Systems and methods for synchronizing time stamp counters of ports in a domain and for starting, stopping and triggering the ports in the domain at substantially the same time. A master box is connected with at least one slave box and the ports on the connected boxes are logically grouped in domains....http://www.google.com/patents/US6941482?utm_source=gb-gplus-sharePatent US6941482 - Systems and methods for synchronizing time stamps
