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Q配套的硬件 是一个独立的带网络接口的硬件 还是说是一个芯片？
A If you are talking about our 1588 Clock Module products, then the modules include 1G Ethernet ports, RGMII interfaces. You can use these modules in an in-line fashion or as an 1588 PTP offload to the main CPU/Switch. If you are talking about a more scalable customer design, then the AccuTime Software (i.e. PTP Control Loop) software would be run on the main CPU/Switch while the PLL IC would be sitting next to CPU/Switch.
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Q这个高精度时间同步目前有实际在使用的应用例子吗？
A Yes, the most recent relevent applications are 5G equipment like RU or DU. In the presentaion, I also mentioned about power grid communication, viedo broadcast applications.
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Q时间同步如何补偿延时到达的数据？
A There is an algorithm (servo) to achieve time sync..tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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Q千兆以太网IEEE 1588协议的实现方法可提供哪些设计参考？
A We have 1588 Clock Modules which can support 1G Ethernet and it's a plug-and-play solution (i.e. with our AccuTime softwre running on the MCU on the clcok module and PLL IC and on the module as well).
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Q请问维护起来困难不，是可以自动追踪的么
A Yes, it's an automated process..tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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QSilicon Labs 是提供网络产品吗?
ASilicon Labs提供一系列的IEEE 1588 和同步以太网时钟解决方案，包括模块和软件工具，您可以访问产品官网查阅相关信息和文档：https://cn.silabs.com/timing/network-synchronizers
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QIEEE1588已经用客户在用了吗？
A Yes
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QSilicon Labs的IEEE 1588模块，功耗怎么样？
A您可以访问Silicon Labs的IEEE 1588模块产品官网查阅相关信息和文档：https://cn.silabs.com/timing/network-synchronizers
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Q其时延最少是多少？
AITU-T G.8273.2 defines four classes of T-BC (Telecom Boundary Clock, the nodes in the transmission path), Class A to D, with different time accuracy requirements, Class A is the easiest to meet and Class D is the hardest. Currently, most of 5G equipment are trying to meet Class C, max 5 hops, each hops Max Time Error= 30ns. Silabs can achieve Class C today and we are working on Class D now.
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Q节点与节点之间的数据包是多少？
AThe "bandwidth" required to carry PTP packets are actually not that high. First, the PTP Control Loop (i.e. Servo SW) should be performing some filtering of the timestamps and therefore only updating every ‘n’ timestamps (where ‘n’ will vary based on the PDV noise, etc.) . Let’s even assume the Servo makes adjustments for every timestamp. We would be looking at 60 – 80 bits x 128 PTP packets/sec.
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QIEEE 1588达成高精度的时间同步对于自动驾驶应该，是否符合功能安全？
A It's defined by the standard..tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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Q网络时钟精确度是多少？纳秒级？
A ns等級
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Q目前支持IEEE 1588有哪些芯片？
ASilicon Labs提供一系列的IEEE 1588 和同步以太网定时解决方案，包括模块和软件工具，您可以访问产品官网查阅相关信息和文档：https://cn.silabs.com/timing/network-synchronizers
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Q时间同步的精度有无极限？目前已能达到何等高水平？
A Right now it's ns level accuracy.tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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Q在RFC1588的发展过程中，有几个版本？分别对应解决了哪一些需求？
A IEEE 1588 is designed to fill a niche not well served by either NTP (which is a few ms of Coordinated Universal Time (UTC)) and GPS. IEEE 1588 is designed for local systems requiring accuracies beyond those attainable using NTP. It is also designed for applications that cannot bear the cost of a GPS receiver at each node, or for which GPS signals are inaccessible..tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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QRFC时间同步主要的意义在于设备之间的同步还是和实时钟同步？
A Both.tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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Q磁场、金属会对时间同步有影响吗？
A It will impact whether GNSS can be received reliably.tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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Q高精度同步时间，对网络数据传输速度会不会产生影响？
A No but the traffic loading will impact accuracy.tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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Q网络时钟与格林威治时间是否完全同步？
A Not 100%.tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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Q四大卫星系统之间的时间或者说频率是否同步？
A Yes.tb_button {padding:1px;cursor:pointer;border-right: 1px solid #8b8b8b;border-left: 1px solid #FFF;border-bottom: 1px solid #fff;}.tb_button.hover {borer:2px outset #def; background-color: #f8f8f8 !important;}.ws_toolbar {z-index:100000} .ws_toolbar .ws_tb_btn {cursor:pointer;border:1px solid #555;padding:3px} .tb_highlight{background-color:yellow} .tb_hide {visibility:hidden} .ws_toolbar img {padding:2px;margin:0px}
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