Browsed by
Tag: data center

What’s the Difference Between 100G CLR4 and CWDM4?

What’s the Difference Between 100G CLR4 and CWDM4?

Since the existing 100G Ethernet links with QSFP28 SR4 or LR4 are either too short or too expensive, 100G modules that can cover this enormous middle ground between 100m and 10km are expected to come to the market. 100G CLR4 and CWDM4 are two types of 100G interface to deliver distance up to 2km over duplex single-mode fiber. As CLR4 and CWDM4 are similar, so what’s the difference between them?

CLR4 Alliance

100G CLR4 is a new, open, multi-vendor 100G optics specification created by 100G CLR4 Alliance who consists of end-customers, system companies, and optical companies. It is a low-power, cost-effective, 100G-CWDM solution that routes four 25Gbps optical transmissions down a single-mode fiber for reaches of up to 2km. CLR4 Alliance is designed to address market requirements of large data center customers. CLR4 specification supports FEC (Forward Error Correction) and non-FEC applications.

Clause & Players

CLR4 Alliance—Altera, Arista, Aurrion, Brocade, Ciena, ColorChip, Dell, ebay, Fabrinet, Fujitsu, Hewllett-Packard, Huawei, Intel, Juniper Networks, Kaiam, MACOM, Materials Magic, NeoPhotonics, Netronome, Oclaro, Oplink, Oracle, SAE Magnetics, Semtech, Skorpios, Source Photonics, TE Connectivity, VMware, 3ality Technica.

100G CWDM4-fs

CWDM4 MSA

The CWDM4 MSA (Multi-Source Agreement) targets a common specification for low-cost 100G optical interfaces that run up to 2 km in data center applications. The MSA uses CWDM technology with 4 lanes of 25 Gbps optically multiplexed onto and demultiplexed from duplex single-mode fiber. CWDM4 MSA targets the broad data center 100G interconnects that support FEC applications.

Clause & Players

CWDM4 MSA—Avago Technologies, Brocade, ColorChip, Finisar, HiLight Semiconductor, Hitachi Metals, II-IV Inc, JDSU, Juniper Networks, Kaiam, Mitsubishi Electric, NeoPhotonics, Oclaro, Oplink, SiFotonics, Skorpios, Sumitomo Electric.

100G CLR4 vs CWDM4

As mentioned above, the specifications of the CLR4 and CWDM4 are very similar. Both include FEC, not in the module but as part of the system design, but whereas FEC is fundamental to the CWDM4, it is optional with the CLR4. The 100G CLR4 specification is fully interoperable with the 100G CWDM4 specification for links using FEC. But as FEC only as an option for CLR4, the CLR4 Alliance’s interface avoids the delay associated with FEC, so that it is more suitable to use in applications such as high-frequency trading where latency is an issue. The following table shows us some details about CLR4 vs CWDM4:

Interface Form Factor Wavelength Fiber Span FEC Support
100G CLR4 QSFP28 1310nm window, 20nm spacing Duplex single-mode fiber (with LC connector) Up to 2 km FEC and non-FEC
100G CWDM4 FEC

 

Conclusion

100G CLR4 and CWDM4 meet the demands on 2km span of large data center. They are similar enough to be interoperable—the CLR4 is fully interoperable with the CWDM4 for links using FEC. FS.COM offers 100GBASE-CWDM4 QSFP28 modules with large stock at very affordable price. For more information, please visit www.fs.com or contact sales@fs.com.

Related Article: QSFP28 PSM4 AND CWDM4 IN DATA CENTER 100G ETHERNET

Considerations of Planning a Pre-terminated Cabling Infrastructure

Considerations of Planning a Pre-terminated Cabling Infrastructure

pre-terminated copper trunkPre-terminated cable assemblies including various trunk cables, patch cords, and plug-and-play cassettes provide a plug-and-play, time-saving and easy-to-deploy solution for links between switches, servers, patch panels and ZDA (Zone Distribution Areas) in a data center. However, compared to field-terminated cabling, pre-terminated cabling need more additional upfront planning and detailed analysis in order to establish the cabling and termination routes and lengths needed. Thus, some key considerations should be remembered when planning a pre-terminated cabling infrastructure.

Architecture & Configuration

Common network architectures include traditional three-tier switch architecture, fabric switch architecture, end-of-row, middle-of-row, and top-of-rack configurations. Understanding what type of architecture and configuration will be deployed in your network will help determine the placement of devices such as switches, routers and servers. In addition, it ultimately impact the cabling termination routes and length needed. It is a very important and basic consideration.

Cabling Media

Cabling media mainly includes copper and fiber. To determine which type should be used is a key part of the planning process. The selection criteria are determined by cost considerations, bandwidth requirement, distance limitations, equipment interfaces, power consumption, pathway space, and overall life-cycle costs. In addition, we should also consider the cabling environment such as the influence of electromagnetic or radio frequency interface (EMI/RFI).

pre-terminated-fiber

Migration & Scalability

A right pre-terminated cabling infrastructure is not only to satisfy today’s requirements but also to meet future-proof upgrade. Knowing the migration strategy and future plans is important for us to choose the right pre-terminated cabling and components with enough scalability. For instance, if we need to migrate from 10GbE to 40/100GbE network, careful consideration should be given to the fiber count, connector type, distances, insertion loss budget, and ease of switching out cassettes or other connectivity components.

Pathways

Pathways contain position, elevations, required separation, and type of pathway system used (e.g. overhead or underfloor) can impact the cable lengths. Thus, considerations such as specific rack heights and clearances, accommodating required separation, selecting the cable support system, etc. should be determined before calculating cable lengths between equipment and patch panels.

Cable Runs

The rack-level detail of the installation is also an important consideration that impacts pre-terminated cable lengths. It is important to order lengths that do not come up short while avoiding too much slack in cabinets and pathways. In addition, bend radius and service loops must be considered. Moreover, proper sequencing is also important to ensure that longer cable trunks are laid into trays first for an overall cleaner installation.

Other Considerations

In addition to the above considerations, there are other important considerations for choosing right pre-terminated cabling, such as cable density and airflow. Cable polarity, color-coding as well as the customer needs and specifications also require proper planning and detailed analysis. If using custom pre-terminated cable assemblies, make sure that the delivery of materials can catch up with your deployment schedule.

Pre-terminated cabling solution helps save much time and even much labour due to its benefits of plug-and-play and easy-to-deploy. But only choosing the right cabling that can satisfy your network demands will get the most out of the investment. The above contents list some key considerations which may give you some guides before planning a pre-terminated cabling infrastructure.

Buyer Guides: FS.COM offers a series of cost-effective fiber and copper pre-terminated cabling solutions which satisfy your today’s and tomorrow network demands. OEM is also available to meet your unique demands. If you are interested in them, you can purchase the most cost-effective products from FS.COM or contact sales@fs.com for details.
Three Patching Configurations for Data Center Rack Management

Three Patching Configurations for Data Center Rack Management

In today’s data center, distribution patch panels and active equipment such as switches, routers, and so on are usually arranged in either the same rack or in two racks located directly next to one another. Thus, to choose a proper patching configuration which is suitable for your network is very necessary. In this post, three commonly used patching configurations are presented.

Interconnect

The interconnect patching solution is usually applied in the application that components are divided over two racks. As the following picture shown, the patch cables here are separated from cabinet to cabinet.

data center patching method-interconnect

Cross-Connect

As shown in the following picture, the cross-connect configuration is similar to the interconnect configuration—components are divided over two racks. But the cross-connect configuration uses pre-terminated cables to create the connection between cabinets or distributors and active equipment.

data center patching method-cross connect

Combined

As its name suggests, in combined configuration, all the components are set in one rack. Thus, it only needs simple patch cabling between height units in this case. See the picture below:

data center patching method-combined

Learning the above three ways to patch equipment, which do you prefer in your network? No matter which one do you choose, always be noted that a clear patching cabling system will make installation and maintenance more efficient and easier. Thus, choose the most proper one according to your needs.

12-Fiber MTP Based TAP LGX Cassettes for 40GbE Cabling With Network Monitoring

12-Fiber MTP Based TAP LGX Cassettes for 40GbE Cabling With Network Monitoring

40GbE is now becoming prevalent in data center. Unlike 10GbE that is used duplex LC infrastructure, the 40GbE uses a different style of fiber cabling, known as MPO/MTP cabling. Meanwhile, network monitoring is also necessary for 40GbE networks. This post present 40GbE cabling with network monitoring using 12-fiber MTP based TAP LGX cassette.

Introduction to 12-Fiber MTP Based TAP LGX Cassettes

The 12-fiber MTP based TAP LGX cassette is designed with four 12-fiber MTP connectors for network ports and monitor ports. All the connectors are on the front. The working principle and polarity inside the cassette are shown in the following picture:

principle

40GbE Direct Connection With Network Monitoring

With two 12-fiber MTP ports for live data transmit and two for monitoring, the 12-fiber MTP TAP LGX cassette can offer high performance used in the 40GbE link, namely between two 40GBASE-SR4 ports, for both signal transmission and data monitoring. See the picture below:

40GbE  connection

Related Product:
Item ID Description
1 17931 40GBASE-SR4 QSFP+ 850nm 150m MTP/MPO DOM Transceiver
2 41251 3M MTP 10G OM4 50/125 Multimode Fiber Optic Trunk Cable, 12 Fiber, Polarity B, Female-Male, LSZH, Bunch
3 63013 4xMTP Female, 70/30 Split Ratio, 12 Fibers, OM4 40GBASE SR4 TAP LGX Cassette
4 61714 12 Fibers MTP Male to 6xLC Duplex 10G OM4 Multimode Staggered Harness Cable, 3.0mm Bunch LSZH Jacket
5 31033 1RU Rack Mount LGX Fiber Enclosure unloaded, holds up to 3 LGX Cassettes
6 61714 12 Fibers MTP Male to 6xLC Duplex 10G OM4 Multimode Staggered Harness Cable, 3.0mm Bunch LSZH Jacket
7 41251 3M MTP 10G OM4 50/125 Multimode Fiber Optic Trunk Cable, 12 Fiber, Polarity B, Female-Male, LSZH, Bunch
8 17931 Generic Compatible 40GBASE-SR4 QSFP+ 850nm 150m MTP/MPO Transceiver for MMF
10GbE to 40GbE Migration With Network Monitoring

Using a MTP harness cable assembly, we can easily achieve the 10GbE to 40GbE migration with monitoring based on the above applications:

10GbE to 40GbE migration

Related Product:
Item ID Description
1 17931 Generic Compatible 40GBASE-SR4 QSFP+ 850nm 150m MTP/MPO Transceiver for MMF
2 41251 3M MTP 10G OM4 50/125 Multimode Fiber Optic Trunk Cable, 12 Fiber, Polarity B, Female-Male, LSZH, Bunch
3 63013 4xMTP Female, 70/30 Split Ratio, 12 Fibers, OM4 40GBASE SR4 TAP LGX Cassette
4 61714 12 Fibers MTP Male to 6xLC Duplex 10G OM4 Multimode Staggered Harness Cable, 3.0mm Bunch LSZH Jacket
5 31033 1RU Rack Mount LGX Fiber Enclosure unloaded, holds up to 3 LGX Cassettes
6 61714 12 Fibers MTP Male to 6xLC Duplex 10G OM4 Multimode Staggered Harness Cable, 3.0mm Bunch LSZH Jacket
7 42482 3M MTP-4LC Duplex 10G OM4 50/125 Multimode Fiber Optic Harness Fan-out/Breakout Cable, 8 Fiber, Polarity B, Male, LSZH-Magenta, Bunch
8 11589 Generic Compatible 10GBASE-SR SFP+ 850nm 300m DOM Transceiver

 

Reference: TAP LGX CASSETTE Optics Cabling Connection in Date Center Hosting

Use TAP Module for Efficient Network Monitoring in 10GBASE-SR Link

Use TAP Module for Efficient Network Monitoring in 10GBASE-SR Link

The growth in data traffic is being driven both by increased cloud and big data services. Data center managers are facing a challenge of gaining superior visibility of their networks, enhancing application performance, and ensuring integrity of the security system. Traffic access points (TAPs) which are accurate, reliable and OPEX-saving are the ideal solution to access the data and meet the demands on extensive visibility. This post will show a typical 10GBASE-SR link including an optical cross-connect with an integrated 50/50 TAP Module.

Network Monitoring With TAP Modules

In today’s modern data centers, effectively monitoring and managing the data traffic is one of an important parts to evaluate the performance of data centers. Implementing TAP into the network for data collection and analysis enables data center managers to continuously and timely monitor the equipment and network which ensures rapid response time when problems are identified. TAP module is a commonly used component in data center. It is connected between two switch ports via LC or MTP patch cords, establishing an identical copy of the optical signal passing through it.

Understanding the Signal Path Schematics of TAP & TAP Module

The working principle of TAP is simple. In general, the fiber optic cable with the incoming signal is connected to the splitter input. The split signal is then separated into the live output which is connected to the receiving inband device, and the TAP output which is connected an out-of-band device. Due to the fact that a TAP utilizes such splitters in a duplex fashion, a complete copy of all traffic between two devices can be produced, as the following picture shown:
TAP-principlesTAP module, also called TAP cassette, or fiber TAP cassette, is generally a LGX cassette designed for TAP and patching applications. As the right side of the picture shown, the two MTP connectors (live port) provide two connections for serving the live traffic channels via trunk cables, and two MTP connectors (TAP) serve the TAP channels for connecting to monitoring equipment via MTP trunk or MTP-LC harness cables. And the front surface of the modules provides 12 LC-duplex ports for patching, as the left side shown.
TAP modules

Use Case of 50/50 TAP Module in 10GBASE-SR Link at the Cross-Connect

A 50/50 TAP module uses a 50/50 ratio which means 50% of the incoming light goes to the live port and 50% to the TAP port. A 50/50 TAP module is usually used between two given network devices such as switches, routers, and storage, providing network and security personnel a connection for monitoring. The picture below shows a typical 10GBASE-SR link including an optical cross-connect with an integrated 50/50 TAP module.

TAP Module Use Case

Conclusion

TAP module is an ideal solution for data center managers to effectively monitor and maintain their network dynamic and data traffic. If you are still worrying about the complex data traffics monitoring, try to use TAP modules in your network.