A loopback cell control system includes ATM apparatuses and forward and backward paths and serves to perform a loopback test by circulating a loopback cell through a route in an ATM network once. Each ATM apparatus includes a time managing section, a loopback control section, and a route delay measuring...http://www.google.fr/patents/US6023455?utm_source=gb-gplus-shareBrevet US6023455 - Loopback cell control system
