Figure 13. Windows Media Player displaying media-sharing features that let it act as a media renderer to receive content from other Windows 7 PCs and devices

Figure 14 shows the protocol layers in a DMR device. DMR devices support Wi-Fi or Ethernet for connectivity. They implement TCP/IP, UDP/IP, and HTTP, and implement the UPnP MediaRenderer functionality that includes the three services discussed earlier (connection manager, AV transport, and rendering control). DMR devices implement HTTP and extensions to receive content from a DMS in the network, and some use RTP for transfer.