Tag Archive | CFP2

Will CPAK 100G Transceiver Module Thrive in 2017?

Currently, prices on 100G optical transceivers have been dropping faster than those devices at 40G, which drives customers to migrate to 100G directly instead of turning to the intermediate 40G Ethernet. For example, QSFP-40G-SR-BD ($300) costs higher than QSFP-100G-SR4-S ($269) at FS.COM. It is the same case as other vendors. QSFP28 and CFP optical transceivers as the main transmission media of 100G network, dominate 100G hardware market.

100G transceiver modules

CPAK, released right after CFP2 100G modules, is the Cisco proprietary form factor, which greatly effect the popularity of this module type. However, in 2017, many third party optical solution vendors like FS.COM announce to help market to cut down this pricing and save budgets for services providers and operators. So will it thrive in 2017? Today’s article will describe CPAK 100G module in detail attached with the positive analytics of the future of this module type.

Unveiling CPAK Optical Transceiver Module

CPAK 100GBASE optical module, designed as a smaller, low-cost alternative to CFP transceiver, can be plugged into the CPAK ports of Cisco switches and routers. Besides, CPAK module is the first 100G optical transceivers that use CMOS Photonics technology. This type of 100GBASE modules can work in the following Cisco networking equipment—ASR 9000 Series Router; CRS-X Carrier Routing System; NCS 2000, 4000, and 6000 Series Routers; the Nexus 7000 and 7700 Series Switches, and the Cisco ONS Transport Platform.

CPAK optical transceiver incorporates IEEE standard interfaces available in several different types: 100GBASE-SR10, 100GBASE-ER4L, 100GBASE-LR4, 10x10G-ERL, 10x10GBASE-LR, etc. CPAK transceivers can support 10X10Gbps and 4X25Gbps mode for an aggregate of 100Gbps data rate. It can also operate high-density 10G breakout with MPO-24 cables. CPAK-100G-SR10 is backward compatible with 10GBASE-SR. While CPAK 10X10G-LR is compatible with 10GBASE-LR optics. CPAK LR4 module is compatible with other 100GBASE-LR4 compliant modules such as CFP to support high-bandwidth 100Gb optical links over standard single-mode fiber terminated with SC connectors. Table 1 shows the existing Cisco 100G CPAK Modules.

Cisco CPAK modules

CPAK Out-Competes CFP/CFP2 for Smaller Footprint & Energy Economy

Once the CPAK transceiver module had been released, it was marked as the smallest 100G footprint providing higher-port density and low power consumption for 100G networks. When comparing with CFP modules, CPAK transceivers are less than one third the size of CFP modules, and dissipate less than one third the power. In a comparison with CFP2 modules, CPAK optical transceivers are 20% smaller and consume 40% less power. In other word, if you use CPAK other than CFP2 modules in your data center switches, it can offer 20% greater port density and front-panel bandwidth.

100G-module-evolution

To sum up, CPAK optical module has smaller footprint than CXP, CFP and CFP2, but bigger than CFP4 and QSFP28 optics. Besides, CPAK 100GBASE-LR4 consumes less than 5.5W, which is less than CFP LR4 (24W), CFP2 LR4 (12W), CFP4 (9W) and CXP LR4 optics (6W) but a little higher than QSFP28 (3.5W). CPAK represents a significant advancement in optical networking, providing dramatic space and power efficiency.

CPAK Vs. QSFP28

QSFP28 optical transceiver is regarded as the most promising 100G optical module due to its smallest form factor and lowest power consumption. For example, Cisco CPAK 100GBASE-LR4 module supports link lengths of up to 10 km over standard single-mode fiber with SC connector with a nominal power consumption of less than 5.5W. QSFP28 100GBASE-LR4 supports up to 10km and consumes nearly 3.5W. CPAK optics obviously don’t have a shot when competing with QSFP28 optical transceivers.

What About the Future of CPAK Modules?

In 2017, 100G technology and relevant optical transceivers gradually become mature. 100G optics like CXP, CFP/CFP2/CFP4, 100G QSFP28 in different standards offers a huge selection for customers. Of which QSFP28 100G modules, thanks to the smallest form factor and reliable performance, maintain large market share in 100G hardware market. In addition, some newly released 100G switches only have QSFP28 ports which in turn promotes the popularity of 100G QSFP28 transceivers.

In such a fierce market environment, it is hard to say whether CPAK will be a hot star in 100G hardware market or not. Anyhow—CPAK module is the first optical transceivers that use CMOS electronic technology. Furthermore, Cisco and several other vendors offer CFP2 to CPAK adapter to support the conversion between CPAK and CFP2 modules. Third party vendors like ourselves are also beginning to supply 100G CPAK modules in 2017. We will see if such industry development will take place!

Summary

CPAK module was launched just days after the certification of CFP2 optics. It is popular for the smaller footprint and energy economy. However, when competing with open source MSA compatible 100G products (CFP/CFP2/CFP4 and QSFP28), CPAK is not the ideal one for 100G high-density connectivity. The world undergoes a myriad changes in the twinkling of an eye. For the newly information about our new-coming CPAK modules, please visit fs.com or pay attention to the updated article in this blog.

Original Source: Will CPAK 100G Transceiver Module Thrive in 2017?

Several 100G DWDM Solutions for Arista 7500E Series

To keep up with the global demand for higher bandwidth, Arista has designated 7500E series switch to address 100G long-hual dense wavelength division multiplexing (DWDM) connectivity. Arista 100G interconnect solution combines Layer 2/Layer 3 switching, wire-speed encryption and coherent DWDM into a high-density line card for the Arista 7500E data centers. Along with the introduction of Arista 7500E series switches, this article will illustrate several 100G DWDM solutions for distance up to 80 km, 150 km and 3000 km as well.

Arista 7500E Series Switch & Line Card

Arista 7500E series is the second generation of 7500 series switch that delivers scalable and deterministic network performance for mission critical data centers, enterprise and HPC environments. Available in a compact 7RU (4-slot) or 11RU (8-slot), Arista 7500E offers over 30Tbps of total capacity for 1,152 ports of 10GbE, 288 ports of 40GbE and support for 96-port 100GbE with a broad choice of interface types that support flexible combinations of 10G, 40G and 100G modes on a single port.

The 7504 and 7508 are the two types of Arista 7500E series switches. The 7508 systems support 8 linecards, dual supervisor modules and 6 fabric modules to provide a full 30Tbps of capacity. The smaller 7504 systems share a common architecture with the 7508 with the primary difference being support for 4 linecards and 15Tbps of forwarding capacity. The most unique feature of this switch is that it can connect with 10G SFP+, 40G QSFP+, 100G QSFP28 and CFP2 modules.

arista-7500E-switch

Arista 7500E series line card for addressing 1/10G, 40G and 100G with full support for industry standard connections and comprehensive layer 2 and 3 features for flexible deployment choice. The line card delivers error-free performance up to 3000 km of fiber and consumes less than 140W per 100Gbps. Similar to any other Arista platform, the DWDM line card utilizes the single binary image of Arista’s extensible operating system (EOS). Line cards with CFP2 and QSFP support standard 100G for both single and multimode fiber for distance up to 40 km.

Why Need 100G DWDM Solution?

100G optical transceivers provide the most straightforward method to connect 100G traffic over long-hual applications. 100G optics like CFP and QSFP28 offer cost-optimized solutions for connecting 100G switches together in a rack or data center. Nevertheless, the small and cost-effective QSFP28 100G optics now can only handle connections over distances of less than 10 km. For example, QSFP28 LR4 is compliant with 100GBASE-LR4 standard that operates over duplex LC cables for a link length of 10 km.

As to the CFP form factors, coherent CFP modules is designed to support metro and long-hual DWDM applications. CFP 100GbASE-ER4 can support up to 40 km. However, owing to its large size and high power consumption, CFP transceivers are less popular on the market. If you want to use CFP optics for 100G deployment, keep in mind, CFP modules are too large to fit in the Ethernet switches and will significantly reduce port counts and increase power usage, making 100G switches poor performance in cost-effectiveness. Therefore, customers who want to upgrade 100G network can only cover a distance of 10 km, which is obviously insufficient for geographically separated data centers or metro infrastructures. Figure 2 shows the basics of DWDM system.

DWDM-System

To realize 100G long-distance transmission, Arista 100G DWDM solution combines DWDM optics with a fully passive Mux/Demux system that can handle up to 3,000 km. Arista 100G DWDM solution is a 6 x 100G Coherent DWDM line card for the 7500E series with integrated wire-speed encryption and analog coherent CFP2 optical interfaces. Several use cases for the Arista 7500E Series DWDM card in multi-site data center networks exist. The following sections identify three use cases for Arista 7500E DWDM solutions.

Use Cases for Arista 7500E DWDM Solution
  • Use Case 1—Less Than 80KM Dark Fiber Connection

For a typical metro link that is less than 80 km, Arista 7500E Series DWDM line cards can directly terminate a dark fiber connection providing a point-to-point connection between two locations.

DWDM solution for 80 km

Just as figure 3 shows, Arista DWDM solution is ideal for metro applications transmitting up to 9.6Tbps traffic without the need for any additional amplification.

  • Use Case 2—Greater Than 80 km But Less Than 150 km

When extending the distance beyond 80 km, there is a need to amplify the signal to offset heavy signal loss that occurred in the light signal when passing through fiber cables, patch panels and other optical devices. Under this circumstance, EDFA’s or Erbium Doped Fiber Attenuators are employed to give the aggregated wave a boost.

100G DWDM solution about 100 km

By using EDFAs (seen in Figure 4) to the transmit side of each end of the dark fiber link, the signal can be boosted to achieve distances of up to 150 km. Exact distances will be dependent on the number of patches, fiber splices and quality of the fiber.

  • Use Case 3—Greater Than 150 km But Less Than 3,000 km

Arista 7500E DWDM solutions can also cover the distance of greater than 150 km but less than 3000 km. Employing further EDFAs at a spacing of approximately 80 km along the fiber route allows the length of a connection to be extended to over 3,000 km. As shown below, EDFAs are used on both paths to boost the signal.

DWDM solution for 3000 km

Supported Optics for Arista 7500E Series

All Arista 10G SFP+ transceivers, with the exception of LRM, are supported on the Arista 7500E SFP+ ports.

Interface Type SFP+ ports
10GBASE-CR 0.5m-5m
10GBASE-AOC 3m-30m
10GBASE-SRL 100m (OM3) / 150m (OM4)
SFP-10G-SR 300m (OM3) /400m (OM4)
SFP-10G-LRL 1km
SFP-10G-LR 10km
SFP-10G-ER 40km
10GBASE-DWDM 80km
SFP-10G-ZR100 100km
100Mb TX, 1GbE SX/LX/TX Yes

The 40G QSFP+ transceivers and cables allow for 4x10G mode support with the use of fiber breakout cables, MTP to LC cassettes, or QSFP to SFP+ cables. See the below table for details on the latest supported 40G transceivers.

Interface Type QSFP+ ports
40GBASE-CR4 0.5m-5m
40GBASE-AOC 3m-100m
QSFP-40G-UNIV 150m (OM3) / 150m (OM4), 500m (SM)
QSFP-40G-SRBD 100m (OM3) /150m (OM4)
QSFP-40G-SR4 100m (OM3) / 150m (OM4)
QSFP-40G-XSR4 300m (OM3) / 400m (OM4)
QSFP-40G-PLRL4 1km (1km 4x10G LR/LRL)
QSFP-40G-PLR4 10km (10km 4x10G LR/LRL)
QSFP-40G-LRL4 1km
QSFP-40G-LR4 10km
QSFP-40G-ER4 40km

100G QSFP28 and CFP2 Optics

Interface Type 100G CFP2 Ports 100G QSFP Ports
100GBASE-XSR10 300m OM3 / 400m OM4 Parallel MMF
100GBASE-SR4 100m OM3 / 150m OM4 Parallel MMF
100GBASE-LR4 10km SM Duplex 10km SM Duplex
100GBASE-LRL4 2km SM Duplex
100GBASE-ER4 40km SM Duplex
100GBASE-CWDM4 2km SM duplex
100GBASE-PSM4 500m SM Parallel
100GBASE-AOC 3m to 30m
100GBASE-CR4 1m to 3m
Conclusion

Arista 7500E DWDM solution works in conjunction with passive Optical Mux/Demux devices and in-line amplifiers to support additional bandwidth and extended reaches. Arista 7500E DWDM solution can directly reach up to 80 km without requiring in-line amplification, which is ideal for metro applications. With an Optical Signal to Noise ratio (OSNR) of 11.6dB, it can be used effectively for point to point long-haul applications up to 3,000kms with in-line amplifiers and multiplexers.

Related article : How to Deploy QSFP28 Modules for 100G Deployment