Never did find out what was wrong. We changed out one of the Netgear 10/100 switches for a configurable Gigabit switch and eventually they all came online, but not all at the same time, some of them required a power cycle. But we still had 4 of them on an identical Netgear switch and they started working. Also we changed the serial side down to 9600 baud, but I can't imagine that the serial side would prevent the TCP/IP side from working, would it?

Cheers,

Kevin