as 25gbe switch, 25G NIC, 25G SFP28 transceiver, and 25G DAC/AOC cables to meet your needs of 25GbE devices and connectivity options.

Original Source:

http://www.fiber-optical-networking.com/25gbe-ethernet-and-25gbe-products-faqs.html

[cboitde]

BlueLAN© BL302801X2M26 2 Meter Direct Attach Breakout Cable (DAC) as passive 400 Gigabit to 4x 100 Gigabit Twinax copper type with OSFP to 4x QSFP28 connector, for linking hardware in racks and across adjacent racks. BlueLAN BL302801X2M26 2 Meter OSFP to 4x QSFP28 Direct Attach Breakout Cables are suitable for 400G Ethernet and InfiniBand applications and are available in various lengths.

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How Far Can 25G Ethernet Go?

Seeing from the evolution of data transmission speed and size of data centers, it is not difficult to find that the pressure on the data centers to manage data quality and transmission speed continues to grow, which leads to the need for faster data transmission over the network. Ethernet industry has laid a path to higher networking speeds like 100GbE, and 25G Ethernet has been developed to provide a simpler path to future Ethernet speeds of 50 Gbps, 100 Gbps and beyond. The release of the 25GbE specification provides cost-effective solution for server-to-switch connectivity. However, network will not stop the pace of development. How far can 25G Ethernet go? This article is going to focus on the question.

Overview of 25G Ethernet

25G Ethernet is a standard for Ethernet connectivity in a datacenter environment, developed by IEEE 802.3 task force P802.3by. The IEEE 802.3by standard uses technology defined for 100 Gigabit Ethernet implemented as four 25 Gbps lanes (IEEE 802.3bj). In 2016, 25G Ethernet equipment was available on the market, such as 25G SFP28 transceiver and DAC cable. In addition, 25G Ethernet supports for 100G using QSFP ports that can be converted to 4 lanes of 25 Gbps, like 100G QSFP28 transceiver. Here is a table of 25G Ethernet specification for you.

Advantages of 25G Ethernet

For 10G ToR to 10G Server connectivity, the simplest cabling solution is to use two 10G SFP+ transceivers and one fiber optic cable. When the network has to be upgraded to 25G Ethernet, the data center manager only needs to replace 10G SFP+ transceivers with 25G SFP28 transceivers. In the same way, we know that in 40G ToR to 10G Server connectivity, one 40G QSFP+ transceiver, four 10G SFP+ transceivers and one MTP to LC breakout cable are utilized. When this network deployment is upgraded to 100G ToR to 25G Server connectivity, the work can be quickly finished by replacing 40G QSFP+ transceiver with 100G QSFP28 transceiver, four 10G SFP+ transceivers with four 25G SFP28 transceivers. It can be easily found that there are some advantages when upgrading from 10G to 25G or 40G to 100G:

It can offer both CapEx and OpEx savings through backward compatibility, for investment protection and seamless migrations with consistent rack-design and reuse of the existing cabling infrastructure, avoiding costly and complex changes.

The technology utilized in 100G to 25G connectivity is similar to that in 40G to 10G connectivity, but the performance is increased by 2.5 times, thus reducing the power and cost per gigabit significantly.

25G Ethernet provides higher port and system density than a comparable 40G solution.

Both power savings and higher density results in lower cooling requirements and operational expenditure for data center operators.

How Far Can 25G Ethernet Go?

Considering the significant benefits and compelling economics of 25G Ethernet, it is no surprise that the move to 25GbE is accelerating—a recent five-year forecast by industry analysts at the Dell’Oro Group predicts 25G Ethernet will be the dominant Server port speed for new systems by 2018. You can learn about it from the following figure.

However, never underestimate the need for industry consensus building. At present, 25GbE is mainly used for switch-to-server applications. If it can realize switch-to-switch application, 25G Ethernet may go further.

Conclusion

To be frank, 25G Ethernet indeed gains ground in some aspects compared to 10G and 40G Ethernet. If you plan to deploy 25GbE network, you can visit FS.COM which provides quality 25G SFP28 transceiver and various fiber optic cables.

Originally published at: http://www.fiber-optical-networking.com/how-far-can-25g-ethernet-go.html

[fsjoanna-blog]

Compatible Optics for Juniper QFX5200-64Q Switch

Designed to meet advanced data forwarding and network monitoring needs, Juniper QFX5200 switches are ideally suited for leaf deployments in next-generation IP fabric networks. QFX5200-32C and QFX5200-64Q are two common switches among QFX5200 series, they are featured as extra low latency, high flexibility, cost-effective and high density. If you are looking for such a switch with more QSFP+ and QSFP28 ports, QFX5200-64Q is a good option. The detailed information about QFX5200-64Q will be fulled covered in this passage.

Overview on QFX5200-64Q

QFX5200-64Q offers 32ports of 100GbE or 64 ports of 40GbE, and delivering 3.2Tbps line-rate switching performance with latency as low as 500 ns. A QSFP28 module can be used for a 1×100GbE connection or 2×50GbE or 4×25GbE connections using breakout cables. A QSFP+ module can be used for a 1×40GbE connection or 4×10GbE connections using breakout cables. Both the two versions support 128 10GbE SFP+ through QSFP+ to SFP+ breakout cable and 128 25GbE SFP28 through QSFP28 to SFP28 breakout cable. The front view and main features of QFX5200-64Q are just in the below:

Flexible connectivity options The QFX5200 offers a choice of 10GbE, 25GbE, 40GbE, 50GbE, and 100GbE interface speeds for server and intra-fabric connectivity on both platforms, providing deployment versatility and investment protection.

High density configurations QFX5200 switches are optimized for high-density fabric deployments.

Rich automation capabilities The QFX5200 switches support Python, Chef, Puppet, and Zero Touch Provisioning (ZTP).

High availability Topology-independent in-service software upgrade (TISSU) and fast reboot ensure high network availability during a switch update.

Compatible Optical Transceivers for QFX5200-64Q

As we can see from the below table, there are many types of optical transceivers supporting QFX5200-64Q. For QSFP+ port, you can choose QFX-QSFP-40G SR4 and QFX-QSFP-40G LR4 for transferring data over short and long distance respectively. You can use QFX-QSFP-40G SR4 modules for short transmission distance on this switch. Just plug the QFX-QSFP-40G SR4 into the QSFP+ port on QFX5200-64Q, the signals can be arrived up to 150 m. If this transmission distance cannot meet your requirement, 40GBASE-LR4 QSFP+ is a perfect choice. Just press firmly with your thumb and push the 40GBASE-LR4 QSFP+ transceiver gently to the transceiver socket on the switch, the maximum transmission distance on this switch can be up to 10 km.

For QSFP28 ports, you can also use JNP-QSFP-100G-SR4 and JNP-QSFP-100G-LR4 for short and long haul transmission. Using QSFP28 Juniper JNP-QSFP-100G-SR4 compatible transceiver on the QFX5200-64Q switch, the information can be transmitted over 100 m. By plugging the 100G QSFP28 LR4 module into the QSFP+ ports on the switch, the signals can be transmitted as far as 10 km. All of the modules in the above table are 100% tested, they are fully compatible to the QFX5200-64Q.

Compatible DAC Cables for QFX5200-64Q

From the above statement, we are clear that the Juniper QFX5200-64Q switch has 64 QSFP+ ports, so you can directly connect the two ends of the DAC cable to the corresponding port on the switch. The following table shows the detailed information about compatible DAC cables for QFX5200-64Q. For transmission distance over short distance, you can choose 40G QSFP+ DAC cables to make network connectivity. By using 40G breakout cable, you can just plug the one end of 40G QSFP+ copper direct attach cable into the 40G QSFP+ ports and plug the other ends of the DAC cable into four 10G SFP+ ports.

Besides, you can also connect the two ends of 40G DAC cable with the 40G QSFP+ ports directly to make connectivity on the Juniper QFX5200-64Q switch. When the transmission distance is longer, 40G QSFP+ AOC cable is a good option to transfer data. Like the 40G QSFP+ DAC cable, you can plug the two ends of 40G QSFP+ AOC cable into the QSFP+ ports on the Juniper QFX5200-64Q switch. Those 40G QSFP+ DAC and AOC cables are suitable for short distance and ideal for high cost-effective connectivity to your Juniper QFX5200-64Q switch.

Conclusion

The Juniper QFX5200-64Q switch offers flexible, cost effective, high-density 10GbE, 40GbE and 100GbE interfaces for server and intra-fabric connectivity, providing deployment versatility, investment protection, and future protection for today’s data centers. If you are looking for the compatible optics for the QFX5200-64Q switch, FS.COM is a great choice. Here, we offer large and in-stock compatible optic modules and DAC cables for the switch with high quality but low cost. If you are interested with our products, please feel free to contact us.

[katherinewangfs-blog]

Things You Should Know to Deploy 100G Ethernet Network

Although the 10G and 40G Ethernet network still occupy the majority of fiber market at present, it is predicted that more and more users would deploy 100G Ethernet network in the following years for higher capacity and faster transmission data rate, and the 100G cabling network would finally make the 10G and 40G cabling network obsolete. Is there any evidence to support this prediction? Why to replace 10G and 40G cabling network and how to deploy the 100G cabling network? Does this statement take the cost issue into consideration since the 100G products like QSFP28 transceiver and QSFP28 breakout cable are much more expensive than the 10G and 40G products? Let’s talk about these topics and find the most cost effective way to deploy the 100G cabling network.

Why We Deploy 100G Cabling Network?

With the fast development of fiber technology, the capacity and transmission data rate that the 10G and 40G networks offer gradually can’t meet our needs and the Ethernet network is still driven to satisfy the increasing requirements of faster and easier access to larger volumes of data. Under this trend, the 100G network is come up with that enables unsurpassed bandwidth but can be only available at a high price. As the 100G technology is gradually matured, the cost for 100G network deployment is reduced a lot. Hence, more and more users would like to deploy the 100G network for bigger bandwidth, even it would still cost higher than 10G and 40G network deployment.

Which Transceiver Is the Best for Deploying 100G Network?

Before designing the 100G cabling network, we should choose the most proper 100G fiber transceiver to greatly ensure the performance of the network. Since there are four common kinds of 100G fiber transceivers–CFP, CFP2, CFP4 and QSFP28 transceiver available on the market, let’s study the basic knowledge of these 100G transceivers and discuss which one is the best choice for the 100G network deployment.

CFP transceiver is the first version of 100G transceiver which is published after the establishment of certification for the first 100G standard for Ethernet networks. The letter “C” means 100G, while the letters “FP” stand for Form factor Pluggable, just like the “FP” in the word SFP. In order to support the 100G network, it features very huge size which is much larger than 40G QSFP+ transceiver. Meanwhile, most of the CFP transceivers double the power consumption per bit and are ten times more expensive for per bit increased. All these shortcomings hinder the popularity of CFP transceiver and make the CFP2 and CFP4 transceiver published successively.

The CFP2 and CFP4 transceiver has no any improvement in the aspects like density, power consumption and cost, but be only advanced in the size aspect. From the following figure, you can learn that the size of the CFP family become more and more smaller. However, due to the high power consumption and cost, using CFP family to deploy 100G network still can’t meet the network requirement. Under this condition, experts put forward the QSFP28 transceiver solution which is much smaller and more economic than CFP family.

In contrast to the CFP family, QSFP28 transceiver is a better choice that offers four 25-Gbps lanes, totally achieving the whole 100G network. With use of this kind of 100G transceiver, the 100G network can be deployed as easy as the 10G and 40G network. Moreover, it completely eliminates the costly gearbox found in CFP and CFP2, while highly increasing density and decreasing power and price per bit. Hence, among all the 100G transceivers, the QSFP28 transceiver is the first choice for deploying 100G network, which should be considered as the most economical transceiver solution.

Which 100G Cabling Solution Should Be Selected?

After choosing the best 100G transceiver solution, it is also necessary to design the 100G cabling network. At present, there are basically two 100G cabling solutions. One is the direct cabling solution usually working with the QSFP28 cable, and the other is the breakout cabling solution that always uses the QSFP28 breakout cable. Considering that each solution has its own connection method and works with different fiber or copper cable, which one should be selected depends on the practical application.

As for the 100G direct cabling solution, it always uses the 100GBase-SR4 QSFP28 transceiver to finish short distance transmission, and 100GBASE-LR4 QSFP28 transceiver for long transmission. In short transmission case, the 100GBase-SR4 QSFP28 transceiver can support the 100G network through OM3 12 fiber multimode MTP cable at lengths up to 70 m, and 100 m through OM4 12 fiber multimode MTP cable. It can also work with the 100G QSFP28 to QSFP28 passive direct attach cable (DAC) for up to 5m transmission and with the 100G QSFP28 to QSFP28 active direct attach cable (AOC) for up to 10m transmission. While in the long transmission case, 100GBASE-LR4 QSFP28 transceiver enables the 100G network up to 10 km on single-mode LC patch cable. If much longer transmission distance is required, you are highly suggested to choose the 100GBASE-ER4 CFP transceiver that can transmit the 100G signal at lengths up to 40 km.

As for the breakout cabling solution, the connection method is very different from the previous one, which usually use the QSFP28 breakout cable to connect one QSFP28 transceiver on one side and four SFP28 transceivers on the opposite side. This kind of 100G cabling solution enables higher port bandwidth, density and configurability at a low cost and reduces power consumption in data centers. Besides, the QSFP28 breakout cables used for 100G breakout cabling can be simply divided into two types, QSFP28 to 4SFP28 DACs and AOCs. Both of the two kinds of QSFP28 breakout cables feature four individual 25G duplex cables to achieve 100G connections, similar to the 40G QSFP+ breakout cable that has four individual 10G duplex cables.

Conclusion

With the gradual mature of 100G Ethernet technology, the cost issue is not the obstacle for the popularization of 100G Ethernet network any more. If your network has a very low transmission speed and the capacity it offers can’t face your need, then you are recommendable to upgrade your network from 10G/40G to 100G, for faster and easier access to larger volumes of data. As for the transceiver used for 100G connection, the QSFP28 is the fist choice as the most cost effective solution at present. As for the 100G network cabling, the direct cabling for 100G to 100G connection and the breakout cabling for 100G to 4×25G connection are good solutions for 100G network deployment. Which one should be selected just depends on the practical application.

Originally source: http://www.chinacablesbuy.com

[fiberbilby]

Do You Know About 100G QSFP28 DAC Cable?

The 100GBASE-QSFP28 is designed to carry 100 Gigabit Ethernet. This transceiver type is also used with direct-attach breakout cables to adapt a single 100GbE port to four independent 25 gigabit Ethernet ports (QSFP28-to-4x-SFP28). The QSFP28 transceiver is a high-density, high speed product solution designed for applications in the communications, data center and networking markets. How about the 100GBASE QSFP28 cables? The 100GBASE-QSFP28 is fully covered with 100GBASE DAC twinax cables.

Types of 100G QSFP28 DAC Cable

In the most common places, 100GBASE DAC cables are generally divided into two types. One type is that the two ends of the cable are all 100G QSFP28 connectors. That is, QSFP28 to QSFP28 100G Passive DAC Cable. Another type is that one end is a 100G connector while the other end is four 25G SFP28 connectors. That is 100G QSFP28 to 4×25G SFP28 Fan-out Passive DAC Cable. The detail information of this two kinds of 100G QSFP28 cables will be provided in the following text.

QSFP28 to QSFP28 100G Passive DAC Cable

100G QSFP28 DAC is a 4-channel parallel passive copper cable that is combining four 28 Gbps SFP channels into one high-density cable. It offers 4 independent data transmitting channels and 4 data receiving channels via copper cable. An aggregate data rate of 100Gbps over 5 meters transmission can be achieved by this 100G DAC cable.

This one-meter copper cable integrates a 100G Ethernet-optimized (100 GbE) 38-position “board-as-connector” design with zinc die-cast male QSFP+ connectors for superior EMI resistance, minimal insertion loss and low crosstalk for better performance. Ergonomic at pull-tab ejectors make connecting to equipment a quick, easy task. Eight-pair wire technology is optimized for bandwidth-intense applications, including 100-Gigabit Ethernet (1000GBASE-CR40, 128G Fibre Channel and EDR 4× InfiniBand. Flexible 26 AWG conductors maintain a smooth high-frequency response.

QSFP28 to QSFP28 100G Passive DAC Cable is fully compliant with the MSA (Multi-Source Agreement) SFF-8665 for guaranteed compatibility with all QSFP and QSFP+ posts as well as IEEE 802.3bj. It is ideal for connecting active network equipment in data centers, high-end servers and enterprise wiring closets.

100G QSFP28 to 4×25G SFP28 Fan-out Passive DAC Cable

100G QSFP28 to 4×25G SFP28 application is commonly known as a “fan-out’ assembly which is a hybrid transition from a QSFP28 on one end to four individual SFP28 on the other end. Fan-out cable, also called breakout cable, made of several simplex cables bundled together inside a common jacket. The 100G QSFP28 to 4×25G SFP28 fan-out DAC offers four parallel, bi-directional channels each operating at up to 25.78125 Gps. The copper link length is up to 4 m.

100G QSFP28 to 4×25 SFP28 breakout DAC cable has many benefits, such as low crosstalk, small bend radius and lower total system power. This kind of cable offers precision external cable assembly solutions. They meet the ever increasing demand for higher channel density with high-level signal integrity in high performance computing, top-of-rack switching, and network storage deployments. QSFP28 to 4×SFP28 breakout DAC cable supports 100G to 4×25G Ethernet interoperability with simplified cable installation. And thus, it is available to many applications, such as 100G Ethernet transmission, Infiniband, servers, switches, storage and host card adapters for Data center interconnect, and high-performance computing clusters.

Summary

QSFP28 to QSFP28 100G passive DAC cable and 100G QSFP28 to 4×25G SFP28 fan-out passive DAC cable are two commonly types of 100G QSFP28. You can choose an appropriate one based on your own need. If you are in the absence of one-one port cable, QSFP28 to QSFP28 100G passive DAC cable will be nice. When the one-four ports are required, and then 100G QSFP28 to 4×25G SFP28 fan-out passive DAC cable is highly recommended.

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25GBASE SFP28 DAC Cables

SFP28 cable, also known as SFP28 DAC (Direct Attach Copper ) Twinax cable or SFP28 AOC (Active Optical Cable) cable, is a form of a high-speed cable with SFP28 connector on either end. It features with lower power consumption and lower interconnection loss, which makes it suitable for TOR (Top-of Rack) switch to server connectivity.

The SFP28 cable can be classified to 25G SFP28 DAC cable and 25G SFP28 AOC cable. And they are all present to be the most economical choice for TOR 25GBASE switch connections. Here we will explain each cable one by one.

25G SFP28 DAC Cable

SFP28 DAC is a form of a shielded high-speed SFP28 cable with pluggable transceivers on either end. Generally, there are two popular types of SFP28 DACs on the market, 25G SFP28 to SFP28 DAC and 100G QSFP28 to 4 SFP28 DAC. 25G SFP28 to SFP28 DAC cable is usually a passive cable on the market. It has no signal amplification in the cable assembly, so it’s often used for ultra short reach (≤5m). 100G QSFP28 to 4 SFP28 DAC uses breakout cables connect to a 100G QSFP28 port switch on one end and four 25G SFP28 ports switch on the other end, making it a highly cost-effective way to achieve short distance. Normally 25G SFP28 DAC can be used to the interconnection of switches, routers, storage devices, and servers.

                                                                                                                           25G SFP28 AOC Cable

SFP28 AOC has a similar appearance as SFP28 copper cable, but its transmission method and application environment are not the same. There are two types of SFP28 AOCs on the market, 25G SFP28 to SFP28 AOC and 100G QSFP28 to QSFP28 AOC. SFP28 AOC uses electrical-to-optical conversion on the cable ends to improve speed and distance performance of the cable. Compared to the SFP28 copper cable, SFP28 AOC usually has a longer transmission distance and better transmission performance. Compared with the optical transceiver module, it does not have the problem of the interface being contaminated, which greatly improves the stability and reliability of the system and reduces the management costs of the server room. SFP28 AOC cable is the ideal cable for the connection between rack and rack on a data center, which is generally optimized for lengths.

 Features and benefits of Cisco 25G Modules

●     Interoperable with other IEEE-compliant 25G interfaces where applicable

●     Certified and tested on Cisco SFP28 ports for superior performance, quality, and reliability

●     High-speed connectivity compliant to IEEE 802.3by and IEEE 802.3cc

The development of 25G SFP28 cable connections has provided a wide range of benefits, especially in a web-scale data center environment. Primarily, SFP28 cable is suitable for short-distance cabling of a network solution, which has a scientific layout design to save space with more reasonable length. It can efficiently utilize data and switch port density. Moreover, SFP28 cable provides an extremely efficient increase in speed to the server to TOR, especially when using the DAC assembly. It also simplifies the development of interoperability specifications and systems due to the fact that it is backward compatible and gives an easier upgrade path from an existing 10G TOR server configuration. Furthermore, using 25G SFP28 cables for TOR servers are more economical. This is because SFP28 cable can provide higher port densities, fewer TOR switches and cables are needed. It allows a more cost-effective alternative TOR server connection that connects via point-to-point links. It also enables EOR (End of Row) or MOR (Middle of Row) by using structured cabling.

 Additional information

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SFP28 Cable: Why Choose It?

Over the years, our demand for communication bandwidth requirements has increased dramatically. Communication service providers, public or private data centers require higher speed and bandwidth connections. At this time, a new Ethernet connectivity standard, 25 Gigabit Ethernet was proposed. The release of the 25G Ethernet standard has provided a new path for data center server connections. This article will discuss 25G SFP28 cable and why you should choose it.

What Is SFP28 Cable?

SFP28 cable, also known as SFP28 DAC (Direct Attach Copper ) Twinax cable or SFP28 AOC (Active Optical Cable) cable, is a form of a high-speed cable with SFP28 connector on either end. It features with lower power consumption and lower interconnection loss, which makes it suitable for TOR (Top-of Rack) switch to server connectivity.

How Many Types of SFP28 Cable？

The SFP28 cable can be classified to 25G SFP28 DAC cable and 25G SFP28 AOC cable. And they are all present to be the most economical choice for TOR 25gbe switch connections. Here we will explain each cable one by one.

25G SFP28 DAC Cable

SFP28 DAC is a form of a shielded high-speed SFP28 cable with pluggable transceivers on either end. Generally, there are two popular types of SFP28 DACs on the market, 25G SFP28 to SFP28 DAC and 100G QSFP28 to 4 SFP28 DAC. 25G SFP28 to SFP28 DAC cable is usually a passive cable on the market. It has no signal amplification in the cable assembly, so it’s often used for ultra short reach (≤5m). 100G QSFP28 to 4 SFP28 DAC uses breakout cables connect to a 100G QSFP28 port switch on one end and four 25G SFP28 ports switch on the other end, making it a highly cost-effective way to achieve short distance. Normally 25G SFP28 DAC can be used to the interconnection of switches, routers, storage devices, and servers.

25G SFP28 AOC Cable

SFP28 AOC has a similar appearance as SFP28 copper cable, but its transmission method and application environment are not the same. There are two types of SFP28 AOCs on the market, 25G SFP28 to SFP28 AOC and 100G QSFP28 to QSFP28 AOC. SFP28 AOC uses electrical-to-optical conversion on the cable ends to improve speed and distance performance of the cable. Compared to the SFP28 copper cable, SFP28 AOC usually has a longer transmission distance and better transmission performance. Compared with the optical transceiver module, it does not have the problem of the interface being contaminated, which greatly improves the stability and reliability of the system and reduces the management costs of the server room. SFP28 AOC cable is the ideal cable for the connection between rack and rack on a data center, which is generally optimized for lengths.

Benefits of 25G SFP28 Cable Connections

The development of 25G SFP28 cable connections has provided a wide range of benefits, especially in a web-scale data center environment. Primarily, SFP28 cable is suitable for short-distance cabling of a network solution, which has a scientific layout design to save space with more reasonable length. It can efficiently utilize data and switch port density. Moreover, SFP28 cable provides an extremely efficient increase in speed to the server to TOR, especially when using the DAC assembly. It also simplifies the development of interoperability specifications and systems due to the fact that it is backward compatible and gives an easier upgrade path from an existing 10G TOR server configuration. Furthermore, using 25G SFP28 cables for TOR servers are more economical. This is because SFP28 cable can provide higher port densities, fewer TOR switches and cables are needed. It allows a more cost-effective alternative TOR server connection that connects via point-to-point links. It also enables EOR (End of Row) or MOR (Middle of Row) by using structured cabling.

The Future of SFP28 Cable Connections

25G SFP28 cable solutions feature a lower power consumption and smaller footprint requirement for data centers. Due to the benefits provided by 25G SFP28 cable assembly, it is expected that it will be popular in the years to come. It is believed that the dominant next-generation server connection is towards the 25Gbps speed in the server. And in the near future, more devices will use the 25G SFP28 DAC or AOC cable assembly solutions. FS.COM offers a variety of SFP28 DAC/AOC options, such as SFP-H25G-CU3M, SFP28-25G-AOC1M and so on. You can have a visit and choose the products you need.

Original Source:

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Advantages and Disadvantages of Direct Attach Twinax Cable

Driven by need for high speed Ethernet and increasing services like Cloud and virtual data center, many data centers have been loaded with numerous cables and various equipment. Due to this case, shortage of data center space is common but it’s getting difficult and expensive to build new or expand existing locations. Today this post intends to introduce a type of cable—direct attach twinax cable, which can solve this problem effectively.

Overview of DAC

Direct attach twinax cable is a type of copper cable similar to coaxial cable, but it has SFP+, QSFP+ or QSFP28 plus at each end integrated. DACs are usually used in data centers for short transmission between racks. Generally, according to the construction differences, the DAC comes in two types: passive DAC and active DAC. Passive DAC are suitable for short distances up to 10 m and active DAC has a little longer transmission distance up to 15m at 10Gbps or 40Gbps, because it has an active component to boost/receive signal. And passive DACs require no power for internal electronics, which avoid consuming power or produce heat. While active DAC comes in reverse, it needs power to make its internal circuits work properly.

On today’s markets, in order to satisfy the ever growing need for cost-effective delivery of more bandwidth, there are mainly three kinds of DAC according to the transmission rate: 10G SFP+ DAC, 40G QSFP+ DAC and 100G QSFP28 DAC.

10G SFP+ DAC offers the high density, low cost and low power solutions for today’s 10G Gigabit Ethernet connections. With its SFP+ interface, this twinax cable allows interconnects with hot-pluggable optical transceivers and Ethernet switches in data centers. As shown in the picture below, two Cisco catalyst switches are connected with a 10G SFP+ DAC.

40G QSFP+ DAC offers a way for 40G Gigabit short distance connections between QSFP ports switches. As its name shows, 40G QSFP+ DAC has QSFP+ connectors on both ends. And it uses integrated duplex serial data links for bidirectional communication. 40G QSFP+ DAC is a little different from 10G SFP+ DAC. Because it has another two breakout forms: 40G QSFP+ to 4XSFP+ DAC and 40G QSFP+ to 4xXFP DAC. These breakout DACs can be used to migrate from 10G to 40G.

The last one is 100G QSFP28 DAC. The 100G QSFP28 DACs are high speed cable to meet and exceed 100G Gigabit Ethernet, providing connectivity between devices using QSFP28 ports. The 100G QSFP28 DAC includes QSFP28 to QSFP28 and QSFP28 to 4xSFP28 breakout DAC. These interconnect cables provide four channels of high speed differential signals with data rates ranging from 25Gbps up to potentially 40Gbps.

Advantages and Disadvantages of DAC 

DACs come into play in data centers mainly because of two factors which also show its superiority. We all know that denser equipment in the data center or server rooms will consume more electrical power and produce more heat. That means more cooling systems are required. However, DACs have the potential to reduce the overall power consumption and heat dissipation, which help network operators save cost. Another factor is that DACs are robust and do not need patch panels or additional cables when connected to devices, as is the case with an optical module. The modules on both ends make them sturdy and reliable as well as space-saving.

Nothing can be perfect, so do the DACs. Although they can save space and cost for data center managers, the drawbacks still exist. As the mainly element of DACs is copper, it is heavy and bulky, causing difficulties for management. What’s more, if DACs are deployed in high volume, the cable diameter and cable stiffness are another problem that should be considered. In this case, active optical cables (AOCs) seem to be a better choice, for they are made of thinner and more pliable optical cable.

Summary

DACs provide a low power consumption and high-speed solution for data center interconnections. With the ability to support data rate of 10G, 40G and 100G, they are now widely used in optical links. All the DACs mentioned above are supplied in FS.COM. If you need to know more details, please visit www.fs.com or directly contact us via sales@fs.com.

Sources:http://www.fiber-optic-components.com/advantages-and-disadvantages-of-direct-attach-twinax-cable.html