希望知道的給解答以下
6.5.5 Peer-to-peer transparent clocks
The peer-to-peer transparent clock has an additional per port block as indicated in Figure 7. This block is
used to compute the link delay between each port and a similarly equipped port on another node sharing the
link, i.e., the link peer. The link peer exists in another clock supporting the peer delay mechanism since
non-peer-to-peer devices are not expected between peer-to-peer transparent clocks. The computation of link
delay is based on an exchange of Pdelay_Req, Pdelay_Resp, and possibly Pdelay_Resp_Follow_Up
messages with the link peer. As a result of these exchanges, the link delay is known for each port of the
peer-to-peer transparent clock. Unlike the end-to-end transparent clock, which corrects and forwards all
PTP timing messages, the peer-to-peer transparent clock only corrects and forwards Sync and Follow_Up
messages. The appropriate correctionField in these messages is updated for both the residence time of the
Sync message within the peer-to-peer transparent clock and the link delay on the port receiving the Sync
message.
就是這一節，這個時間模塊意思P2P和E2ETC都有，只是處理訊息的方法不同。但是P2P遇到Follow—up訊息會直接丟掉，又怎么會修正。另一個As a result of these exchanges, the link delay is known for each port of the peer-to-peer transparent clock. P2P知道鏈路延遲，E2ETC也同樣知道啊，所以不理解為什么能從這兩個方面來說明P2P比E2E的時間同步精度高
uj5u.com熱心網友回復：
我也剛看1588協議。理論上，主時鐘是需要發送包含有真實的sync幀發送時間的follow_up幀的，實際上，很多產品都是硬體上實作時間戳功能的，時間戳可以記錄sync的實際發送時刻，故就不需要follow_up了。end-to-end的透明時鐘是修正和轉發所有的PTP時間資訊， peer-to-peer的透明時鐘只修正和轉發轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/119486.html
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