25G over SMF.
“IEEE 802.3cc provides network operators a cost-effective upgrade path to 25 Gb/s that minimizes network design, installation and maintenance costs by preserving current network architecture, management, and software,” said David Lewis, chair, IEEE 802.3cc 25 Gb/s Ethernet over Single-Mode Fiber Task Force. “The work of the IEEE 802.3cc 25 Gb/s Ethernet over Single-Mode Fiber Task Force has demonstrated how responding quickly to industry demand for greater energy-efficient Ethernet capabilities can be achieved in a manner that can reduce both operational costs, and the environmental footprint of network upgrades.”
- Useful for Metro Ethernet and replace 10G
- Not useful in private cloud or megascales. Easier/cheaper to use coax or MMF.
- Not fast enough for ECMP spines.
- Vendors likes to sell older technology because its profitable, make sure you ask for modern stuff.
- 100G will be the sweet spot in a few years and likely this will be a short term thing.
IEEE Publishes IEEE 802.3cc-2017 25 Gb/s Ethernet Standard for Enhanced Enterprise and Metro Network Applications over Fiber : http://standards.ieee.org/news/2018/ieee_ethernet_standard_802-3cc_2017.html