To use a multicast stream as a content source

In the console tree, click the broadcast publishing point you want to use to broadcast the multicast stream.
In the details pane, click the Source tab.
Click the Change button.
The Change <publishing point> content source dialog box appears.
In Location, type the directory path to the multicast information file (which has a .nsc file name extension). Windows Media Services can access an .nsc file that is stored on a local drive or on a network shared drive. The path should be in the following format:
MCast://%systemdrive%\Wmpub\Wmroot\File.nsc

-or-

MCast://\\MachineName\Inetpub\Wwwroot\File.nsc

Note Image Notes

Using a multicast stream as a content source in a playlist is only available in the Windows Media Services snap-in.
You can include a multicast stream as a content source in a server-side playlist by specifying the URL to the multicast information file as a src attribute of a media element. To do this, the playlist that references the multicast stream must already be assigned to a broadcast publishing point. Then, using the playlist editing control on the Source tab in the Windows Media Services snap-in, add a media element for the multicast stream. You cannot add a multicast stream to a playlist using the Playlist Editor. When adding the URL to the multicast information file, you must specify an absolute path, such as MCast://C:\Wmpub\Wmroot\File.nsc or MCast://\\MachineName\Inetpub\Wwwroot\File.nsc.
Multicast streaming and the WMS Multicast Data Writer plug-in are available only if Windows Media Services 9 Series is running on the following editions of the operating system: Windows Server 2003, Enterprise Edition and Windows Server 2003, Datacenter Edition. If you are running Windows Server 2003, Standard Edition, these features are not supported.