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    OPTICAL RING NETWORK HAVING ENHANCED SECURITY AND REDUCED LOSS
    21.
    发明专利
    OPTICAL RING NETWORK HAVING ENHANCED SECURITY AND REDUCED LOSS 未知

    公开(公告)号：CA2311144A1

    公开(公告)日：2000-12-15

    申请号：CA2311144

    申请日：2000-06-02

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ADAMS LAURA ELLEN ,  BROBERG ROBERT MARIO ,  ANDERSON JON

    IPC: H04B10/20 ,  H04B10/02 ,  H04B10/2581 ,  H04J14/00 ,  H04J14/02 ,  H04L12/42

    Abstract: A fiber-optic WDM ring carries communication traffic among a plurality of nodes, each node associated with respective subscriber premises. The WDM ring includes an optical add-drop module (OADM) at each node for adding and dropping signals associated with that node. The WDM ring also includes active terminal equipment at each node for conditioning incoming and outgoing data and for converting between the optical and electrical domains. The OADM at each of at least some nodes, to be referred to as enhanced nodes, is situated at a site physically separated from the powered terminal equipment, and is coupled to the powered terminal equipment via an optical medium. At each enhanced node, traffic not destined for that node is routed through no more than one enclosure on subscriber premises that requires a connection. If there is such enclosure, it contains the OADM.

    ASYNCHRONOUS TRANSFER MODE (ATM) CONNECTION PROTECTION SWITCHING APPARATUS AND METHOD
    24.
    发明专利
    ASYNCHRONOUS TRANSFER MODE (ATM) CONNECTION PROTECTION SWITCHING APPARATUS AND METHOD 未知

    公开(公告)号：CA2207538A1

    公开(公告)日：1998-02-06

    申请号：CA2207538

    申请日：1997-06-11

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： NEWTON CURTIS J ,  NOH TAI H ,  ANDERSON JON

    IPC: H04Q3/00 ,  H04L12/56 ,  H04Q11/04

    Abstract: A Virtual Path Group (VPG) technique that utilizes network elements (NEs), i .e.,nodes, that are visible to ATM specific defects, and allows for fast ATM virtualconnection/restoration with a minimum of process ing. This is realized by employing a Virtual Path Group transport architecture comprises at least one (1) working route, one (1) protection route, and VPG bridge and selector functions at each end of t he routes. It is applicable to 1+1, mesh and ring protection switching and is extensible t o any virtual connection segment or end-to-end network (cross-subnetwork) virtual connecti ons, and extensible to 1:1 and M:N protection switching. Additionally, the protection switching arrangement of the invention includes an architecture for the Virtual Path G roup (VPG) concept in which the associations among individual ATM virtual channels (VP/ VCs) and VPGs are maintained entirely within the network element management function. This allows VPG support to be added to ATM systems and networks with minimum chan ge from current ATM standards. In particular, no changes are required to the Vi rtual Path Identifier/Virtual Channel Identifier (VPI/VCI) addresses carried within eac h ATM cell across ATM interfaces. Further, defect type indication is realized via a new , for example a F4, segment level Operation and Maintenance (OAM) cell, to initiate the appr opriate restoration action downstream. The technique differentiates between physical layer and ATM layer defects. An algorithm is employed in an embodiment of the inventio n todetermine appropriate VPG protection switch and sign aling actions, driven by the F4 defect type OAM cells. Moreover, for interworking with physical layer protec tion (e.g. SONET Bi-Directional Line Switched Ring (BLSR)), a VPG protection holdoff fu nction is employed at the VPG protection selector. A technical advantage of this pr otection switching invention is that it provides extremely fast protection switching of an extremely large number of ATM virtual connections.

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