Convincing operators and vendors of the benefits brought about by a multi-technology, open approach has been a difficult task for those pushing the development and adoption of particular network technologies, but there was an air of change arriving at Broadband World Forum (BBWF) in Berlin this week. Faultline Online Reporter attended an event hosted by US network equipment vendor Adtran, which discussed a mixed bag of network technologies, but what stood out was that every single presentation throughout the day mentioned a multi-vendor approach. This was refreshing to see from a vendor, as the benefits of using technologies from multiple sources is more obvious from the point of view of a large operator. Meanwhile, one of Adtran’s key European rivals,…