It's a Motorola SmartZone system so it has all the inherent features associated with SmartZone. So yes to all sites being linked. Also, due to its size and restrictions set on radio ids and talkgroups you can't hear everything everywhere. You may want to research SmartZone to get a better idea.
The system can be heard through 75% of California from the Central California Valley down to Southern Orange County, and out East toward Las Vegas.
-Wayne