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QIEEE1588协议是将将每天时间信息从主控时钟发送到客户时钟吗？
A Yes, but it's more frequent than once a day..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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QIP网络中需要时钟同步吗？如何实现？
A Networks should ultimately synchronize a master clock source which will normally be a GPS. The issue is, GPS is not reliably available everywhere so we need to use PTP as a mean to transmit time/clock..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时间同步协议RFC1588的时间稳定的依赖的核心时间数据是什么？对于不在一个地方（比如地球两侧，距离几千上万公里）的设备的同步也可以可靠控制吗？
A Networks should ultimately synchronize a master clock source which will normally be a GPS. The issue is, GPS is not reliably available everywhere so we need to use PTP as a mean to transmit time/clock..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全世界的运营商的骨干网络都能可靠的支持RFC1588协议吗？
A That is the trend..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多久会检测时间然后修正，修正的时间来自哪里
A Networks should ultimately synchronize a master clock source which will normally be a GPS. The issue is, GPS is not reliably available everywhere so we need to use PTP as a mean to transmit time/clock..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支持RFC1588协议的网络，对于两端的设备有哪一些要求？对于中间的传送传输设备有什么要求？
A Obviously, the source and sink nodes need support 1588 PTP and the transport node need to be as transparent as possible (like a wire). Path symmetry is also important. If there is a switch or router in the middle, then the switch/router node is preferred to be PTP aware, meaning supporting Boundary Clock or Transparent Clock ..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支持RFC1588的设备都一定要配备GPS模块吗？北斗或格纳斯的行不行？
A GPS is not a must. Yes, all GPS satellites are possible..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传输网的哪一些设备可能阻挡RFC1588协议数据包，从而使得RFC1588同步失败？
A Switch, Router or any OTN systems with intrusive mapping/demapping of Ethernet to OTN (such as GFP).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无人驾驶需要的时间同步要求是什么级别（ns还是ms？或者更低?），如果没有同步好的话会引起什么后果？
A Time synchronization is particularly important when V2V (i.e. vehicle to vehicle) and V2X (i.e. vehicle to everything) start to roll out in our life. Car to car communication, Car to traffic sign communication and car to cloud communication will all be enablers for high level of automatous driving and time synchronization will not only impact feasibility, user experience but also human life or death. Wrt time accuracy requirement for automatous driving apps, please refer to the appropriate standards.
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Q时间同步错误会对无人驾驶产生什么影响？
ATime synchronization is particularly important when V2V (i.e. vehicle to vehicle) and V2X (i.e. vehicle to everything) start to roll out in our life. Car to car communication, Car to traffic sign communication and car to cloud communication will all be enablers for high level of automatous driving and time synchronization will not only impact feasibility, user experiece but also human life or death.
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Q高精度的时间同步都需要借助卫星吗，用的什么卫星？
A From optical communications such as PDH/SDH/SONET/OTN, to Ethernet networking with higher SLA, to today's 5G equipment like RU or DU, you would see 1PPS from Satellite, PTP, SyncE and local reference clock as close sources and there would be switching mechanism between them. Wrt switching, there would be holdover feature as well. Silabs’ solution supports hitless switching as well as holdover.
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Q临近设备之间的时间同步协议RFC1588之类，还需要经过核心网传送吗？那样要经过的节点不是太多了吗？能不能横向经过最少的设备节点呢？
AYes, the goal here is to use the data plane (i.e. the link that is used to transmit data) to also transmit "time" information and to try to achieve time synchonization. Therefore, the number of nodes/hops and whether the nodes/hops in the middle is PTP aware or not will impact tiem accuracy. ITU-T G.8273.2 defines four classes of T-BC (Teleocm Boundry Clock, the nodes in the transmission path), Class A to D, with different time accuracy requriements, Class A is the easies to meet and Class D is the hardest. Currently, most of 5G equipments are trying to meet Class C, max 5 hops, each hops Max Time Error= 30ns.
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Q支持RFC1588的协议的设备是否需要配置实时时钟（带电池的）？Silicon Labs有对应的 时钟产品吗？
ASilabs' 1588 timing soltuions will be shown at the end of this presentation.
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QSi5388/89解决方案中包含了哪些IEEE 1588配置文件Profiles？谢谢
A G.8275.1 (Telecom profile for phase with full timing support networks), G.8275.2 (Telecom profile for phase with partial timing support networks) and G.8265.1 (Telecom profile for frequency synchronization).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工业以太网或运动设备的数据包传送因为干扰或重连或者冲突检测，延时甚至掉包是很不稳定的，RFC1588对于这样的环境如何控制同步？
A PTP protocol is a repeating hand-shaking process so if there is a traffic disruption, the protocol will try to resend PTP massages again or protection switching will kick in..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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Qns级别的时间同步整个过程需要多久才能完成？
A PTP protocol is a repeating hand-shaking process so time to achieve synchronization will depend on traffic loading, number of hops and etc..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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QSi5388/89是否支持T-TC和T-GM配置？谢谢
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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Q既然Si5388/89支持1pps模式，那么我们可以把它用于APTS吗？谢谢
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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Q软件有中文版本吗？
A No..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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QSi5388/89的1pps输入时钟的锁定时间大概是多少？我们可以测量出来吗？谢谢
A It takes about 2 mins to fully lock but 25 sec to lock within <10ns phase error..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}