The 400GE BiDi MSA Group founded in July focuses on promoting interoperable 400GE optical specifications that utilize multi-mode fiber (MMF) for applications up to 100m link distances. The MSA leverages BiDi technology that has been widely deployed by Cisco and others for 40GE and 100GE applications over duplex MMF. With the arrival of 400GE applications, customers will finally have no choice but to start using MMF transceivers that require more than duplex fiber. 400GE ports can be used to aggregate traffic from 100GE ports, still leveraging the duplex MMF from 100GE BiDi modules to 400GE modules in a breakout configuration as shown in the diagram below.
Sourced through Scoop.it from: blogs.cisco.com