An access server and a DSLAM are continuously connected by a PVC. The access server and the DSLAM manage an unused ATM VC within the PVC while making a communication with an idle VC indication cell which is an OAM cell. The DSLAM allocates the unused ATM VC by communicating with the access server based...http://www.google.com/patents/US6529479?utm_source=gb-gplus-sharePatent US6529479 - SVC accessing method for use in ATM-DSLAM
