Here's An Easier Way To Upgrade To 400G Optics
Cisco News, April 30th, 2020
April 30, 2020,
Volume 265, Issue 5

In previous posts we saw how the single-lambda 100G approach to optics helps simplify designs and enables massive volume manufacturing. This has come to fruition in the QSFP28 100G FR pluggable transceiver.

"Let's also consider its relation to the latest generation of switches and routers with 400G ports. Single-lambda 100G is used in 400G optics technology as well, and because of that, it allows for network upgrades with the greatest operational flexibility. The key is that it enables 400G optics to interoperate with 100G optics via fiber optic breakout. For example, 400GBASE-DR4 modules in a QSFP-DD form factor, such as Cisco's QDD-400G-DR4-S, can connect with four separate QSFP28 100G FR modules. This means that if your network uses host platforms with 100G QSFP28 ports filled with FR optics, you can upgrade just one site with 400G host platforms and still connect it to the existing 100G sites without sacrificing port bandwidth...."

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