25G Ethernet
13.12.21
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With the massive increase in demand for huge bandwidth requirements of private and public cloud data centers and communication service providers (telco), and because of the recent advancements in the 25G Ethernet speed technology, the ICT researchers and developers promoted 25 Gigabit Ethernet to meet the requirement of higher bandwidth for Internet users. In fact, 25GbE ports are growing rapidly in data center server access ports. This article will introduce 25GbE Ethernet and 25G SFP28 transceiver.
What Is 25G Ethernet?
25G Ethernet is a proposed Ethernet standard at 25 gigabits per second (25 GbE). 25 GbE was approved in 2016 and developed by the 25G Ethernet Consortium and IEEE 802.3by task force, which also includes 50 GbE. The 25 and 50 GbE speeds are even divisions of 100 Gigabit Ethernet, which comprises four 25 Gbps streams. Therefore, migrating in the future from 25 or 50 to 100 GbE is expected to be more economical than going from 40 to 100 GbE. 25GbE take benefit for cloud and enterprise data center environments.
25GbE leverages technology defined for 100GbE implemented as four 25Gbps lanes (IEEE 802.3bj) running on four fiber or copper pairs. Quad small form-factor and 100Gb form-factor pluggable transceiver (QSFP28/ CFP) modules have four lasers, each transmitting at 25Gbps. Each lane requires a Serializer/Deserializer (SerDes) chipset. The twisted pair standard was derived from 40GbE standards development. The following table provides a summary of key upcoming IEEE standard interfaces that specify 25GbE.
Why 25G Ethernet?
More performance improvements for 25G
25G solutions offer 2.5 times the bandwidth, but they are not much more expensive than 10G Ethernet solutions. In addition, when connected to 10G devices, they are fully backward compatible. When upgrading a data center network to 25G, you can use the 25G feature to refresh the network instead of upgrading the entire system. Compared with the 40G solution, the basic technology of 40G Ethernet is only four channels of 10G speed. It does not have the advantages of cost, power consumption and server rack density for wide speed conversion. All in all, 25G Ethernet reduces cost and power requirements, making network bandwidth cost-effective and supporting next-generation server and storage solutions in cloud and Web-class data center environments.
Lower Cost than 10G per port
25G solutions offer The proposed 25GbE standard provides 2.5 times the amount of data compared to existing 10GbE solutions. It also provides greater port density and lowers port density Cost per unit of bandwidth by leveraging switch port functionality compared to 40GbE solutions. The specification adopted by the Alliance uses single-channel 25GbE and dual-channel 50GbE link protocols. To help promote adoption, news specifications can be provided free of charge to any data center ecosystem provider or to consumers who join the alliance.
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