A telecommunication switching network is described in which one or more competing local exchange carriers are to be provided with unbundled access to customer premises equipment though subscriber access lines. The customer premises equipment is comprised of user terminals and a customer premises equipment...http://www.google.com.hk/patents/US6118777?utm_source=gb-gplus-share專利 US6118777 - System and method for providing competing local exchange carriers unbundled access to subscriber access lines
