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FACT: Luminous's version of RPR is INCOMPATIBLE with existing SONET ADM's making it a requirement that carriers deploy an end-to-end luminous RPR solution. Nortel allows you to use RPR at the edge and transport it across a service providers "legacy" SONET infrastructure. Cisco introduced DPT to help ISPs that didn't have a SONET infrastructure deploy a resilient transport medium.
Ringed? point is a valid one - and by your reaction you just proved it was correct; luminous is caught between a rock and a hard spot (NT & Cisco), and the partnership with SA just proves it - SA can't make data transport equipment and luminous can't break into the MSO space on its RPR merits alone.
Prove to me that the luminous solution is better than Nortels! Let's say that I am a carrier that has been buying NT SONET gear for years - how are you going to sell luminous into that environment?
Let's take MSO's - I am already using CSCO CMTS gear for distribution and CSCO catalyst switches for GE transport for VoD.... Again, how do you plan on selling into that space?
As far as interoperability goes, I have not heard of any real interoperability between vendors as of yet... Eventually it will happen, and even CSCO will have to follow suite.
A piece of advice for you, luminous guy - no one likes a bitter loser who posts garbage without substance. The reality is that there are MUCH better RPR choices out there other than luminous being manufactured by vendors who have MUCH more credibility.