Abstract: A method and a system are provided for data management in a transport device, in particular in a train. In a first comparison, a first count value stored in a first control device is compared with a count value stored in a second control device. In a second comparison, a count value selected from the first and second count values on the basis of a result of the first comparison is compared with a control count value stored in a safety device. On the basis of a result of the second comparison, control data stored in the safety device and associated with the control count value are acquired by the first or second control device.

Abstract: The embodiments of the invention relate to a line switching component separable from a line card of a network node. The line switching component contains at least one input port for receiving an optical input signal from an optical transport network and at least one output port for transmitting an optical output signal to the optical transport network. The line switching component further contains at least one further output port configured to be connected to an input port of at least one optical interface of the line card and at least one further input port configured to be connected to an output port of the at least one further optical interface of the line card. The line switching component further contains a switchable optical path system configured to operate the line switching component in a first operation mode and to operate the line switching component in a second operation mode.

Abstract: The embodiments of the invention relate to a line switching component separable from a line card of a network node. The line switching component contains at least one input port for receiving an optical input signal from an optical transport network and at least one output port for transmitting an optical output signal to the optical transport network. The line switching component further contains at least one further output port configured to be connected to an input port of at least one optical interface of the line card and at least one further input port configured to be connected to an output port of the at least one further optical interface of the line card. The line switching component further contains a switchable optical path system configured to operate the line switching component in a first operation mode and to operate the line switching component in a second operation mode.

Abstract: A network node, which is designed for switching of time-division multiplex signals; contains a number of line cards (LCI-LCn), a switch fabric (SF) interconnecting the line cards (LCI-LCn), and a control system (CS). The switching fabric (SF) is a cell based switch with one or more switch modules (SET-SEn) adapted to switch cells of a predefined cell format on the basis of addresses contained in cell headers of the cells. The line cards (LCI-LCn) have segmentation and reassembly devices (SARI-SARn) for segmenting input time-division multiplex signals into cells of the preformed cell format and adding address information to each cell and for reassembling cells received from said switch fabric (SF) into output time-division multiplex signals. The control system (CS) is connected to a switched port of the switch fabric (SF) and exchanges with the line cards (LCI-LCn) control and/or Operation, Administration and Maintenance (OAM) messages over the switch fabric (SF) using cells of the preformed cell format.

Abstract: A delay measurement method of a path (P) or path segment through a transport network and a corresponding network nodes (NE1, NE2) for performing the delay measurement are described, which provide a higher precision and lower jitter. An originating network node (NE1) inserts a delay measurement request signal (REQ) into an overhead subfield of a first data unit and transmits the first data unit over the path (P) or path segment to a far-end network node (NE2) as part of framed transport signals. The far-end network node (NE2), upon detection of the delay measurement request (REQ), inserts a delay measurement reply signal (REP) into on overhead subfield of a second data unit and transmits the second data unit back to the originating network node (NE1) using framed transport signals in reverse direction. The originating network node (NE1) determines a time difference between insertion of the delay measurement request signal (REQ) and receipt of the delay measurement reply signal (REP).

Abstract: A network node, which is designed for switching of time-division multiplex signals; contains a number of line cards (LCI-LCn), a switch fabric (SF) interconnecting the line cards (LCI-LCn), and a control system (CS). The switching fabric (SF) is a cell based switch with one or more switch modules (SET-SEn) adapted to switch cells of a predefined cell format on the basis of addresses contained in cell headers of the cells. The line cards (LCI-LCn) have segmentation and reassembly devices (SARI-SARn) for segmenting input time-division multiplex signals into cells of the preformed cell format and adding address information to each cell and for reassembling cells received from said switch fabric (SF) into output time-division multiplex signals. The control system (CS) is connected to a switched port of the switch fabric (SF) and exchanges with the line cards (LCI-LCn) control and/or Operation, Administration and Maintennance (OAM) messages over the switch fabric (SF) using cells of the preformed cell format.

Abstract: The present invention relates to a control system of a network element (18) capable of handling transmission signals of an optical transport network (16) (OTN) and transmission signals of a synchronous digital transport network (16) (SDH), the network element (18) comprising a first subsystem (28) for handling trans-mission signals of the optical transport network (16), a second subsystem (30) for handling transmission signals of the synchronous digital transport network (16) and a number of dedicated interconnections (40) between the two subsystems (28, 30), wherein the control system comprises a management information base comprising managed objects (54) related to the first subsystem (28), managed objects (52) related to the second subsystem (30) and a further managed object (56) (interconnection object) related to the number of interconnections (40). The invention further relates to a network element comprising the control system and a method for managing the network element.

Abstract: A heterogeneous network consists of an OTN-type sub-network and an SDH type sub-network. The sub-networks are interconnected by an interconnection node network element (NE) which has a first interface (O1-On) connected to OTN-type sub-network (OTN) and a second interface (S1-Sn) connected the SDH-type sub-network (SDH). Management information messages from the data communication channels of received SDH signals and management information messages from the general communication channels of received OTN signals are extracted in the corresponding interfaces. All messages are then fed via a LAN to a common routing engine (R), which routes the management information messages between the OTN and SDH sub-networks.

Abstract: The present invention relates to a method of negotiating an active or a passive role assignment to a first and a second control means of a network element. The control means are redundant and operate dependent on their respective active or passive role. The invention furthermore relates to a control means therefor, a program module for a control means therefor and a network element therefor. The method comprises the steps of: determining an operability state parameter for each of said control means dependent on their respective ability to perform their respective functionality; mutually transmitting said operability state parameters between said control means; and determining an active role or a passive role by said control means dependent on said respective operability state parameters.