Fig. 17
From: ELIoT: enhancing LiFi for next-generation Internet of things
![Fig. 17](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13638-022-02168-6/MediaObjects/13638_2022_2168_Fig17_HTML.png)
Passive DUs: schematic, where the red path refers to a optical downlink, b uplink
From: ELIoT: enhancing LiFi for next-generation Internet of things
Passive DUs: schematic, where the red path refers to a optical downlink, b uplink