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Data Centre

Catching the Wave With 40G Technology

40g in data center

Catching the Wave With 40G Technology

FS Official 2017-01-22

Have you ever frustrated by your 10G network which is on the verge of capacity limitation? Or you just can’t help but worrying that your design may not provide enough speed for those bandwidth hunger application. Well, you are not alone. So it’s high time to get rolling and move 40G into your data centre.

In 2016, just eight years after the adoption of 10 Gigabit Ethernet, IEEE published 802.3ba to pave the way for 40 Gigabit Ethernet. The original driver behind this is the massive application of high-speed, high-demand computing applications and technologies. Let’s see in which way 40G technology transform the data centre infrastructure.

40G: Where Budget, Speed and Scalability Meet

The growth in 10GbE connectivity at the server edge will ultimately drive 40 GbE uptake. In order to reduce the increasing complexity associated with managing multiple 10 GbE uplinks form every server rack, enterprises will move to 40 GbE technology. Which pushes the bounds of higher speeds, massive scalability and greater flexibility. Consequently, 40G market is fast maturing - 10G and 40G adoption has reached a break-even point before 2008, and then the latter becomes more economical, with prices likely to drop below the 10G cost.

40 gigabit ethernet technology

40G changes the way signals are transmitted, adopting parallel transmission instead of duplex transmission that used in 10G cabling. Aside from the data-rate increase, it provides higher density and lower cost alternative: with 4 times the capacity and the ability to cost effectively migrate to 100G, 40G Ethernet on multimode fibre is proven to be a logical step in the evolution of the network.

Migrating to 40G Ethernet: A Build-to-Suit Trend

When the 40G market started, it was primarily for connecting data centres together and for router links, connecting cities together. A variety of 40G optics are introduced to meet the requirement of  both short and long-haul data transmission.

An Overview of 40G QSFP Transceivers

40G QSFP (Quad Small Form-Factor Pluggable) transceivers offer service providers high density 40 Gigabit Ethernet connections in enterprise data centres. There exist a dazzling array of 40G QSFP transceivers, which is listed in the following chart with details including their interfaces, cabling media and maximum reach.

Transceiver Type Wavelength Interface Optical Components Max Distance Protocols

40GBASE-SR4

850 nm

MTP/MPO

VCSEL 850 nm

150m over OM4

40G Ethernet, Infiniband QDR, SATA/SAS3, IEEE 802.3ba

40GBASE-CSR4

850 nm

MTP/MPO

VCSEL 850 nm

400m over OM4

40G Ethernet, Infiniband QDR, SATA/SAS3, IEEE 802.3ba

40GBASE-PLRL4

1310 nm

MTP/MPO

FP 1310nm

1.4km over SMF

40Gigabit Ethernet, 10Gigabit Ethernet, 38-pin edge connector

40GBASE-LX4

1310 nm

LC duplex

DFB CWDM

150m over OM3/OM4
2km over SMF

40G Ethernet

40GBASE-LR4L

1310 nm

LC duplex

FP 1310 nm

2km over SMF

40G Ethernet, Infiniband FibreChannel, SATA/SAS3

40GBASE-PLR4

1310 nm

MTP/MPO

DFB CWDM

10km over SMF

40Gigabit Ethernet, 10Gigabit Ethernet

40GBASE-ER4

1310 nm

LC duplex

DFB CWDM

40km over SMF

OTN OTU3, 40G Ethernet, Infiniband, Fibre Channel, SATA/SAS3

40GBASE-SR BiDi

832nm - 918nm

LC duplex

VCSEL 850 nm

150m over OM4
100m over OM3

40G Ethernet, IEEE802.3ba-2010

40GBSE-LR4

1310 nm

LC duplex

DFB CWDM

10km over SMF

OTN OTU3, 40G Ethernet, Infiniband, Fibre Channel, SATA/SAS3

Mixing 10G and 40G Cabling? QSFP+ Universal Transceiver Came to Secure

Have you ever encountered the situation that, when integrating 10G infrastructure to 40G, the cost and deployment time tends to increase because of the different cabling structure. Then how to streamline the installation and decrease the cost while ensure the smooth transmission? A universal transceiver was introduced by Arista to rescue – QSFP-40G-UNIV or QSFP+ 40G universal.

PHY Type Connector Type Wavelength Cable Type Core Size Modal Bandwidth (MHz*Km) Operating Distance

40GBASE-UNIV

LC

1270nm, 1290nm 1310 nm, 1330nm

OM3/OM4

50

2000 (OM3) 4700 (OM4)

150 m

SMF

G.652

/

500 m

With a duplex LC port for dual-way transmission, this QSFP+ universal transceiver can be used in a variety of applications. It uses four different wavelengths and can support optical transmission over both single-mode and multimode fibre. It is known that 10G network utilizes two fibres for dual transmission, while 40G applications uses 12-fibre MTP based fibre. So you have to change the cabling structure by laying more fibres for 10G to 40G upgrade. The 40G QSFP+ UNIV module offers two strands of fibre for dual-way transmission that resembles most 10G network, so the cabling structure of the legacy 10G can be saved when migrating to 40G network, the cabling flexibility is further improved.

qsfp-40g-univ-cabling

40G Breakout Cabling for Smooth Integration

As the 40G technology continues to advance, it is also used to integrate with 10G applications by muxing together four 10G connections. Which contributes drastically to cut costs and make more efficient use of available spectrum. Data centres have developed 4×10G Ethernet breakout cables that terminated with one 12-fibre MTP/MPO connector at one end and four duplex LC connectors at the other end. The four LC cables each delivering 10G, for a total of 40G. The same breakout strategy is likely to be used to eventually support 100GbE and 400GbE server interconnects, offering data centre an appealing and cost-effective migration strategy into the higher speeds.

40g breakout cabling

How to Test the Compatibility of Your 40G Transceivers?

Third-party optical transceivers have taken a certain fraction of the current 40G optics market. To ensure the compatibility of the transceiver module and device, testing is necessary before putting into use. Here we take FS Cisco QSFP-40G-SR4 compatible 40GBASE-SR4 QSFP+ transceiver for example, to test if it is fully compatible with Cisco Nexus 9396PX switch. Referring to the following procedure and the video to perform transceiver testing.

1. Plug the Cisco QSFP-40G-SR4 compatible QSFP+ into the 40Gbps ports of the Nexus 9396PX.

2. Plug the cleaned MTP patch cord into the optical ports of the transceivers.

3. View the state of LED light and more information in the CLI.

Note:

1. Always clean the optical transceiver interface before connection.

2. Wear an ESD wrist strap or anti-static gloves when installing or removing a transceiver.


Testing Demo Video


Minimize the Pain, and Maximize the Financial Gain

The boosting market of 40G has triggered some debates among IT managers. They hesitate whether to deploy 40G technology or wait for the pending 100G. This confusion, however, is fast becoming void since 40G provides design flexibility and cost advantage over 100 Gigabit Ethernet. 40G can be effectively deployed in aggregation links, and it can be commonly applied to access links to connect servers. At least for now, they can co-exist in enterprise data centres, and 100G cannot completely replace 40G with the years to come. Complimenting 40G, 100G is a perfect choice for carrier service providers and core links in data centres. Analysts expect 40G deployments to start ramping up with broader adoption in 2018.

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