See the details for the sample Esri service at that URL, which contains the line:

> Single Fused Map Cache: true

Verify that your own service also contains this line - chances are that it doesn't. In that case you need to build a cache using the instructions [here][1].

You'll then be able to display your data as a tiled layer.


  [1]: http://help.arcgis.com/en/arcgisserver/10.0/help/arcgis_server_dotnet_help/index.html#/Creating_map_cache_tiles/00930000006v000000/