Motorola SB5102, but it has nothing to do with the problem. The problem is the 615.
I have a lot of equipment (nas, pap2t, server, printer) in the basement at the point of entry for all my utilities. I'm well aware of the need to have a wireless AP on the main floor, which is how I wound up with the 645 in the first place. The 1525 is not sold locally and the 645 was the next best thing.
I'm also not willing to rip open my walls and ceilings to run a parallel cat5/6 cable to bring the ISP to the main floor for the 645, then right back down to the equipment room in the basement. My entire house is already wired to connect to the ISP entry point and creating a spaghetti mess of redundant wiring is not a solution. If I've learned anything in my 25 years with IBM its to KISS.
And in the end you're basically saying what I am.... that I need to spend more money to make this DLink-based infrastructure work the way it should have from the beginning. The 615 is barely a year old as I was forced to replace a DLink router that burned out after 10 good years of service. So I've already spent ~$150 on two routers and a Gb switch within the past 12 months, and the only solution seems to be keep throwing good money after bad.
I apologize for my tone, but this is frustrating and ridiculous. We build new infrastructure off old all the time in my work place, and if we had to upgrade the old infrastructure every time we implemented a new business solution, our clients would drop us faster than my 615 is dropping packets.