WO2011103831A2 - 通信网络系统中的时钟信号传递方法及通信网络系统 - Google Patents

通信网络系统中的时钟信号传递方法及通信网络系统 Download PDF

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Publication number
WO2011103831A2
WO2011103831A2 PCT/CN2011/072940 CN2011072940W WO2011103831A2 WO 2011103831 A2 WO2011103831 A2 WO 2011103831A2 CN 2011072940 W CN2011072940 W CN 2011072940W WO 2011103831 A2 WO2011103831 A2 WO 2011103831A2
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Prior art keywords
clock signal
communication device
communication
transmission
communications device
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PCT/CN2011/072940
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English (en)
French (fr)
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WO2011103831A3 (zh
Inventor
张�杰
张勇
刘建根
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华为技术有限公司
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Priority to CN2011800004238A priority Critical patent/CN102177675A/zh
Priority to PCT/CN2011/072940 priority patent/WO2011103831A2/zh
Publication of WO2011103831A2 publication Critical patent/WO2011103831A2/zh
Publication of WO2011103831A3 publication Critical patent/WO2011103831A3/zh

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    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K5/00Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/13Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals
    • H03K5/135Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals by the use of time reference signals, e.g. clock signals
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/04Generating or distributing clock signals or signals derived directly therefrom
    • G06F1/10Distribution of clock signals, e.g. skew
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0685Clock or time synchronisation in a node; Intranode synchronisation

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a clock signal transmission method and a communication network system in a communication network system. Background technique
  • the communication system may include a plurality of communication nodes, and the data communicated with each other may be transmitted by a serializer/deserializer (SerDes, SDS for short).
  • SDS has two types of interfaces, one is based on the source synchronous (SS) protocol interface, and the other is an interface based on the clock data recovery (CDR) protocol. The difference between the two is that the clock control is implemented in a different manner.
  • the former uses the clock signal accompanying the clock signal of the transmitted data for clock control, and the latter uses the clock signal for recovering the transmitted data from the transmitted data for clock control.
  • the communication devices inside the communication node M correspond to respective clock sources
  • the communication devices inside the communication node N correspond to respective clock sources.
  • the communication node M transmits data to the communication node N the data transmission between the communication devices inside the communication node M adopts an interface based on the SS protocol
  • Embodiments of the present invention provide a clock signal transmission method and a communication network system in a communication network system for improving transmission reliability.
  • Embodiments of the present invention provide a clock signal transmission method in a communication network system, where the The network system includes a first communication node and a second communication node, the first communication node includes a first communication device and a second communication device, and the second communication node includes a third communication device and a fourth communication device, The second communication device is in communication with the third communication device, and the first communication device is connected to a clock source, where the method includes:
  • the second communication device obtains a transmission clock signal of the second communication device according to the received clock signal of the second communication device;
  • An embodiment of the present invention provides a clock signal transmission method in another communication network system, where the communication network system includes a first communication node and a second communication node, where the first communication node includes a first communication device and a second communication.
  • the second communication node includes a third communication device and a fourth communication device, the second communication device is in communication with the third communication device, and the first communication device is connected to a clock source, wherein the method Includes:
  • the third communication device recovers a transmission clock signal of the second communication device from the data of the transmission clock signal carrying the second communication device sent by the second communication device, as the third communication device a receiving clock signal, the sending clock signal of the second communications device is obtained by the second communications device according to the receiving clock signal of the second communications device, and the receiving clock signal of the second communications device is the a first associated clock signal sent by a communication device, said The associated clock signal is obtained by the first communication device according to the clock signal of the clock source; the third communication device obtains the sending of the third communication device according to the received clock signal of the third communication device Clock signal
  • the embodiment of the present invention further provides a communication network system, where the communication network system includes a first communication node and a second communication node, where the first communication node includes a first communication device and a second communication device, and the second The communication node includes a third communication device and a fourth communication device, the second communication device is in communication with the third communication device, and the first communication device is connected to a clock source, wherein the first communication device is configured to a clock signal of the clock source, obtaining a first associated clock signal, and transmitting the first associated clock signal to the second communication device;
  • the second communication device is configured to receive the first associated clock signal sent by the first communications device, as a receiving clock signal of the second communications device, and according to a receiving clock of the second communications device a signal, obtaining a transmission clock signal of the second communication device, and transmitting, to the third communication device, data carrying a transmission clock signal of the second communication device;
  • the third communication device is configured to receive the data sent by the second communications device, and recover a sending clock signal of the second communications device from the data, as a receiving clock of the third communications device And obtaining a transmission clock signal of the third communication device according to the received clock signal of the third communication device, and obtaining a second associated clock signal according to the transmission clock signal of the third communication device, and
  • the fourth communication device sends the second associated clock signal; the fourth communication device receives the second associated clock signal sent by the third communication device, as a receiving clock of the fourth communication device signal.
  • the embodiments of the present invention can ensure that data transmissions of two communication nodes that communicate with each other refer to the same clock source, thereby avoiding internal communication of the receiving communication node due to different clock sources of the respective communication devices.
  • the problem of the frequency deviation of the communication device can make The transmission rates of the communication devices inside the receiving communication node are matched to avoid the occurrence of packet loss, thereby improving the transmission reliability.
  • FIG. 1 is a schematic flowchart of a clock signal transmission method in a communication network system according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic flowchart of a clock signal transmission method in another communication network system according to Embodiment 2 of the present invention.
  • FIG. 3 is a schematic diagram of an improved communication node M transmitting data to a communication node N according to Embodiment 3 of the present invention
  • FIG. 4 is a schematic structural diagram of a communication network system according to Embodiment 4 of the present invention. detailed description
  • a communication network system may include a first communication node (a sender communication node) and a second communication node (a receiver communication node), where the first communication node includes a first communication device and a second communication device, The second communication node includes a third communication device and a fourth communication device, wherein the second communication device is in communication with the third communication device, and the first communication device is connected Connect to the clock source.
  • FIG. 1 is a schematic flowchart diagram of a clock signal transmission method in a communication network system according to Embodiment 1 of the present invention.
  • the clock signal transmission method in the communication network system of this embodiment may include the following steps:
  • Step 101 The second communication device receives the first associated clock signal sent by the first communications device, as the receiving clock signal of the second communications device, where the first associated clock signal is the first communications device according to the clock source. Obtained by the clock signal;
  • Step 102 The second communications device obtains a transmit clock signal of the second communications device according to the received clock signal of the second communications device.
  • the second communication device may obtain a transmission clock signal of the second communication device by using a Phase-Locked Loop (PLL) according to the received clock signal of the second communication device.
  • PLL Phase-Locked Loop
  • This can be achieved by the second device's own PLL clock chip, or by an external PLL clock chip.
  • Step 103 The second communications device sends, to the third communications device, data that carries the sending clock signal of the second communications device, so that the third communications device recovers the sending clock signal of the second communications device from the data. Taking the receiving clock signal as the third communication device, so that the third communication device obtains the transmission clock signal of the third communication device according to the received clock signal of the third communication device, so that the third communication device The fourth communication device sends the second associated clock signal, and the second associated clock signal is obtained by the third communication device according to the transmission clock signal of the third communication device as the receiving clock signal of the fourth communication device.
  • the foregoing third communication device may obtain the transmission clock signal of the third communication device by using the PLL according to the received clock signal of the third communication device. This can be done either by the third device's own clock chip with PLL or by an external clock chip with PLL.
  • the clock signal transmission method of the embodiment can ensure that the data transmissions of the two communication nodes that communicate with each other refer to the same clock source, thereby avoiding the clock sources of the respective communication devices being different.
  • the problem of the frequency deviation of the communication device inside the receiving communication node can cause the respective transmission rates of the communication devices inside the receiving communication node to match, thereby avoiding the occurrence of packet loss, thereby improving the transmission reliability.
  • FIG. 2 is a schematic flowchart of a clock signal transmission method in another communication network system according to Embodiment 2 of the present invention.
  • the clock signal transmission method in the communication network system of this embodiment may include the following steps:
  • Step 201 The third communications device recovers the sending clock signal of the second communications device from the data of the sending clock signal of the second communications device that is sent by the second communications device, as the receiving clock signal of the third communications device.
  • the sending clock signal of the second communications device is obtained by the second communications device according to the receiving clock signal of the second communications device, and the receiving clock signal of the second communications device is the first associated clock sent by the first communications device.
  • a signal, the first associated clock signal is obtained by the first communications device according to the clock signal of the clock source;
  • the second communication device may obtain a transmission clock signal of the second communication device by using a Phase-Locked Loop (PLL) according to the received clock signal of the second communication device.
  • PLL Phase-Locked Loop
  • This can be achieved by the second device's own PLL clock chip, or by an external PLL clock chip.
  • Step 202 The third communications device obtains a sending clock signal of the third communications device according to the received clock signal of the third communications device.
  • the foregoing third communication device may obtain the transmission clock signal of the third communication device by using the PLL according to the received clock signal of the third communication device. This can be done either by the third device's own clock chip with PLL or by an external clock chip with PLL.
  • Step 203 The third communications device sends a second associated clock signal to the fourth communications device, where the second associated clock signal is obtained by the third communications device according to the sending clock signal of the third communications device.
  • the receiving clock signal of the fourth communication device is obtained by the third communications device according to the sending clock signal of the third communications device.
  • the clock signal transmission method of this embodiment can ensure data of two communication nodes that communicate with each other.
  • the transmissions all refer to the same clock source, thereby avoiding the problem of the frequency deviation of the communication devices inside the receiving communication node due to the different clock sources of the respective communication devices, and enabling the respective transmissions of the communication devices inside the receiving communication node.
  • Rate matching prevents packet loss, which improves transmission reliability.
  • the communication node M includes a communication device A and a communication device B; the communication node N includes a communication device C and a communication device D.
  • the receiving end (RX) of the communication device B uses the associated clock signal MclkAtoB transmitted by the communication device A together with the data MdataAtoB as the operating clock signal of the RX. (Receive clock signal), at the same time, the MclkAtoB output can pass through a clock chip with PLL to obtain the high-precision clock signal MdkBtoC required for high-speed SDS transmission, and then return to communication device B as the transmitting end (TX) of communication device B.
  • Working clock signal sending clock signal.
  • the communication node M uses the MdkBtoC to send the DataMtoN to the communication node N.
  • RX of communication device C uses CDR to recover MdkBtoC (NclkBtoC) from DataMtoN as the working clock signal (receive clock signal), and also can output NclkBtoC output through a clock chip with PLL to obtain high-precision clock signal required for high-speed SDS transmission. NclkCtoD, and then returns to the communication device C as the operation clock signal (transmission clock signal) of the TX of the communication device C.
  • the TX of the communication device C transmits NclkCtoD together with the data NdataCtoD as the associated clock signal to the communication device D.
  • the RX of the communication device D uses the NclkCtoD transmitted from the communication device C together with the data NdataCtoD as the RX operation clock signal (receive clock signal).
  • the communication device A and the communication device B of the communication node M and the communication device C and the communication device D of the communication node N operate under the same clock source ClkAM.
  • the communication network system of this embodiment may include a first communication node 41 and a second communication node 42, and the first communication node 41.
  • the first communication device 41 1 and the second communication device 412 are included.
  • the second communication node 42 includes a third communication device 421 and a fourth communication device 422.
  • the second communication device 412 is communicably connected to the third communication device 421.
  • the first communication device 41 1 is connected to a clock source. among them:
  • the first communication device 411 is configured to obtain a first associated clock signal according to the clock signal of the clock source, and send the first associated clock signal to the second communication device 412;
  • the second communication device 412 is configured to receive the first associated clock signal sent by the first communication device 411 as the receive clock signal of the second communication device 412, and according to the receive clock signal of the second communication device 412. Obtaining a transmission clock signal of the second communication device 412, and transmitting data of the transmission clock signal carrying the second communication device 412 to the third communication device 421;
  • the third communication device 421 is configured to receive the data sent by the second communication device 412, and recover the transmission clock signal of the second communication device 412 from the data, as the receiving clock signal of the third communication device 421. And obtaining a transmission clock signal of the third communication device 421 according to the received clock signal of the third communication device 421, and obtaining a second associated clock signal according to the transmission clock signal of the third communication device 421, and to the fourth The communication device 422 transmits the second associated clock signal;
  • the fourth communication device 422 receives the second associated clock signal sent by the third communication device 421 as the receiving clock signal of the fourth communication device 422.
  • the first communication device in the first embodiment and the second embodiment of the present invention, and the communication device in the third embodiment of the present invention can be implemented by the first communication device 411 in the communication network system provided by the embodiment of the present invention; the second communication device in the first embodiment and the second embodiment of the present invention, and the communication device in the third embodiment of the present invention
  • the functions of the B can be implemented by the second communication device 412 in the communication network system provided by the embodiment of the present invention.
  • the functions of the third communication device in the first and second embodiments of the present invention and the communication device C in the third embodiment of the present invention can be
  • the third communication device 421 is implemented in the communication network system provided by the embodiment of the present invention; the functions of the fourth communication device in the first embodiment and the second embodiment of the present invention, and the communication device D in the third embodiment of the present invention are all provided by the communication provided by the embodiment of the present invention.
  • the fourth communication device 422 is implemented in the network system.
  • the foregoing second communications device 412 in this embodiment may be specifically configured to receive the first associated clock signal sent by the first communications device 411, as the receiving clock signal of the second communications device 412, and according to The receiving clock signal of the second communication device 412 obtains the transmission clock signal of the second communication device 412 by using the PLL, and transmits data of the transmission clock signal carrying the second communication device 412 to the third communication device 421.
  • the third communication device 421 in this embodiment may be specifically configured to receive the data sent by the second communication device 412, and recover a transmission clock signal of the second communication device 412 from the data, as the foregoing.
  • the second associated clock signal transmits the second associated clock signal to the fourth communication device 422.
  • the communication network system of the embodiment can ensure that the data transmissions of the two communication nodes that communicate with each other refer to the same clock source, thereby avoiding the communication device inside the receiver communication node due to the different clock sources of the respective communication devices.
  • the problem of frequency deviation can make the respective transmission rates of the communication devices inside the receiving communication node match, avoiding the occurrence of packet loss, thereby improving the transmission reliability.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例提供通信网络系统中的时钟信号传递方法及通信网络系统,其中的一种方法包括:第二通信设备接收第一通信设备发送的第一随路时钟信号,以作为第二通信设备的接收时钟信号(101);第二通信设备根据第二通信设备的接收时钟信号,获得第二通信设备的发送时钟信号(102);第二通信设备向第三通信设备发送携带第二通信设备的发送时钟信号的数据(103)。本发明实施例能够保证相互通信的两个通信节点的数据传输都参考同一个时钟源,从而解决了由于各个通信设备的时钟源不相同而导致接收方通信节点内部的通信设备的频率偏差的问题,能够使得接收方通信节点内部的通信设备各自的传输速率匹配,避免丢包现象的发生,从而提高了传输可靠性。

Description

通信网络系统中的时钟信号传递方法及通信网络系统
技术领域
本发明实施例涉及通信技术, 尤其涉及通信网络系统中的时钟信号传递 方法及通信网络系统。 背景技术
通信系统中可以包括多个通信节点, 其相互通信的数据可以采用序列化 器 /反序列化器(SerDes, 简称 SDS )进行传输。 SDS有两种类型的接口, 一种为基于源同步( SS )协议的接口,另一种方式为基于时钟数据恢复( CDR ) 协议的接口。 二者的差别在于实现时钟控制的方式不同, 前者是利用伴随传 输数据的时钟信号的随路时钟信号进行时钟控制 , 后者是利用从传输数据中 恢复出传输数据的时钟信号进行时钟控制。
以两个通信节点为例,通信节点 M和通信节点 N ,通信节点 M内部的通 信设备对应各自的时钟源, 类似地, 通信节点 N内部的通信设备对应各自的 时钟源。 当通信节点 M向通信节点 N传输数据时, 通信节点 M内部的通信 设备之间的数据传输采用基于 SS协议的接口,通信节点 M与通信节点 N之 间的数据传输采用基于 CDR协议的接口。 由于各个通信设备的时钟源不相 同, 可能会导致通信节点 N内部的通信设备的频率偏差, 使得通信节点 N内 部的通信设备各自的传输速率不匹配, 导致了丟包现象的发生, 从而降低了 传输可靠性。 发明内容
本发明实施例提供通信网络系统中的时钟信号传递方法及通信网络系 统, 用以提高传输可靠性。
本发明实施例提供了一种通信网络系统中的时钟信号传递方法, 所述通 信网络系统包括第一通信节点和第二通信节点, 所述第一通信节点包括第一 通信设备和第二通信设备, 所述第二通信节点包括第三通信设备和第四通信 设备, 所述第二通信设备与所述第三通信设备通信连接, 所述第一通信设备 连接时钟源, 其中, 所述方法包括:
所述第二通信设备接收所述第一通信设备发送的第一随路时钟信号, 以 作为所述第二通信设备的接收时钟信号, 所述第一随路时钟信号为所述第一 通信设备根据所述时钟源的时钟信号获得的;
所述第二通信设备根据所述第二通信设备的接收时钟信号, 获得所述第 二通信设备的发送时钟信号;
所述第二通信设备向所述第三通信设备发送携带所述第二通信设备的发 送时钟信号的数据, 以使所述第三通信设备从所述数据中恢复出所述第二通 信设备的发送时钟信号, 以作为所述第三通信设备的接收时钟信号, 以使所 述第三通信设备根据所述第三通信设备的接收时钟信号, 获得所述第三通信 设备的发送时钟信号, 以使所述第三通信设备向所述第四通信设备发送第二 随路时钟信号, 所述第二随路时钟信号为所述第三通信设备根据所述第三通 信设备的发送时钟信号获得的, 以作为所述第四通信设备的接收时钟信号。
本发明实施例提供了另一种通信网络系统中的时钟信号传递方法, 所述 通信网络系统包括第一通信节点和第二通信节点, 所述第一通信节点包括第 一通信设备和第二通信设备, 所述第二通信节点包括第三通信设备和第四通 信设备, 所述第二通信设备与所述第三通信设备通信连接, 所述第一通信设 备连接时钟源, 其中, 所述方法包括:
所述第三通信设备从所述第二通信设备发送的携带所述第二通信设备的 发送时钟信号的数据中恢复出所述第二通信设备的发送时钟信号, 以作为所 述第三通信设备的接收时钟信号, 所述第二通信设备的发送时钟信号为所述 第二通信设备根据所述第二通信设备的接收时钟信号获得的, 所述第二通信 设备的接收时钟信号为所述第一通信设备发送的第一随路时钟信号, 所述第 一随路时钟信号为所述第一通信设备根据所述时钟源的时钟信号获得的; 所述第三通信设备根据所述第三通信设备的接收时钟信号, 获得所述第 三通信设备的发送时钟信号;
所述第三通信设备向所述第四通信设备发送第二随路时钟信号, 所述第 二随路时钟信号为所述第三通信设备根据所述第三通信设备的发送时钟信号 获得的, 以作为所述第四通信设备的接收时钟信号。
本发明实施例还提供了一种通信网络系统, 所述通信网络系统包括第一 通信节点和第二通信节点, 所述第一通信节点包括第一通信设备和第二通信 设备, 所述第二通信节点包括第三通信设备和第四通信设备, 所述第二通信 设备与所述第三通信设备通信连接, 所述第一通信设备连接时钟源, 其中, 所述第一通信设备用于根据所述时钟源的时钟信号, 获得第一随路时钟 信号, 并向所述第二通信设备发送所述第一随路时钟信号;
所述第二通信设备用于接收所述第一通信设备发送的所述第一随路时钟 信号, 以作为所述第二通信设备的接收时钟信号, 以及根据所述第二通信设 备的接收时钟信号, 获得所述第二通信设备的发送时钟信号, 并向所述第三 通信设备发送携带所述第二通信设备的发送时钟信号的数据;
所述第三通信设备用于接收所述第二通信设备发送的所述数据, 从所述 数据中恢复出所述第二通信设备的发送时钟信号, 以作为所述第三通信设备 的接收时钟信号, 以及根据所述第三通信设备的接收时钟信号, 获得所述第 三通信设备的发送时钟信号, 并根据所述第三通信设备的发送时钟信号获得 第二随路时钟信号, 并向所述第四通信设备发送所述第二随路时钟信号; 所述第四通信设备接收所述第三通信设备发送的所述第二随路时钟信 号, 以作为所述第四通信设备的接收时钟信号。
由上述技术方案可知, 本发明实施例能够保证相互通信的两个通信节点 的数据传输都参考同一个时钟源, 从而避免了由于各个通信设备的时钟源不 相同而导致的接收方通信节点内部的通信设备的频率偏差的问题, 能够使得 接收方通信节点内部的通信设备各自的传输速率匹配,避免丟包现象的发生, 从而提高了传输可靠性。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作一简单地介绍, 显而易见地, 下 面描述中的附图是本发明的一些实施例, 对于本领域普通技术人员来讲, 在 不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1 为本发明实施例一提供的一种通信网络系统中的时钟信号传递方法 的流程示意图;
图 2为本发明实施例二提供的另一种通信网络系统中的时钟信号传递方 法的流程示意图;
图 3为本发明实施例三提高的通信节点 M向通信节点 N传输数据的示意 图;
图 4为本发明实施例四提供的通信网络系统的结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发 明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整地描述, 显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。 基于 本发明中的实施例, 本领域普通技术人员在没有作出创造性劳动前提下所获 得的所有其他实施例, 都属于本发明保护的范围。
本发明实施例涉及的通信网络系统可以包括第一通信节点 (发送方通信 节点)和第二通信节点 (接收方通信节点) , 上述第一通信节点包括第一通 信设备和第二通信设备, 上述第二通信节点包括第三通信设备和第四通信设 备, 上述第二通信设备与上述第三通信设备通信连接, 上述第一通信设备连 接时钟源。
图 1 为本发明实施例一提供的一种通信网络系统中的时钟信号传递方法 的流程示意图。 本实施例的通信网络系统中的时钟信号传递方法可以包括以 下步骤:
步骤 101、 第二通信设备接收第一通信设备发送的第一随路时钟信号, 以作为上述第二通信设备的接收时钟信号, 上述第一随路时钟信号为上述第 一通信设备根据上述时钟源的时钟信号获得的;
步骤 102、 上述第二通信设备根据上述第二通信设备的接收时钟信号, 获得上述第二通信设备的发送时钟信号;
具体地, 上述第二通信设备具体可以根据上述第二通信设备的接收时钟 信号, 利用锁相环(Phase-Locked Loop, 简称 PLL )获得上述第二通信设 备的发送时钟信号。 具体可以通过第二设备自身的带 PLL的时钟芯片实现, 或者还可以通过外部的带 PLL的时钟芯片实现。
步骤 103、 上述第二通信设备向第三通信设备发送携带上述第二通信设 备的发送时钟信号的数据, 以使上述第三通信设备从上述数据中恢复出上述 第二通信设备的发送时钟信号, 以作为上述第三通信设备的接收时钟信号, 以使上述第三通信设备根据上述第三通信设备的接收时钟信号, 获得上述第 三通信设备的发送时钟信号, 以使上述第三通信设备向第四通信设备发送第 二随路时钟信号, 上述第二随路时钟信号为上述第三通信设备根据上述第三 通信设备的发送时钟信号获得的,以作为上述第四通信设备的接收时钟信号。
具体地, 上述第三通信设备具体可以根据上述第三通信设备的接收时钟 信号, 利用 PLL获得上述第三通信设备的发送时钟信号。 具体可以通过第三 设备自身的带 PLL的时钟芯片实现,或者还可以通过外部的带 PLL的时钟芯 片实现。
本实施例的时钟信号传递方法能够保证相互通信的两个通信节点的数据 传输都参考同一个时钟源, 从而避免了由于各个通信设备的时钟源不相同而 导致的接收方通信节点内部的通信设备的频率偏差的问题, 能够使得接收方 通信节点内部的通信设备各自的传输速率匹配, 避免丟包现象的发生, 从而 提高了传输可靠性。
图 2为本发明实施例二提供的另一种通信网络系统中的时钟信号传递方 法的流程示意图。 本实施例的通信网络系统中的时钟信号传递方法可以包括 以下步骤:
步骤 201、 第三通信设备从第二通信设备发送的携带上述第二通信设备 的发送时钟信号的数据中恢复出上述第二通信设备的发送时钟信号, 以作为 上述第三通信设备的接收时钟信号, 上述第二通信设备的发送时钟信号为上 述第二通信设备根据上述第二通信设备的接收时钟信号获得的, 上述第二通 信设备的接收时钟信号为第一通信设备发送的第一随路时钟信号, 上述第一 随路时钟信号为上述第一通信设备根据上述时钟源的时钟信号获得的;
具体地, 上述第二通信设备具体可以根据上述第二通信设备的接收时钟 信号, 利用锁相环(Phase-Locked Loop, 简称 PLL )获得上述第二通信设 备的发送时钟信号。 具体可以通过第二设备自身的带 PLL的时钟芯片实现, 或者还可以通过外部的带 PLL的时钟芯片实现。
步骤 202、 上述第三通信设备根据上述第三通信设备的接收时钟信号, 获得上述第三通信设备的发送时钟信号;
具体地, 上述第三通信设备具体可以根据上述第三通信设备的接收时钟 信号, 利用 PLL获得上述第三通信设备的发送时钟信号。 具体可以通过第三 设备自身的带 PLL的时钟芯片实现,或者还可以通过外部的带 PLL的时钟芯 片实现。
步骤 203、 上述第三通信设备向第四通信设备发送第二随路时钟信号, 上述第二随路时钟信号为上述第三通信设备根据上述第三通信设备的发送时 钟信号获得的, 以作为上述第四通信设备的接收时钟信号。
本实施例的时钟信号传递方法能够保证相互通信的两个通信节点的数据 传输都参考同一个时钟源, 从而避免了由于各个通信设备的时钟源不相同而 导致的接收方通信节点内部的通信设备的频率偏差的问题, 能够使得接收方 通信节点内部的通信设备各自的传输速率匹配, 避免丟包现象的发生, 从而 提高了传输可靠性。
为使得本发明实施例提供的方法更加清楚, 下面将以通信节点 M向通信 节点 N传输数据作为举例。通信节点 M包括通信设备 A和通信设备 B; 通信 节点 N包括通信设备 C和通信设备 D。
如图 3所示, 在通信节点 M向通信节点 N的传输方向上, 通信设备 B 的接收端 ( RX )将通信设备 A与数据 MdataAtoB一起传来的随路时钟信号 MclkAtoB作为 RX的工作时钟信号(接收时钟信号),同时还可以将 MclkAtoB 输出经过一个带 PLL的时钟芯片 , 获得高速 SDS传输要求的高精度时钟信 号 MdkBtoC, 再返回给通信设备 B, 作为通信设备 B的发送端 (TX ) 的工 作时钟信号 (发送时钟信号)。 这样, 通信节点 M 则利用 MdkBtoC发送 DataMtoN给通信节点 N。
通信设备 C 的 RX 利用 CDR 从 DataMtoN 中恢复出 MdkBtoC ( NclkBtoC )作为工作时钟信号 (接收时钟信号), 同时还可以将 NclkBtoC 输出经过一个带 PLL的时钟芯片 , 获得高速 SDS传输要求的高精度时钟信 号 NclkCtoD, 再返回给通信设备 C, 作为通信设备 C的 TX的工作时钟信号 (发送时钟信号)。通信设备 C的 TX将 NclkCtoD与数据 NdataCtoD一起作 为随路时钟信号发送给通信设备 D。 通信设备 D的 RX将通信设备 C与数据 NdataCtoD一起传来的 NclkCtoD作为 RX的工作时钟信号(接收时钟信号)。
至此, 通信节点 M的通信设备 A和通信设备 B与通信节点 N的通信设 备 C和通信设备 D在同一个时钟源 ClkAM下工作。
需要说明的是: 对于前述的各方法实施例, 为了简单描述, 故将其都表 述为一系列的动作组合, 但是本领域技术人员应该知悉, 本发明并不受所描 述的动作顺序的限制, 因为依据本发明, 某些步骤可以采用其他顺序或者同 时进行。 其次, 本领域技术人员也应该知悉, 说明书中所描述的实施例均属 于优选实施例, 所涉及的动作和模块并不一定是本发明所必须的。
在上述实施例中, 对各个实施例的描述都各有侧重, 某个实施例中没有 详述的部分, 可以参见其他实施例的相关描述。
图 4为本发明实施例四提供的通信网络系统的结构示意图,如图 4所示, 本实施例的通信网络系统可以包括第一通信节点 41和第二通信节点 42, 上 述第一通信节点 41包括第一通信设备 41 1和第二通信设备 412,上述第二通 信节点 42包括第三通信设备 421和第四通信设备 422, 上述第二通信设备 412与上述第三通信设备 421通信连接,上述第一通信设备 41 1连接时钟源。 其中:
上述第一通信设备 411用于根据上述时钟源的时钟信号, 获得第一随路 时钟信号, 并向上述第二通信设备 412发送上述第一随路时钟信号;
上述第二通信设备 412用于接收上述第一通信设备 411发送的上述第一 随路时钟信号, 以作为上述第二通信设备 412的接收时钟信号, 以及根据上 述第二通信设备 412的接收时钟信号, 获得上述第二通信设备 412的发送时 钟信号, 并向上述第三通信设备 421发送携带上述第二通信设备 412的发送 时钟信号的数据;
上述第三通信设备 421 用于接收上述第二通信设备 412发送的上述数 据, 从上述数据中恢复出上述第二通信设备 412的发送时钟信号, 以作为上 述第三通信设备 421的接收时钟信号, 以及根据上述第三通信设备 421的接 收时钟信号, 获得上述第三通信设备 421的发送时钟信号, 并根据上述第三 通信设备 421的发送时钟信号获得第二随路时钟信号, 并向上述第四通信设 备 422发送上述第二随路时钟信号;
上述第四通信设备 422接收上述第三通信设备 421发送的上述第二随路 时钟信号, 以作为上述第四通信设备 422的接收时钟信号。
上述本发明实施例一和二中第一通信设备、 本发明实施例三中通信设备 A的功能均可以由本发明实施例提供的通信网络系统中第一通信设备 411 实 现; 上述本发明实施例一和二中第二通信设备、 本发明实施例三中通信设备
B的功能均可以由本发明实施例提供的通信网络系统中第二通信设备 412实 现; 上述本发明实施例一和二中第三通信设备、 本发明实施例三中通信设备 C的功能均可以由本发明实施例提供的通信网络系统中第三通信设备 421 实 现; 上述本发明实施例一和二中第四通信设备、 本发明实施例三中通信设备 D的功能均可以由本发明实施例提供的通信网络系统中第四通信设备 422实 现。
具体地, 本实施例中的上述第二通信设备 412具体可以用于接收上述第 一通信设备 411 发送的上述第一随路时钟信号, 以作为上述第二通信设备 412的接收时钟信号, 以及根据上述第二通信设备 412的接收时钟信号, 利 用 PLL获得上述第二通信设备 412的发送时钟信号,并向上述第三通信设备 421发送携带上述第二通信设备 412的发送时钟信号的数据。
具体地, 本实施例中的上述第三通信设备 421具体可以用于接收上述第 二通信设备 412 发送的上述数据, 从上述数据中恢复出上述第二通信设备 412的发送时钟信号, 以作为上述第三通信设备 421的接收时钟信号, 以及 根据上述第三通信设备 421的接收时钟信号,利用 PLL获得上述第三通信设 备 421的发送时钟信号, 并根据上述第三通信设备 421的发送时钟信号获得 第二随路时钟信号,并向上述第四通信设备 422发送上述第二随路时钟信号。
本实施例的通信网络系统能够保证相互通信的两个通信节点的数据传输 都参考同一个时钟源, 从而避免了由于各个通信设备的时钟源不相同而导致 的接收方通信节点内部的通信设备的频率偏差的问题, 能够使得接收方通信 节点内部的通信设备各自的传输速率匹配, 避免丟包现象的发生, 从而提高 了传输可靠性。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机可读 取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述 的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对其 限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通技术 人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修改, 或 者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要求
1、一种通信网络系统中的时钟信号传递方法, 所述通信网络系统包括第 一通信节点和第二通信节点, 所述第一通信节点包括第一通信设备和第二通 信设备, 所述第二通信节点包括第三通信设备和第四通信设备, 所述第二通 信设备与所述第三通信设备通信连接, 所述第一通信设备连接时钟源, 其特 征在于, 所述方法包括:
所述第二通信设备接收所述第一通信设备发送的第一随路时钟信号, 以 作为所述第二通信设备的接收时钟信号, 所述第一随路时钟信号为所述第一 通信设备根据所述时钟源的时钟信号获得的;
所述第二通信设备根据所述第二通信设备的接收时钟信号, 获得所述第 二通信设备的发送时钟信号;
所述第二通信设备向所述第三通信设备发送携带所述第二通信设备的发 送时钟信号的数据, 以使所述第三通信设备从所述数据中恢复出所述第二通 信设备的发送时钟信号, 以作为所述第三通信设备的接收时钟信号, 以使所 述第三通信设备根据所述第三通信设备的接收时钟信号, 获得所述第三通信 设备的发送时钟信号, 以使所述第三通信设备向所述第四通信设备发送第二 随路时钟信号, 所述第二随路时钟信号为所述第三通信设备根据所述第三通 信设备的发送时钟信号获得的, 以作为所述第四通信设备的接收时钟信号。
2、 根据权利要求 1所述的方法, 其特征在于, 所述第二通信设备根据所 述第二通信设备的接收时钟信号, 获得所述第二通信设备的发送时钟信号, 包括:
所述第二通信设备根据所述第二通信设备的接收时钟信号, 利用 PLL获 得所述第二通信设备的发送时钟信号。
3、一种通信网络系统中的时钟信号传递方法, 所述通信网络系统包括第 一通信节点和第二通信节点, 所述第一通信节点包括第一通信设备和第二通 信设备, 所述第二通信节点包括第三通信设备和第四通信设备, 所述第二通 信设备与所述第三通信设备通信连接, 所述第一通信设备连接时钟源, 其特 征在于, 所述方法包括:
所述第三通信设备从所述第二通信设备发送的携带所述第二通信设备的 发送时钟信号的数据中恢复出所述第二通信设备的发送时钟信号, 以作为所 述第三通信设备的接收时钟信号, 所述第二通信设备的发送时钟信号为所述 第二通信设备根据所述第二通信设备的接收时钟信号获得的, 所述第二通信 设备的接收时钟信号为所述第一通信设备发送的第一随路时钟信号, 所述第 一随路时钟信号为所述第一通信设备根据所述时钟源的时钟信号获得的; 所述第三通信设备根据所述第三通信设备的接收时钟信号, 获得所述第 三通信设备的发送时钟信号;
所述第三通信设备向所述第四通信设备发送第二随路时钟信号, 所述第 二随路时钟信号为所述第三通信设备根据所述第三通信设备的发送时钟信号 获得的, 以作为所述第四通信设备的接收时钟信号。
4、 根据权利要求 3所述的方法, 其特征在于, 所述第三通信设备根据所 述第三通信设备的接收时钟信号, 获得所述第三通信设备的发送时钟信号, 包括:
所述第三通信设备根据所述第三通信设备的接收时钟信号, 利用 PLL获 得所述第三通信设备的发送时钟信号。
5、 一种通信网络系统, 其特征在于, 所述通信网络系统包括第一通信节 点和第二通信节点, 所述第一通信节点包括第一通信设备和第二通信设备, 所述第二通信节点包括第三通信设备和第四通信设备, 所述第二通信设备与 所述第三通信设备通信连接, 所述第一通信设备连接时钟源, 其中,
所述第一通信设备用于根据所述时钟源的时钟信号, 获得第一随路时钟 信号, 并向所述第二通信设备发送所述第一随路时钟信号;
所述第二通信设备用于接收所述第一通信设备发送的所述第一随路时钟 信号, 以作为所述第二通信设备的接收时钟信号, 以及根据所述第二通信设 备的接收时钟信号, 获得所述第二通信设备的发送时钟信号, 并向所述第三 通信设备发送携带所述第二通信设备的发送时钟信号的数据;
所述第三通信设备用于接收所述第二通信设备发送的所述数据, 从所述 数据中恢复出所述第二通信设备的发送时钟信号, 以作为所述第三通信设备 的接收时钟信号, 以及根据所述第三通信设备的接收时钟信号, 获得所述第 三通信设备的发送时钟信号, 并根据所述第三通信设备的发送时钟信号获得 第二随路时钟信号, 并向所述第四通信设备发送所述第二随路时钟信号; 所述第四通信设备接收所述第三通信设备发送的所述第二随路时钟信 号, 以作为所述第四通信设备的接收时钟信号。
6、 根据权利要求 5所述的系统, 其特征在于, 所述第二通信设备具体用 于接收所述第一通信设备发送的所述第一随路时钟信号, 以作为所述第二通 信设备的接收时钟信号, 以及根据所述第二通信设备的接收时钟信号, 利用 PLL获得所述第二通信设备的发送时钟信号, 并向所述第三通信设备发送携 带所述第二通信设备的发送时钟信号的数据。
7、根据权利要求 5或 6所述的系统, 其特征在于, 所述第三通信设备具 体用于接收所述第二通信设备发送的所述数据 , 从所述数据中恢复出所述第 二通信设备的发送时钟信号, 以作为所述第三通信设备的接收时钟信号, 以 及根据所述第三通信设备的接收时钟信号, 利用 PLL获得所述第三通信设备 的发送时钟信号, 并根据所述第三通信设备的发送时钟信号获得第二随路时 钟信号, 并向所述第四通信设备发送所述第二随路时钟信号。
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