Tag: BiDi

Bi-directional USB-C active cable reference design unveiled

Analogix Semiconductor has released Times Square RD1011, a high-performance reference design defining a USB-C to USB-C active cable with bi-directional support, capable of connecting a USB-C source to a USB-C device across multi-meter distances. New active cable architecture, featuring SRIS and LTTPR support, is positioned as a superior option for connecting display monitors, docking stations, and VR HMDs.

Fiber. Great In Your Diet. Costly In Your Data Center

Let’s say you’re in charge of a data center and your boss reminds you that streaming video and IoT devices are all the rage and if you don’t keep up with bandwidth demand, you’re toast. You have 10G links that use 10G SFP+ SR transceivers at the aggregation layer. You upgrade your switches or linecards to ones that have 40G QSFP ports like the Nexus series switches.You now have a couple of choices for the QSFP ports: You could use QSFP SR4 transceivers, which requires ribbon fiber. That means you’d have to install more trunk fiber and modify patch panels to handle the MPO (Multi-Fiber Push On) connectors. Or you could use the QSFP BiDi transceiver, which, by the way, costs less than the SR4 transceiver. All you have to do is unplug the dual fiber MMF (Multi-Mode Fiber) cable that you already have in place, and plug it right into the BiDi. No hassle. Boss happy. Seems obvious, doesn’t it?

New MSA Formed to Tackle 400GE Over Multi-Mode Fiber

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.