Abstract: A telecommunication appliance and method is described. In the method, a flexible cover part of an appliance cover of a telecommunication appliance supported by a telecommunication rack is removed while the telecommunication appliance is in service and passing data. The telecommunication appliance has a plurality of pluggable optical modules installed within connectors within a space encompassed by the appliance cover. The connectors are operably connected to a power supply supplying power to the connectors. When a first one of the connectors is devoid of a pluggable optical module being installed within the first one of the connectors, a first pluggable optical module is plugged into the first one of the connectors.

Abstract: Methods and systems are disclosed including a system comprising a first node, having a first transceiver comprising a first receiver and a first transmitter, comprising a tunable laser, configured to transmit a first optical signal on a first channel and to transmit a second optical signal on a second channel if the first receiver does not detect a third optical signal; a second node having a second transceiver comprising a second receiver and a second transmitter configured to transmit the third optical signal on the first channel if the second receiver detects the second optical signal; and a filter having ports configured to a particular bandwidth and to suppress the first optical signal if the first optical signal is not within the particular bandwidth of the port, and to transmit the second optical signal to the second node if the second optical signal is within the particular bandwidth.

Abstract: Methods and systems are disclosed including a system comprising a first node, having a first transceiver comprising a first receiver and a first transmitter, comprising a tunable laser, configured to transmit a first optical signal on a first channel and to transmit a second optical signal on a second channel if the first receiver does not detect a third optical signal; a second node having a second transceiver comprising a second receiver and a second transmitter configured to transmit the third optical signal on the first channel if the second receiver detects the second optical signal; and a filter having ports configured to a particular bandwidth and to suppress the first optical signal if the first optical signal is not within the particular bandwidth of the port, and to transmit the second optical signal to the second node if the second optical signal is within the particular bandwidth.

Abstract: Methods and systems are disclosed including a system comprising a first node, having a first transceiver comprising a first receiver and a first transmitter, comprising a tunable laser, configured to transmit a first optical signal on a first channel and to transmit a second optical signal on a second channel if the first receiver does not detect a third optical signal; a second node having a second transceiver comprising a second receiver and a second transmitter configured to transmit the third optical signal on the first channel if the second receiver detects the second optical signal; and a filter having ports configured to a particular bandwidth and to suppress the first optical signal if the first optical signal is not within the particular bandwidth of the port, and to transmit the second optical signal to the second node if the second optical signal is within the particular bandwidth.

Abstract: Methods and systems are disclosed including a system comprising a first node, having a first transceiver comprising a first receiver and a first transmitter, comprising a tunable laser, configured to transmit a first optical signal on a first channel and to transmit a second optical signal on a second channel if the first receiver does not detect a third optical signal; a second node having a second transceiver comprising a second receiver and a second transmitter configured to transmit the third optical signal on the first channel if the second receiver detects the second optical signal; and a filter having ports configured to a particular bandwidth and to suppress the first optical signal if the first optical signal is not within the particular bandwidth of the port, and to transmit the second optical signal to the second node if the second optical signal is within the particular bandwidth.

Abstract: The invention relates to a distributed radio access network communicatively coupled to a core network, and a method for upholding a service in case of a failure in the distributed radio access network. The distributed radio access network comprises a main radio equipment controller communicatively coupled to at least one remote radio unit over a main optical path, a backup radio equipment controller communicatively coupled to the main radio equipment controller for synchronization, and a protection optical path for communicatively coupling the at least one remote radio unit to the backup radio equipment controller in case of a failure in communication between the main radio equipment controller and the at least one remote radio unit over the main optical path such that a service remains running when the failure occurs.

Abstract: Embodiments of the present invention relate system and method for handling large dynamical signals in a passive optical network system and in particular for determining scheduling of bursts from a plurality of optical network units. More particularly, embodiments of the present invention relate to a system and method for determining a bit error ratio, i.e. BER in received communication data, determining, using the BER, optimized transmission scheduling of communication bursts from the optical network units, and providing a signal to the optical network units indicating the transmission scheduling of transmission bursts in accordance with the determined optimized transmission scheduling.

Abstract: A method and apparatus for controlling DC balance in a digital communication system in which data frames are transmitted, wherein the data frames include a header portion that is transmitted unscrambled and a payload portion that is scrambled before transmission. The header portion includes a frame counter field. A value for the frame counter field is randomly generated and an effect on the DC balance is estimated. It is then determined whether the estimated effect on the DC balance meets defined requirements for DC balance. When the estimated effect does not meet the defined requirements for DC balance, a new random value for the frame counter field is generated and checked. When the estimated effect meets the requirements, the randomly generated value is utilized in the frame counter field in transmitted data frames.

Abstract: A control device (13) for scheduling the transmission of signals from a plurality of transmitters (14, 15, 16, 17, 18, 19, 20, 21). The control device (13) comprises an evaluation element (22) arranged to determine the power level of the signals received from each of the transmitters and a scheduling element (23) adapted to determine a transmit schedule comprising the order that the plurality of transmitters should transmit based on the power levels of the signals received from the transmitters (14, 15, 16, 17, 18, 19, 20, 21). A method of operation and a node incorporating the control device is also disclosed.

Abstract: An Optical Network Unit, ONU, and an Optical Line Terminal, OLT, as well as a respective method therein, are provided for enabling the ONU to communicate with the OLT. The ONU and at least one OLT are comprised in a passive fibre optic access network. The passive fibre optic access network comprises two fibre paths through the network, a main fibre path and a back-up fibre path, connecting the ONU with the OLT. When a fault is detected in the main fibre path is detected, transmission rate negotiation is performed between the ONU and the OLT over the back-up path. When a transmission rate is agreed upon between the ONU and the OLT during said transmission rate negotiation with regard to communication over the back-up path, the communication between the ONU and the OLT is executed using the agreed transmission rate over the back-up path.

Abstract: A first end terminal and a second end terminal, as well as a respective method therein, are provided for enabling communication between the first end terminal and the second end terminal in a fibre optic access network. When the first and the second end terminal wish to communicate with each other, they first initiate a synchronisation procedure with the other end terminal for synchronising the two terminals with each other and enabling them to start a negotiation procedure. Then they perform the negotiation procedure, which pertains to a transmission rate for communication on the fibre link between the two end terminals, and they execute communication to the other end terminal employing the negotiated transmission rate.

Abstract: The invention relates to a distributed radio access network communicatively coupled to a core network, and a method for upholding a service in case of a failure in the distributed radio access network. The distributed radio access network comprises a main radio equipment controller communicatively coupled to at least one remote radio unit over a main optical path, a backup radio equipment controller communicatively coupled to the main radio equipment controller for synchronization, and a protection optical path for communicatively coupling the at least one remote radio unit to the backup radio equipment controller in case of a failure in communication between the main radio equipment controller and the at least one remote radio unit over the main optical path such that a service remains running when the failure occurs.

Abstract: A method and apparatus for controlling DC balance in a digital communication system in which data frames are transmitted, wherein the data frames include a header portion that is transmitted unscrambled and a payload portion that is scrambled before transmission. The header portion includes a frame counter field. A value for the frame counter field is randomly generated and an effect on the DC balance is estimated. It is then determined whether the estimated effect on the DC balance meets defined requirements for DC balance. When the estimated effect does not meet the defined requirements for DC balance, a new random value for the frame counter field is generated and checked. When the estimated effect meets the requirements, the randomly generated value is utilized in the frame counter field in transmitted data frames.

Abstract: Embodiments of the present invention relate system and method for handling large dynamical signals in a passive optical network system and in particular for determining scheduling of bursts from a plurality of optical network units. More particularly, embodiments of the present invention relate to a system and method for determining a bit error ratio, i.e. BER in received communication data, determining, using the BER, optimized transmission scheduling of communication bursts from the optical network units, and providing a signal to the optical network units indicating the transmission scheduling of transmission bursts in accordance with the determined optimized transmission scheduling.

Abstract: A control device (13) for scheduling the transmission of signals from a plurality of transmitters (14, 15, 16, 17, 18, 19, 20, 21). The control device (13) comprises an evaluation element (22) arranged to determine the power level of the signals received from each of the transmitters and a scheduling element (23) adapted to determine a transmit schedule comprising the order that the plurality of transmitters should transmit based on the power levels of the signals received from the transmitters (14, 15, 16, 17, 18, 19, 20, 21). A method of operation and a node incorporating the control device is also disclosed.

Abstract: It is an object of the present invention to provide switching equipment for communications networks, which switching equipment supports high-speed signalling between switch cards and line cards. Hence, the invention relates to a switching device for communications networks comprising a plurality of line cards and at least one switch card. The line cards comprise connection means arranged on or close to one edge of each line card, and the at least one switch card comprises matching connection means arranged on one flat side of said switch card. In this way, when said switch card is arranged substantially perpendicular to said line cards with said flat side of the switch card facing and at least partially overlapping said edges of the line cards, interconnection is achieved between the connection means of the line cards and the matching connection means of the at least one switch card.