With digitalspace's question answered, the next question is how does VM load balance so that UBR's provide a roughly equal service?
Indeed this is a tough one because different locales may have different use profiles and I doubt that VM re-allocate individual users to different UBRs according to usage profile.
This, in turn, means there's pretty well a postocode lottery as per
http://www.cableforum.co.uk/board/12...over-then.html.
Not good.