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    Distributing clock synchronization information within an optical communications network
    2.
    发明授权
    Distributing clock synchronization information within an optical communications network 有权

    公开(公告)号：US09871648B2

    公开(公告)日：2018-01-16

    申请号：US15449792

    申请日：2017-03-03

    Applicant: Telefonaktiebolaget L M Ericsson (publ)

    Inventor： Sergio Lanzone ,  Stefano Ruffini ,  Orazio Toscano

    IPC: H04B10/00 ,  H04L7/00 ,  H04J3/06 ,  H04J3/16

    CPC classification number: H04L7/0075 ,  H04J3/065 ,  H04J3/0667 ,  H04J3/0673 ,  H04J3/1652

    Abstract: A method distributes clock synchronization information within an optical communications network that includes a plurality of network elements. The method receives an ingress clock synchronization message at a first network element. The ingress clock synchronization message includes a clock synchronization message identifier and a correction field. The clock synchronization message identifier is inserted into an optical channel frame overhead and the ingress clock synchronization message is inserted into an optical channel frame payload. The optical channel frame overhead and the optical channel frame payload are transmitted across the first network element, across the network to a second network element, and across the second network element. A transit time of the clock synchronization message identifier is determined across each of the network elements. At the second network element, the correction field of the ingress clock synchronization message is updated with the transit times to form an egress clock synchronization message.

    Protection for optical transport network with dual homed attachment circuits
    4.
    发明授权
    Protection for optical transport network with dual homed attachment circuits 有权

    公开(公告)号：US09774387B2

    公开(公告)日：2017-09-26

    申请号：US14762732

    申请日：2013-01-25

    Applicant: Telefonaktiebolaget L M Ericsson (publ)

    Inventor： Sergio Lanzone ,  Andrea Corti ,  Annamaria Fulignoli

    IPC: H04B10/00 ,  H04B10/032 ,  H04B10/27 ,  H04J3/14

    CPC classification number: H04B10/032 ,  H04B10/27 ,  H04J3/14 ,  H04J2203/0028 ,  H04J2203/006

    Abstract: For protecting traffic on paths extending from a source client entity (CE1) to a destination client entity (CE2) via an optical transport network and attachment circuits at ingress (A,B) and egress (C,D) nodes, there are multiple paths within the OTN network, and the attachment circuits are dual homed. By sending (120) an indication of operational status of the dual homed attachment circuits within overhead associated with the traffic and sent with the traffic through the network, a selection can be made (130) of which of the provided paths and attachment circuits to use for the traffic, based on the indicated operational status, and on OTN fault detection, to protect against a fault in the attachment circuit or in the OTN network. Thus protection can extend across the edge nodes without the complexity and delays involved in interworking of separate protection schemes and without a control plane.

    Communications network using adaptable FEC
    5.
    发明授权
    Communications network using adaptable FEC 有权
    通信网络采用适应性FEC

    公开(公告)号：US09537607B2

    公开(公告)日：2017-01-03

    申请号：US14981743

    申请日：2015-12-28

    Applicant: Telefonaktiebolaget L M Ericsson (publ)

    Inventor： Sergio Lanzone ,  Ghani Abdul Muttalib Abbas ,  Orazio Toscano

    IPC: H03M13/00 ,  H04L1/00 ,  H04L1/20 ,  H04J14/02 ,  H04B10/079

    CPC classification number: H04L1/0041 ,  H04B10/07953 ,  H04J14/0212 ,  H04J14/0221 ,  H04J14/0273 ,  H04J2203/006 ,  H04J2203/0089 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0045 ,  H04L1/203

    Abstract: A node for a communications network has a converter for digitizing at a receiver clock rate a received optical signal received over an optical link from an optical transmitter at a source node, a framer for detecting frames and a forward error correction part for correcting errors in the payload of the frame. An error rate in the received payload part is monitored and a processor sends, according to the monitored error rate, a request to the optical transmitter to adapt a length of the transmitted forward error correction part and to adapt a clock rate of the transmission of the frame if FEC length is reduced or FEC is disabled. This can enable power saving, when less FEC information is being sent.

    Abstract translation: 用于通信网络的节点具有转换器，用于以接收机时钟速率对来自源节点处的光发送器的光链路接收的光信号进行数字化，用于检测帧的成帧器和用于校正错误的前向纠错部分 帧的有效载荷。 监视接收到的有效载荷部分中的错误率，并且处理器根据所监视的错误率向光发射机发送一个适配所发送的前向纠错部分的长度的请求，并且调整发送的前向纠错部分的时钟速率 如果FEC长度减少或FEC被禁用，则为帧。 当发送较少的FEC信息时，可以实现省电。

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