This application should not be allowed in Amateur Radio service, because it's being used as part of a business or government operation.
The piece of spectrum this system actually uses, since it is shared with their maintenance radio fleet, is definitely not part of any amateur service allocation ("band")
The term 'packet radio' also implies (to me anyway) certain kinds of applications and messages, which don't apply to a system like this. Anyway, if there was some kind of IP or other routable protocol on the air here, that would be overdoing it. The messages probably look more like what you'd find on a multidrop serial bus, with elements including source and destination address, length, payload, checksum. A bunch of FSK modems working on the same radio channel is not much different to a multidrop serial bus.
The piece of spectrum this system actually uses, since it is shared with their maintenance radio fleet, is definitely not part of any amateur service allocation ("band")
The term 'packet radio' also implies (to me anyway) certain kinds of applications and messages, which don't apply to a system like this. Anyway, if there was some kind of IP or other routable protocol on the air here, that would be overdoing it. The messages probably look more like what you'd find on a multidrop serial bus, with elements including source and destination address, length, payload, checksum. A bunch of FSK modems working on the same radio channel is not much different to a multidrop serial bus.