[e2e] Clock Synchronization Protocols/Algorithms
Bill Manning
bmanning at ISI.EDU
Wed Oct 31 13:09:28 PST 2001
I've seen some clocks that are w/in 20usec. Really, NTP is your friend.
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% Hi Bill
%
% I would like the jitter to b within 200 usec.
%
% How precise NTP can be ?
%
% Hesham
%
% -----Original Message-----
% From: Bill Manning [mailto:bmanning at ISI.EDU]
% Sent: Wednesday, October 31, 2001 12:43 PM
% To: Elbakoury, Hesham [SC5:323:EXCH]
% Cc: braden at ISI.EDU; end2end-interest at postel.org
% Subject: Re: [e2e] Clock Synchronization Protocols/Algorithms
%
%
%
% How accurate do you need? NTP can be very precise.
%
%
% %
% % This message is in MIME format. Since your mail reader does not understand
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% %
% % Hi Bob
% %
% % I know about NTP. I am looking for other protocols that can provide more
% % accurate clock synchronization.
% %
% % Thanks
% %
% % Hesham
% %
% % -----Original Message-----
% % From: Bob Braden [mailto:braden at ISI.EDU]
% % Sent: Wednesday, October 31, 2001 12:00 PM
% % To: end2end-interest at postel.org; Elbakoury, Hesham [SC5:323:EXCH]
% % Subject: Re: [e2e] Clock Synchronization Protocols/Algorithms
% %
% %
% %
% % *> From end2end-interest-admin at postel.org Wed Oct 31 11:55:34 2001
% % *> From: "Hesham Elbakoury" <helbakou at nortelnetworks.com>
% % *> To: end2end-interest at postel.org
% % *> Importance: high
% % *> X-Priority: 1
% % *> MIME-Version: 1.0
% % *> X-Orig: <helbakou at americasm06.nt.com>
% % *> Subject: [e2e] Clock Synchronization Protocols/Algorithms
% % *> X-BeenThere: end2end-interest at postel.org
% % *> X-Mailman-Version: 2.0.1
% % *> List-Help: <mailto:end2end-interest-request at postel.org?subject=help>
% % *> List-Archive: <http://www.postel.org/pipermail/end2end-interest/>
% % *> Date: Wed, 31 Oct 2001 11:51:01 -0800
% % *>
% % *>
% % *> I am interested to find out what are the protocols (e.g. NTP) that
% % are
% % *> developed for clock synchronization and their methods
% % *> to reduce/eliminate the effect of jitter in the distribution of
% % *> clock/timestamp informations. This jitter is due to queuing delays
% and
% % *> S/W packet processing overhead.
% % *>
% % *> Thanks
% % *>
% % *> Hesham
% %
% % Go to the RFC Editor Web page www.rfc-editor.org and search for "NTP".
% %
% % Bob Braden
% %
% % ------_=_NextPart_001_01C1624C.0D60AA80
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% % <TITLE>RE: [e2e] Clock Synchronization Protocols/Algorithms</TITLE>
% % </HEAD>
% % <BODY>
% %
% % <P><FONT SIZE=3D2>Hi Bob</FONT>
% % </P>
% %
% % <P><FONT SIZE=3D2> I know about NTP. I am looking for other =
% % protocols that can provide more accurate clock synchronization.</FONT>
% % </P>
% %
% % <P><FONT SIZE=3D2> Thanks</FONT>
% % </P>
% %
% % <P><FONT SIZE=3D2> Hesham</FONT>
% % </P>
% %
% % <P><FONT SIZE=3D2>-----Original Message-----</FONT>
% % <BR><FONT SIZE=3D2>From: Bob Braden [<A =
% % HREF=3D"mailto:braden at ISI.EDU">mailto:braden at ISI.EDU</A>]</FONT>
% % <BR><FONT SIZE=3D2>Sent: Wednesday, October 31, 2001 12:00 PM</FONT>
% % <BR><FONT SIZE=3D2>To: end2end-interest at postel.org; Elbakoury, Hesham =
% % [SC5:323:EXCH]</FONT>
% % <BR><FONT SIZE=3D2>Subject: Re: [e2e] Clock Synchronization =
% % Protocols/Algorithms</FONT>
% % </P>
% % <BR>
% % <BR>
% %
% % <P><FONT SIZE=3D2> *> From =
% % end2end-interest-admin at postel.org Wed Oct 31 11:55:34 2001</FONT>
% % <BR><FONT SIZE=3D2> *> From: "Hesham Elbakoury" =
% % <helbakou at nortelnetworks.com></FONT>
% % <BR><FONT SIZE=3D2> *> To: end2end-interest at postel.org</FONT>
% % <BR><FONT SIZE=3D2> *> Importance: high</FONT>
% % <BR><FONT SIZE=3D2> *> X-Priority: 1</FONT>
% % <BR><FONT SIZE=3D2> *> MIME-Version: 1.0</FONT>
% % <BR><FONT SIZE=3D2> *> X-Orig: =
% % <helbakou at americasm06.nt.com></FONT>
% % <BR><FONT SIZE=3D2> *> Subject: [e2e] Clock Synchronization =
% % Protocols/Algorithms</FONT>
% % <BR><FONT SIZE=3D2> *> X-BeenThere: =
% % end2end-interest at postel.org</FONT>
% % <BR><FONT SIZE=3D2> *> X-Mailman-Version: 2.0.1</FONT>
% % <BR><FONT SIZE=3D2> *> List-Help: <<A =
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% % <BR><FONT SIZE=3D2> *> List-Archive: <<A =
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% % gt;</FONT>
% % <BR><FONT SIZE=3D2> *> Date: Wed, 31 Oct 2001 11:51:01 =
% % -0800</FONT>
% % <BR><FONT SIZE=3D2> *> </FONT>
% % <BR><FONT SIZE=3D2> *> </FONT>
% % <BR><FONT SIZE=3D2> *> I am interested to =
% % find out what are the protocols (e.g. NTP) that are</FONT>
% % <BR><FONT SIZE=3D2> *> developed for clock synchronization and =
% % their methods </FONT>
% % <BR><FONT SIZE=3D2> *> to reduce/eliminate =
% % the effect of jitter in the distribution of</FONT>
% % <BR><FONT SIZE=3D2> *> clock/timestamp informations. This =
% % jitter is due to queuing delays and</FONT>
% % <BR><FONT SIZE=3D2> *> S/W packet processing =
% % overhead.</FONT>
% % <BR><FONT SIZE=3D2> *> </FONT>
% % <BR><FONT SIZE=3D2> *> Thanks</FONT>
% % <BR><FONT SIZE=3D2> *> </FONT>
% % <BR><FONT SIZE=3D2> *> Hesham</FONT>
% % </P>
% %
% % <P><FONT SIZE=3D2>Go to the RFC Editor Web page www.rfc-editor.org and =
% % search for "NTP".</FONT>
% % </P>
% %
% % <P><FONT SIZE=3D2>Bob Braden</FONT>
% % </P>
% %
% % </BODY>
% % </HTML>
% % ------_=_NextPart_001_01C1624C.0D60AA80--
% %
%
%
% --
% --bill
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% <BODY>
%
% <P><FONT SIZE=3D2>Hi Bill</FONT>
% </P>
%
% <P><FONT SIZE=3D2> I would like the jitter to b within 200 =
% usec.</FONT>
% </P>
%
% <P><FONT SIZE=3D2> How precise NTP can be ? </FONT>
% </P>
%
% <P><FONT SIZE=3D2> Hesham</FONT>
% </P>
%
% <P><FONT SIZE=3D2>-----Original Message-----</FONT>
% <BR><FONT SIZE=3D2>From: Bill Manning [<A =
% HREF=3D"mailto:bmanning at ISI.EDU">mailto:bmanning at ISI.EDU</A>]</FONT>
% <BR><FONT SIZE=3D2>Sent: Wednesday, October 31, 2001 12:43 PM</FONT>
% <BR><FONT SIZE=3D2>To: Elbakoury, Hesham [SC5:323:EXCH]</FONT>
% <BR><FONT SIZE=3D2>Cc: braden at ISI.EDU; =
% end2end-interest at postel.org</FONT>
% <BR><FONT SIZE=3D2>Subject: Re: [e2e] Clock Synchronization =
% Protocols/Algorithms</FONT>
% </P>
% <BR>
% <BR>
%
% <P> <FONT SIZE=3D2>How =
% accurate do you need? NTP can be very precise.</FONT>
% </P>
% <BR>
%
% <P><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% This message is in MIME format. Since your mail =
% reader does not understand</FONT>
% <BR><FONT SIZE=3D2>% this format, some or all of this message may not =
% be legible.</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% ------_=3D_NextPart_001_01C1624C.0D60AA80</FONT>
% <BR><FONT SIZE=3D2>% Content-Type: text/plain;</FONT>
% <BR><FONT SIZE=3D2>% =
% charset=3D"iso-8859-1"</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% Hi Bob</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% I know about NTP. I am looking for =
% other protocols that can provide more</FONT>
% <BR><FONT SIZE=3D2>% accurate clock synchronization.</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% Thanks</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% Hesham</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% -----Original Message-----</FONT>
% <BR><FONT SIZE=3D2>% From: Bob Braden [<A =
% HREF=3D"mailto:braden at ISI.EDU">mailto:braden at ISI.EDU</A>]</FONT>
% <BR><FONT SIZE=3D2>% Sent: Wednesday, October 31, 2001 12:00 PM</FONT>
% <BR><FONT SIZE=3D2>% To: end2end-interest at postel.org; Elbakoury, Hesham =
% [SC5:323:EXCH]</FONT>
% <BR><FONT SIZE=3D2>% Subject: Re: [e2e] Clock Synchronization =
% Protocols/Algorithms</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% *> From =
% end2end-interest-admin at postel.org Wed Oct 31 11:55:34 2001</FONT>
% <BR><FONT SIZE=3D2>% *> From: "Hesham =
% Elbakoury" <helbakou at nortelnetworks.com></FONT>
% <BR><FONT SIZE=3D2>% *> To: =
% end2end-interest at postel.org</FONT>
% <BR><FONT SIZE=3D2>% *> Importance: high</FONT>
% <BR><FONT SIZE=3D2>% *> X-Priority: 1</FONT>
% <BR><FONT SIZE=3D2>% *> MIME-Version: 1.0</FONT>
% <BR><FONT SIZE=3D2>% *> X-Orig: =
% <helbakou at americasm06.nt.com></FONT>
% <BR><FONT SIZE=3D2>% *> Subject: [e2e] Clock =
% Synchronization Protocols/Algorithms</FONT>
% <BR><FONT SIZE=3D2>% *> X-BeenThere: =
% end2end-interest at postel.org</FONT>
% <BR><FONT SIZE=3D2>% *> X-Mailman-Version: 2.0.1</FONT>
% <BR><FONT SIZE=3D2>% *> List-Help: <<A =
% HREF=3D"mailto:end2end-interest-request at postel.org?subject=3Dhelp">mailt=
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% <BR><FONT SIZE=3D2>% *> List-Archive: <<A =
% HREF=3D"http://www.postel.org/pipermail/end2end-interest/" =
% TARGET=3D"_blank">http://www.postel.org/pipermail/end2end-interest/</A>&=
% gt;</FONT>
% <BR><FONT SIZE=3D2>% *> Date: Wed, 31 Oct 2001 11:51:01 =
% -0800</FONT>
% <BR><FONT SIZE=3D2>% *> </FONT>
% <BR><FONT SIZE=3D2>% *> </FONT>
% <BR><FONT SIZE=3D2>% *> I am =
% interested to find out what are the protocols (e.g. NTP) that</FONT>
% <BR><FONT SIZE=3D2>% are</FONT>
% <BR><FONT SIZE=3D2>% *> developed for clock =
% synchronization and their methods </FONT>
% <BR><FONT SIZE=3D2>% *> to =
% reduce/eliminate the effect of jitter in the distribution of</FONT>
% <BR><FONT SIZE=3D2>% *> clock/timestamp informations. =
% This jitter is due to queuing delays and</FONT>
% <BR><FONT SIZE=3D2>% *> S/W packet =
% processing overhead.</FONT>
% <BR><FONT SIZE=3D2>% *> </FONT>
% <BR><FONT SIZE=3D2>% *> Thanks</FONT>
% <BR><FONT SIZE=3D2>% *> </FONT>
% <BR><FONT SIZE=3D2>% *> Hesham</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% Go to the RFC Editor Web page www.rfc-editor.org =
% and search for "NTP".</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% Bob Braden</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% ------_=3D_NextPart_001_01C1624C.0D60AA80</FONT>
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% <BR><FONT SIZE=3D2>% <TITLE>RE: [e2e] Clock Synchronization =
% Protocols/Algorithms</TITLE></FONT>
% <BR><FONT SIZE=3D2>% </HEAD></FONT>
% <BR><FONT SIZE=3D2>% <BODY></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% <P><FONT SIZE=3D3D2>Hi =
% Bob</FONT></FONT>
% <BR><FONT SIZE=3D2>% </P></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% <P><FONT SIZE=3D3D2>&nbsp; I know =
% about NTP. I am looking for other =3D</FONT>
% <BR><FONT SIZE=3D2>% protocols that can provide more accurate clock =
% synchronization.</FONT></FONT>
% <BR><FONT SIZE=3D2>% </P></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% <P><FONT SIZE=3D3D2>&nbsp; =
% Thanks</FONT></FONT>
% <BR><FONT SIZE=3D2>% </P></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% <P><FONT SIZE=3D3D2>&nbsp; =
% Hesham</FONT></FONT>
% <BR><FONT SIZE=3D2>% </P></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% <P><FONT SIZE=3D3D2>-----Original =
% Message-----</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>From: Bob Braden =
% [<A =3D</FONT>
% <BR><FONT SIZE=3D2>% HREF=3D3D"<A =
% HREF=3D"mailto:braden at ISI.EDU">mailto:braden at ISI.EDU</A>"><A =
% HREF=3D"mailto:braden at ISI.EDU">mailto:braden at ISI.EDU</A></A>]</=
% FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>Sent: Wednesday, =
% October 31, 2001 12:00 PM</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>To: =
% end2end-interest at postel.org; Elbakoury, Hesham =3D</FONT>
% <BR><FONT SIZE=3D2>% [SC5:323:EXCH]</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>Subject: Re: =
% [e2e] Clock Synchronization =3D</FONT>
% <BR><FONT SIZE=3D2>% Protocols/Algorithms</FONT></FONT>
% <BR><FONT SIZE=3D2>% </P></FONT>
% <BR><FONT SIZE=3D2>% <BR></FONT>
% <BR><FONT SIZE=3D2>% <BR></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% <P><FONT SIZE=3D3D2>&nbsp; =
% *&gt; From =3D</FONT>
% <BR><FONT SIZE=3D2>% end2end-interest-admin at postel.org&nbsp; Wed =
% Oct 31 11:55:34 2001</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; From: &quot;Hesham Elbakoury&quot; =3D</FONT>
% <BR><FONT SIZE=3D2>% =
% &lt;helbakou at nortelnetworks.com&gt;</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; To: end2end-interest at postel.org</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; Importance: high</FONT></FONT>
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% *&gt; X-Priority: 1</FONT></FONT>
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% *&gt; MIME-Version: 1.0</FONT></FONT>
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% *&gt; X-Orig: =3D</FONT>
% <BR><FONT SIZE=3D2>% =
% &lt;helbakou at americasm06.nt.com&gt;</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; Subject: [e2e] Clock Synchronization =3D</FONT>
% <BR><FONT SIZE=3D2>% Protocols/Algorithms</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; X-BeenThere: =3D</FONT>
% <BR><FONT SIZE=3D2>% end2end-interest at postel.org</FONT></FONT>
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% lt;/A>&=3D</FONT>
% <BR><FONT SIZE=3D2>% gt;</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; Date: Wed, 31 Oct 2001 11:51:01 =3D</FONT>
% <BR><FONT SIZE=3D2>% -0800</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; </FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; </FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt;&nbsp;&nbsp;&nbsp; I am interested to =3D</FONT>
% <BR><FONT SIZE=3D2>% find out what are the protocols (e.g. NTP) that =
% are</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; developed for clock synchronization and =3D</FONT>
% <BR><FONT SIZE=3D2>% their methods </FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt;&nbsp;&nbsp;&nbsp; to reduce/eliminate =3D</FONT>
% <BR><FONT SIZE=3D2>% the effect of jitter in the distribution =
% of</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; clock/timestamp informations. This =3D</FONT>
% <BR><FONT SIZE=3D2>% jitter is due to queuing delays =
% and</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt;&nbsp;&nbsp;&nbsp; S/W packet processing =
% =3D</FONT>
% <BR><FONT SIZE=3D2>% overhead.</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; </FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt;&nbsp;&nbsp;&nbsp; Thanks</FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt; </FONT></FONT>
% <BR><FONT SIZE=3D2>% <BR><FONT SIZE=3D3D2>&nbsp; =
% *&gt;&nbsp;&nbsp;&nbsp; Hesham</FONT></FONT>
% <BR><FONT SIZE=3D2>% </P></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% <P><FONT SIZE=3D3D2>Go to the RFC =
% Editor Web page www.rfc-editor.org and =3D</FONT>
% <BR><FONT SIZE=3D2>% search for =
% &quot;NTP&quot;.</FONT></FONT>
% <BR><FONT SIZE=3D2>% </P></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% <P><FONT SIZE=3D3D2>Bob =
% Braden</FONT></FONT>
% <BR><FONT SIZE=3D2>% </P></FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% <BR><FONT SIZE=3D2>% </BODY></FONT>
% <BR><FONT SIZE=3D2>% </HTML></FONT>
% <BR><FONT SIZE=3D2>% ------_=3D_NextPart_001_01C1624C.0D60AA80--</FONT>
% <BR><FONT SIZE=3D2>% </FONT>
% </P>
% <BR>
%
% <P><FONT SIZE=3D2>-- </FONT>
% <BR><FONT SIZE=3D2>--bill</FONT>
% </P>
%
% </BODY>
% </HTML>
% ------_=_NextPart_001_01C1624F.522E29A0--
%
--
--bill
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