>> According to 802.1 AS all message timestamps shall be based on a free >> running clock (LocalClock) in order to minimize the errors resulting from a >> varying clock frequency. >> Also phase discontinuities in the pdelay_resp(fup) messages are avoided this >> way. >> So the SlaveClock controlled by the servo is different from the hardware >> clock taking the timestamps. >> An implementation would require to translate hardware timestamps into the >> SlaveClock epoch to compute the master offset correctly. >> >> I was not able to find this behavior implemented in linuxptp. Did I miss >> something, or was this already issued?
>You are mistaken. The master offset is irrelevant for TC operation. >The TC is supposed to syntonize only. You are right, a plain TC does not need the offset. My use case is a bridged end-station, i.e. a time-aware bridge with an application that needs to be synchronized. The AS model of operation allows every time-aware system (including TAB) to include a ClockSlave and provide an application interface to a ClockTarget. Syntonization is done by multiplying the residence time with the rate ratio, no servo needed, right? So the servo should be free for synchronizing the ClockSlave but this requires the offset. Would this be possible with linuxptp? Any advice is appreciated. Regards, Burkhard Hilscher Gesellschaft für Systemautomation mbH | Rheinstrasse 15 | 65795 Hattersheim | Germany | www.hilscher.com Sitz der Gesellschaft / place of business: Hattersheim | Geschäftsführer / managing director: Dipl.-Ing. Hans-Jürgen Hilscher Handelsregister / commercial register: Frankfurt B 26873 | Ust. Idnr. / VAT No.: DE113852715 Registergericht / register court: Amtsgericht Frankfurt/Main Important Information: This e-mail message including its attachments contains confidential and legally protected information solely intended for the addressee. If you are not the intended addressee of this message, please contact the addresser immediately and delete this message including its attachments. The unauthorized dissemination, copying and change of this e-mail are strictly forbidden. The addresser shall not be liable for the content of such changed e-mails. Wichtiger Hinweis: Diese E-Mail einschließlich ihrer Anhänge enthält vertrauliche und rechtlich geschützte Informationen, die nur für den Adressaten bestimmt sind. Sollten Sie nicht der bezeichnete Adressat sein, so teilen Sie dies bitte dem Absender umgehend mit und löschen Sie diese Nachricht und ihre Anhänge. Die unbefugte Weitergabe, das Anfertigen von Kopien und jede Veränderung der E-Mail ist untersagt. Der Absender haftet nicht für Inhalte von veränderten E-Mails.
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