How to Achieve 10G to 40G Network Migration at Zero Cost

Generally speaking, a cabling upgrade is indispensable if we intend to migrate network from 10G to 40G. It is no doubt that this would afford the extra expense and time. Is there a solution to allow us to get the best of both worlds—save both money and time? The answer is yes—Juniper’s QSFP+ LX4 transceivers provide 40 Gbps connectivity with immense cost savings and simplicity for next-generation data center 40GbE deployments. But what is it? And how does it work? This article would provide a satisfying solution for you.

Overview on Juniper QSFP+ LX4
LX4 is a new 40G Ethernet optical technology, which represents a new way to deploy 40GbE that meets all of the performance criteria of today’s data centers. The Juniper QSFP+ 40G LX4 transceiver, a short-reach optical transceiver that delivers 40 Gbps over duplex OM3 or OM4 MMF, allows 40 Gbps connectivity to connect directly to the 10 Gbps fiber and fiber trunk. It has four 10 Gbps channels, each of which can transmit and receive simultaneously on four wavelengths over an MMF strand. The result is an aggregated duplex 40 Gbps link over a duplex of two MMF strands. Using duplex LC connectors, QSFP+ LX4 connections can reach 100 m on OM3 MMF or 150 meters on OM4 MMF. Products that support 40GbE interfaces such as QFX3000 QFabric Systems and QFX5100 switches support the QSFP+ LX4 transceiver.


How to Achieve 40G Upgrading With Juniper QSFP+ LX4?
Different from traditional network updating, migrating from 10G to 40G with 40Gbps LX4 transceiver is straightforward: users simply replace existing 10GbE optical modules with 40GbE LX optical modules. There is no need for expensive 40GbE migration cassettes and no need to deploy an additional fiber infrastructure. Connections using unstructured cabling are connected directly with fiber cables: this direct-attachment design is typically used to connect devices over short distances in a data center network, such as switches installed in the same or adjacent racks. Juniper’s QSFP+ LX4 uses LC connectors. Existing 10G connections are commonly MMF cables with LC connectors. Juniper QSFP+ LX4 allows the same cables to be used for direct 10G connections to direct 40G connections, resulting in zero-cost cabling migration.

The following figure shows an example of in-place 10G to 40G migration using LX4 pluggable modules.



Greater Savings for 40G Migration
No additional spending on cabling will be required if Juniper QSFP+ LX4 transceivers are used for all 40Gbps links. As a result, users realize 100 percent investment protection of their existing infrastructure and incur no additional cabling costs—a significant advantage when compared to the cost of new patch cables, new patch panels, and expansion of the current fiber trunk. If the cabling for this network is an expansion to the existing cabling system, the 40Gbps connections can be built using MMF cables and QSFP 40G SR4 transceivers or QSFP 40G LX4 transceivers.Juniper QSFP+ LX4 technology removes the cost barriers for migrating from and expanding the existing 10G cabling footprint to a 40G infrastructure to enable a higher data rate in the network.

Conclusion
The Juniper QSFP+ LX4 transceiver allows organizations to migrate their existing 10Gbps infrastructure to 40Gbps at zero cost of fiber, which provides a cost-effective solution for migrating to next-generation 40Gbps data center deployments.

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