Describes the relative positions of different players, or their products, in the supply of broadband. The most 'upstream' provider is the one that sells the most basic product (for example copper or fibre access). Players who are 'downstream' of this are those that buy this basic product, add their own elements (for example their own electronic equipment to the end of copper links). These are often called wholesale providers. Further 'downstream' still are players who buy these 'wholesale' products, add their own branding, billing and customer services, and sell them on to customers. In practice, one company may do all three stages above, either explicitly or implicitly (for example Virgin Media or BT).