Abstract: A network element for a digital transmission network is proposed. The network element contains two switching matrices for switching data cells, as well as ingress ports that receive TDM traffic flow and packet traffic flow and segment the traffic flows into cells. A control system for controlling the configuration of the ingress ports and the switching matrices controls the ingress ports, in case of no failure of the switching matrices, to forward the TDM traffic flows to both switching matrices and to split the packet traffic flow over the two switching matrices.

Abstract: A network element for a digital transmission network is proposed. The network element contains two switching matrices for switching data cells, as well as ingress ports that receive TDM traffic flow and packet traffic flow and segment the traffic flows into cells. A control system for controlling the configuration of the ingress ports and the switching matrices controls the ingress ports, in case of no failure of the switching matrices, to forward the TDM traffic flows to both switching matrices and to split the packet traffic flow over the two switching matrices.

Abstract: A method for signalling of data transmission path properties is proposed. The method contains several steps at a first network endpoint device. As a first step, at least one data transmission path is provided via a client-server interface to a client device by the first network endpoint device. The data transmission path is a path through the network connecting the first network endpoint device and a second network endpoint device. As a second step, the first network endpoint device receives via a server-network interface OAM information generated by the second network endpoint device or internal network devices and terminates this received OAM information. As a third step, the first network endpoint device determines at least one data transmission property parameter from such received OAM information which was generated by the second network endpoint device or internal network devices.

Abstract: It is disclosed a method for monitoring traffic in a private VLAN, the traffic bidirectionally propagating across the private VLAN through a sequence of nodes sequentially connected by a primary VLAN and a secondary VLAN, the sequence of nodes comprising a first node and a second node, wherein the method comprises: transmitting a monitoring message from the first node to the second node either along the primary VLAN or the secondary VLAN, according to a first criterion based upon a type of the first node; receiving the monitoring message at the second node; and upon reception of the monitoring message at the second node, transmitting a reply message from the second node to the first node either along the primary VLAN or the secondary VLAN, according to a second criterion based upon a type of the second node and upon a VLAN different from the VLAN from which the monitoring message has been received.

Abstract: A method for creating an Operation Administration and Maintenance frame in an Ethernet/Transport Multi-Protocol Label Switch hybrid network. The method includes mapping values in an Ethernet Operation Administration and Maintenance data field in a protocol data unit (PDU) in a first Ethernet Operation Administration and Maintenance frame (Ethernet OAM frame) into a Transport Multi-Protocol Label Switch Operation Administration and Maintenance data field in PDU in a first Transport Multi-Protocol Label Switch Operation Administration and Maintenance frame (TMPLS OAM frame) and mapping values in first control parameter fields in the first Ethernet OAM frame into second control parameter fields in the first TMPLS OAM frame. The PDU in the first TMPLS OAM frame includes added extra fields as necessary, and the second control parameter fields further comprise preselected default information and routing information mapped from values stored in a memory.

Abstract: A method is described for enhancing a trail/path protection function in a SDH/SONET network, the network comprising a number of working resources and a number of protection resources and transmitting signal frames having a section overhead in SDH technology, or a Line OverHead in SONET technology, and a POH, said protection function comprising linear MSP N:1 trail protection function based on transmission of protection information through K1 and K2 bytes of Section OverHead in SDH or Line OverHead in SONET, wherein the method further comprises the step of mapping the content of said K1 and K2 bytes by protocol exchange into POH bytes of the path overhead in SDH or SONET, at Low Order and/or High Order level, so as to allow the handling of more than one protecting resource shared among different working resources, both in end-to-end handling and in intermediate handling.

Abstract: A method for creating an Operation Administration and Maintenance frame in an Ethemet/Transport Multi-Protocol Label Switch hybrid network. The method includes mapping values in an Ethernet Operation Administration and Maintenance data field in a protocol data unit (PDU) in a first Ethernet Operation Administration and Maintenance frame (Ethernet OAM frame) into a Transport Multi-Protocol Label Switch Operation Administration and Maintenance data field in PDU in a first Transport Multi-Protocol Label Switch Operation Administration and Maintenance frame (TMPLS OAM frame) and mapping values in first control parameter fields in the first Ethernet OAM frame into second control parameter fields in the first TMPLS OAM frame. The PDU in the first TMPLS OAM frame includes added extra fields as necessary, and the second control parameter fields further comprise preselected default information and routing information mapped from values stored in a memory.

Abstract: It is disclosed a method for monitoring traffic in a private VLAN, the traffic bidirectionally propagating across the private VLAN through a sequence of nodes sequentially connected by a primary VLAN and a secondary VLAN, the sequence of nodes comprising a first node and a second node, wherein the method comprises: transmitting a monitoring message from the first node to the second node either along the primary VLAN or the secondary VLAN, according to a first criterion based upon a type of the first node; receiving the monitoring message at the second node; and upon reception of the monitoring message at the second node, transmitting a reply message from the second node to the first node either along the primary VLAN or the secondary VLAN, according to a second criterion based upon a type of the second node and upon a VLAN different from the VLAN from which the monitoring message has been received.

Abstract: Described is a method for managing the traffic protection in OMS-SPRING networks and allowing the wavelength allocation change in the traffic transit nodes. The method of managing the traffic protection in an OMS-SPRING network should a span of the path fail is characterized in that it comprises the steps of providing a wavelength interchange mechanism; performing a ring Span Switch action by the OMS-SP mechanism; and re-routing the wavelength interchanged path on the protecting wavelength corresponding to the working wavelength of the span affected by a failure.

Abstract: A method of managing time slot interchange in transoceanic MS-SPRING networks. The method, in case of ring failure in a single span of the path installed in a transoceanic MS-SP RING with Time Slot Interchange (TSI) mechanism, comprises the step of carrying out a ring switch action by the MS-SP mechanism, and is characterized by comprising the step of re-routing the path in the time slot of the low-priority channels corresponding to the time slot of the high-priority channels of the failured span. The method according to the invention further provides for the managing of double-failure or multi-failure cases resulting in one or more nodes being isolated.

Abstract: A method is described for enhancing a trail/path protection function in a SDH/SONET network, the network comprising a number of working resources and a number of protection resources and transmitting signal frames having a section overhead in SDH technology, or a Line OverHead in SONET technology, and a POH, said protection function comprising linear MSP N:1 trail protection function based on transmission of protection information through K1 and K2 bytes of Section OverHead in SDH or Line OverHead in SONET, wherein the method further comprises the step of mapping the content of said K1 and K2 bytes by protocol exchange into POH bytes of the path overhead in SDH or SONET, at Low Order and/or High Order level, so as to allow the handling of more than one protecting resource shared among different working resources, both in end-to-end handling and in intermediate handling.

Abstract: It is disclosed a method for in-band path failure detection localization in a SDH/SONET network, the network comprising at least one network domain, the method comprises the steps of defining at least one path (PATH) through which SDH/SONET frames are transmitted and is characterized by coding K3 byte of POH, for SDH technology, or coding the Z4 byte of STS1 POH, for SONET technology. Bits 1-6 of byte K3 or Z4 are coded for providing: a node identifier indicating a node detecting a failure; Remote Defect Indication information; and information relating to the fact that a failure is external or internal to a network domain.

Abstract: Described is a method for managing the traffic protection in OMS-SPRING networks and allowing the wavelength allocation change in the traffic transit nodes. The method of managing the traffic protection in an OMS-SPRING network should a span of the path become failured is characterized in that it comprises the steps of providing an wavelength interchange mechanism; performing a ring Span Switch action by the OMS-SP mechanism; and re-routing the wavelength interchanged path on the protecting wavelength corresponding to the working wavelength of the span affected by a failure.

Abstract: A method of managing the change of time slot allocation in classical MS-SP ring networks. In two-fiber rings, the criterion for choosing the low priority AU-4 to be used for the protection in case of simple failure can be summarized as follows: given an STM-n ring line signal, where “n” is the overall number of the handled channels, there results that LP AU-4#XLP=AU-4#(XHP+n/2), where X is the HP AU-4 index in the failured span. In four-fiber rings, AU-4 LP=AU-4#X HP. Should two or more failures occur, criteria are provided for selecting one of the failured spans and tracing the problem back to the case of single two/four fiber ring failure.

Abstract: A method of managing time slot interchange in transoceanic MS-SPRING networks. The method, in case of ring failure in a single span of the path installed in a transoceanic MS-SP RING with Time Slot Interchange (TSI) mechanism, comprises the step of carrying out a ring switch action by the MS-SP mechanism, and is characterized by comprising the step of re-routing the path in the time slot of the low-priority channels corresponding to the time slot of the high-priority channels of the failured span. The method according to the invention further provides for the managing of double-failure or multi-failure cases resulting in one or more nodes being isolated.

Abstract: A method is described for protecting the traffic in a fiber optic telecommunications network, said network being of linear type and comprising at least two nodes connected by one or more spans comprising in turn working fiber and protection fiber. The method being characterized by adopting a distributed protection mechanism of the MS-SPRING type for closed-ring networks. In order to obtain all the functionalities of the protocols for linear networks, all at the nodes are instructed to disregard any command or ring failure through a Lockout of Working Channels-Ring command.