PTPDELTATIME

Time Difference Between Local Clock and Reference Clock

Platform:

OEM729, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7-I, SMART7-SI

This log provides information regarding the time difference between the receiver's current GPS time as used in log headers and the time provided by the grandmaster clock currently recognized by the receiver.

Message ID: 2465

Log Type: Asynchronous

Recommended Input:

LOG PTPDELTATIMEA

ASCII Example:

#PTPDELTATIMEA,COM1,0,65.5,FINESTEERING,2197,243640.000,02000020,cdba,32768;PASSIVE,002166FFFE012868,128,128,248,FE,65536,B0D5CCFFFE417085,127,128,248,FE,65535,TRUE,1538942729.217678,0.2345e-2,-0.2456077e-5,0.123456e-9*fd50a30c

Field	Field Type	Description	Format	Binary Bytes	Binary Offset
1	Log header	PTPDELTATIME header For information about log headers, see ASCII, Abbreviated ASCII or Binary.	–	H	0
2	PTP State	Current PTP state (see Table: PTP States)	Enum	4	H
3	Clock Identity	Local clock identity	Hex[8]	8	H+4
4	Priority1	Local clock priority1	Uchar	1	H+12
5	Priority2	Local clock priority2	Uchar	1	H+13
6	Clock Class	Local clock class	Uchar	1	H+14
7	Clock Accuracy	Local clock accuracy	HexByte	1	H+15
8	Offset Scaled Log Variance	Local clock offset scaled log variance	Ushort	2	H+16
9	Reference Clock Identity	Reference clock identity	Hex[8]	8	H+18
10	Reference Clock Priority1	Reference clock priority1	Uchar	1	H+26
11	Reference Clock Priority2	Reference clock priority2	Uchar	1	H+27
12	Reference Clock Clock Class	Reference clock class	Uchar	1	H+28
13	Reference Clock Clock Accuracy	Reference clock accuracy	HexByte	1	H+29
14	Reference Clock Offset Scaled Log Variance	Reference clock offset scaled log variance	Ushort	2	H+30
15	Time Offsets Valid	Indication that the offsets fields are valid	Bool	4	H+32
16	Time Offset	Filtered local PTP clock time – grandmaster time (seconds)	Double	8	H+36
17	Time Offset Variance	Filtered time offset variance (seconds²⁾	Double	8	H+44
18	Fractional Frequency Offset	Filtered (Local clock frequency - reference clock frequency) / reference clock frequency	Double	8	H+52
19	Fractional Frequency Offset Variance	Filtered fractional frequency offset variance	Double	8	H+60
20	*	Delimiter separating log info from CRC (ASCII only)	–	–	–
21	xxxx	32-bit CRC (ASCII and Binary only)	Hex	4	H+68
22	[CR][LF]	Sentence terminator (ASCII only)	–	–	–

PTP States
Binary	ASCII	Description
1	INITIALIZING	Data sets, hardware and communication facilities are being initialized.
2	FAULTY	A fault has been detected and PTP activity is halted.
3	DISABLED	The port is disabled.
4	LISTENING	Listening for announce messages to determine if a better grand master is active.
5	PRE_MASTER	About to enter MASTER state.
6	MASTER	Acting as a PTP master.
7	PASSIVE	Equivalent to SLAVE state when the clock class < 128.
8	UNCALIBRATED	Preparing to enter SLAVE state.
9	SLAVE	Reporting time difference between the receiver and the selected foreign master.