I'm extremely suprised that this is their stance. I'm pressed to find a
technical reason behind such a requirement. The 7000 is a Motorola 68XXX
based system, and the 4500/4700 is a risc based system. There have been
performance tests that have shown that the 45/47 boxes out perform the
7000 boxes. I'd be very interested in hearing Sprints' reasoning on this.
And don't even THINK about using a 75xx! 
? On another subject, does anyone know of a source showing the
hardware/software of choice at different NAPs?
It would be interesting to see what percent is Cisco (>90%), Bay,
*BSD, and etc....
-alan