This might be of interest to those wishing to dive deeper into the subject.
Telecommunications Handbook for Transportation Professionals: The Basics of Telecommunications by the Federal Highway Administration. http://ops.fhwa.dot.gov/publications/telecomm_handbook/ I'm still digging through it to see what they say about network security. -- Joe Hamelin, W7COM, Tulalip, WA, 360-474-7474
