Symmetricom TimeProvider 5000 User Manual

098-00028-000 Revision F – May, 2012 TimeProvider 5000 User’s Guide 435
Appendix B Specifications and Factory Defaults
Specifications
Payload 16 bytes Contains the message content
Two TOD messages have been defined:
 Time Information Message
(see
Table B-9 for payload contents)
 Time Status Message
(see
Table B-10 for payload contents)
See
Table B-11 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-9. TP 5000 - Time Information Message Payload Contents for 1PPS+TOD Input
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-8. TP 5000 - TOD Frame Field Descriptions for 1PPS +TOD Input
Field Name Field Length Description

Symmetricom TimeProvider 5000 Specifications

General

Brand	Symmetricom
Model	TimeProvider 5000
Category	Server
Language	English