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    • 45. 发明申请
    • Method and apparatus for accommodating multiple optical segments in an Ethernet passive optical network
    • 用于在以太网无源光网络中容纳多个光纤段的方法和装置
    • US20060257149A1
    • 2006-11-16
    • US11130731
    • 2005-05-16
    • Ryan HirthEdward BoydHoa Phan
    • Ryan HirthEdward BoydHoa Phan
    • H04J14/00
    • H04J14/02H04B10/272
    • One embodiment of the present invention provides a system that accommodates multiple optical segments in an Ethernet passive optical network (EPON), wherein the EPON includes a central node and a number of remote nodes, and wherein the remote nodes reside in a number of optical segments. During operation, the system transmits downstream data from the central node to the remote nodes by broadcasting the data to the optical segments. In addition, the system selectively allows an optical segment to communicate with the central node during an upstream transmission period assigned to a remote node residing in that optical segment, thereby accommodating multiple optical segments and hence an increased number of remote nodes within the EPON.
    • 本发明的一个实施例提供了一种在以太网无源光网络(EPON)中容纳多个光纤段的系统,其中EPON包括中央节点和多个远程节点,并且其中远程节点驻留在多个光纤段 。 在运行期间,系统通过将数据广播到光段,从中央节点向远程节点发送下行数据。 此外,该系统选择性地允许光学段在分配给驻留在该光学段中的远程节点的上行传输周期期间与中央节点进行通信,由此容纳多个光段,并因此容纳EPON内的远程节点的数量增加。
    • 48. 发明申请
    • Method and apparatus for dynamically allocating upstream bandwidth in passive optical networks
    • 在无源光网络中动态分配上行带宽的方法和装置
    • US20050047783A1
    • 2005-03-03
    • US10930336
    • 2004-08-30
    • John SistoEdward Boyd
    • John SistoEdward Boyd
    • H04L12/56H04Q11/00H04J14/00
    • H04L47/27H04L47/15H04L47/22H04L47/2425H04L47/36H04L47/70H04L47/745H04L47/788H04L47/808H04Q11/0066H04Q11/0067H04Q2011/0064
    • One embodiment of the present invention provides a system that facilitates dynamic allocation of upstream bandwidth in a passive optical network which includes a central node and at least one remote node. Each remote node is coupled to at least one logical entity and includes a number of queues, each of which is associated with a logical entity and stores upstream data from the logical entity. The central node is coupled to an external network through a shared out-going uplink. During operation, the system receives a request from a remote node for a grant to transmit upstream data from a logical entity, wherein the request reports the state of a queue associated with a logical entity; wherein the size of the data to be transmitted does not exceed a transmission threshold assigned to that logical entity, and wherein a logical entity may not request more than what is allowed by the corresponding transmission threshold. If the request satisfies a bandwidth allocation policy, the system issues a grant to the remote node to transmit upstream data. In response to the grant, the system receives upstream data from the remote node. Next, the system transmits the received upstream data to the out-going uplink according to a set of SLAs.
    • 本发明的一个实施例提供了一种有助于在包括中央节点和至少一个远程节点的无源光网络中动态分配上行带宽的系统。 每个远程节点耦合到至少一个逻辑实体并且包括多个队列,每个队列与逻辑实体相关联并且存储来自逻辑实体的上行数据。 中央节点通过共享的外部上行链路耦合到外部网络。 在操作期间,系统从远程节点接收用于从逻辑实体发送上行数据的许可的请求,其中所述请求报告与逻辑实体相关联的队列的状态; 其中要发送的数据的大小不超过分配给该逻辑实体的传输阈值,并且其中逻辑实体可以不超过相应的传输阈值允许的请求。 如果请求满足带宽分配策略,则系统向远程节点发出授权以发送上行数据。 响应于授权,系统从远程节点接收上游数据。 接下来,系统根据一组SLA将接收到的上行数据发送到前进上行链路。
    • 49. 发明授权
    • Method and apparatus for time synchronization in a communication system
    • 通信系统中时间同步的方法和装置
    • US06449291B1
    • 2002-09-10
    • US09199030
    • 1998-11-24
    • Lawrence M. BurnsEdward Boyd
    • Lawrence M. BurnsEdward Boyd
    • H04J306
    • H04L12/2801H04J3/0655H04L47/28
    • A method and apparatus for time synchronization in a communications system such as a system including cable modems is provided. The synchronization method comprises the steps of receiving a first timestamp from a headend unit with the cable modem, and generating a first cable modem time reference with the cable modem in response to the receipt of the first timestamp. The cable modem then receives a second timestamp from the headend unit and generates a second cable modem time reference in response to the receipt of the second timestamp. A headend difference time comprising the difference of the first and second timestamps is then generated as is a cable modem difference time comprising the difference of the first and second cable modem time references. A clock error time that comprises the difference of the headend difference time and the cable modem difference time is then generated as well as a correction factor in response to the clock error time. The local clock of the cable modem is then synchronized with the master clock of the headend unit through the adjusting of the output of the local clock output in response to the correction factor. The correction factor in one instance comprises an offset value representative of the amount of clock error per local clock pulse. This offset value is added to an accumulator on each local clock pulse, and the local clock output is adjusted when the accumulator rolls over. The synchronized clock signal can then be utilized to determine a time slot in which the cable modem can transmit an upstream signal to the headend without colliding the upstream signal with upstream signals from other modems in the system.
    • 提供了一种用于诸如包括电缆调制解调器的系统的通信系统中的时间同步的方法和装置。 所述同步方法包括以下步骤:从所述电缆调制解调器的头端单元接收第一时间戳,以及响应于接收到所述第一时间戳,与所述电缆调制解调器生成第一电缆调制解调器时间参考。 电缆调制解调器然后从头端单元接收第二时间戳,并且响应于接收到第二时间戳而产生第二电缆调制解调器时间基准。 然后产生包括第一和第二时间戳的差的前端差时间,以及包括第一和第二电缆调制解调器时间基准的差异的电缆调制解调器差分时间。 然后产生包括前端差时间和电缆调制解调器差时间的差的时钟错误时间以及响应于时钟错误时间的校正因子。 然后电缆调制解调器的本地时钟通过响应于校正因子调整本地时钟输出的输出而与前端单元的主时钟同步。 一个实例中的校正因子包括表示每个本地时钟脉冲的时钟误差量的偏移值。 该偏移值被加到每个本地时钟脉冲的累加器上,当累加器翻转时,调整本地时钟输出。 然后可以利用同步的时钟信号来确定电缆调制解调器可以向前端发送上行信号的时隙,而不会使上游信号与系统中其他调制解调器的上行信号相冲突。