444 TimeProvider 5000 User’s Guide
098-00028-000 Revision F – May, 2012
Appendix B Specifications and Factory Defaults
Specifications
Payload
16 bytes
Contains the message content
Two TOD messages have been defined:
for payload contents)
for payload contents)
See
for TOD message data type
definitions
Frame Check
Sequence
(FCS)
1 byte
Generating polynomial FCS is:
G(x) =
x
8
+
x
5
+
x
4
+1
Initial value of FCS is set to 0xFF, and there is
no need to negate the input data. Checksum
calculation uses right-shift calculation, and
there is no need to negate the output frame
check data. When the frame check sequence
is transmitted, the LSB (bit 0) is transmitted
first.
Table B-15. TP E30 - Time Information Message Payload Contents for 1PPS+TOD Outputs
Byte
Offset
Data
Type
Name
Units
Notes
0
U4
Time of Week (TOW)
seconds
GPS Second time of week
4
I4
Reserved
Reserved
8
U2
Week Number
GPS week (GPS time), 16 bits
Whole weeks since 1980-01-06
10
I1
LeapS
seconds
Leap Seconds (GPS-UTC)
Table B-14. TP E30 - TOD Frame Field Descriptions for 1PPS +TOD Output
Field Name
Field Length
Description
Summary of Contents for TimeProvider 5000
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