Symmetricom TimeProvider 2700 User Manual

098-00564-000 Revision A3 – July, 2013 TimeProvider 2300/2700 User’s Guide 303
Appendix B Specifications and Factory Defaults
Specifications
Figure B-2. TOD China Mobile Frame Structure
Table B-16. TOD China Mobile Frame Details
Field Name Field Length Description
Sync Char 1 1 byte Part of Frame Header
0x43 = ASCII character “C”
Sync Char 2 1 byte Part of Frame Header
0x4D = ASCII character “M”
Class 1 byte Basic classification of TOD China Mobile
message
ID 1 byte Serial number of TOD China Mobile message
Length 2 bytes Length of payload only
(Does not include Frame Header, Message Header,
Length Field itself, or FCS)
Payload 16 bytes Contains the message content
See
Table B-17, Table B-18, and Table B-19
for Time Message details.
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.

Symmetricom TimeProvider 2700 Specifications

General

Brand	Symmetricom
Model	TimeProvider 2700
Category	Network Hardware
Language	English