This is about a logical mapping from media types to ad server. An ad server publisher can operate several technical ad servers, as shown above. If a mapping to the media types is created via the Ad Server Site, they can be selected in the placement system.

This mapping is necessary to ensure that all information is logically related to DML and the Wasmuth ID.

If there is only one MediaType, a connection to each publisher must still be established via an Ad Server Site.

Example:

For example, if an ad server A is selected in the campaign, only those media types that are assigned to the publisher via Ad Server Site can be selected in the placement.