Open Street Map Rest endpoint

I can't find where the coding is for this to make it the default street map in my config file; similar to what's below. Any help?

<layer type="tiled" label="Streets" icon="https://www.arcgis.com/sharing/rest/content/items/d8855ee4d3d74413babfb0f41203b168/info/thumbnail/tempstreets.jpg" url="http://services.arcgisonline.com/ArcGIS/rest/services/Street_Map/MapServer" visible="true"/>