IEEE Std 802.15.7-2018 pdf download – IEEE Standard for Local and metropolitan area networks- Part 15.7: Short-Range Optical Wireless Communications.
A device management entity (DME) is also supported in the architecture. The DME can talk to the physical layer management entity (PLME) and MAC (sub)layer management entity (MLME) to interface the MAC and PHY with a dimmer. The DME can access certain dimmer-related attributes from the MLME and PLME in order to provide dimming information to the MAC and PHY. The DME can also control the PHY switch using the PLME for selection of the optical sources and photodetectors. The details of the DME are outside the scope of this standard. The PHY switch interfaces to the optical service access point (SAP) and connects to the optical media, which may consist of a single or multiple optical sources and photodetectors. Multiple optical sources and photodetectors are supported in this standard for PHY III and for OWC cell mobility. The PLME controls the PHY switch in order to select a cell. The line going to the optical SAP from the PHY switch is a vector. The number of lines comprising the optical SAP has the dimension ofn x m, where n is the number of cells and m is the number of distinct data streams from the PHY. The value of m is three for PHY II. 4.4.1 PHY types The PHY supports multiple PHY types. a) PHY I: This PHY type is intended for outdoor usage with low data rate applications. This mode uses ON_OFF keying (OOK) and variable pulse position modulation (VPPM) with data rates in the tens to hundreds of kbps, as defined in Table 76. b) PHY II: This PHY type is intended for indoor usage with moderate data rate applications. This mode uses OOK and VPPM with data rates in the tens of Mbps, as defined in Table 77. c) PHY II: This PHY type is intended for applications using color-shift keying (CSK) that have multiple light sources and detectors. This mode uses CSK with data rates in the tens of Mbps, as defined in Table 78.