Model: MC-1-M (2U)
Doc. Ref. no. : m05/om/101
Issue no. 14
User’s Manual
Page 74 of 103
Below are the list of some of all NTP packet parameters which are functionally significant with respect to
NTP server.
mode 3-bit integer representing the mode with value “4”, means that GPS Master Clock Model MC-1-M
device act as NTP server device and can provide time output for synchronization to NTP client devices
but will never be synchronized by clients.
Peer clock stratum 8-bit integer representing the stratum with value “1”, which means that GPS Master
Clock Model MC-1-M act as primary reference source. Stratum value will be fixed at 1 during GPS Master
Clock Model MC-1-M Lock conditions. However, it can be configured between 2 to 15 (via telnet) which
will only be applicable during GPS Master Clock Model MC-1-M Unlock conditions.
Clock precision This is an eight-bit signed integer indicating the precision of the local clock, in seconds
to the nearest power of two. GPS Master Clock Model MC-1-M is having its internal clock precision of 1
us (1 microseconds = 0.000001s).
Reference Clock identifier This is a 32-bit code identifying the particular reference clock. As GPS
Master Clock Model MC-1-M is stratum 1 primary reference source, it’s reference identifier is designated
as “GPS”.
Transmit Timestamp Time of the server when the NTP response left for the NTP client, in NTP
timestamp format. NTP timestamps are represented as a 64-bit unsigned fixed-point number, in seconds
relative to 0h on 1 January 1900 in terms of UTC. The integer part is in the first 32 bits and the fraction
part in the last 32 bits. GPS Master Clock Model MC-1-M provides time format in seconds and fractional
timestamp with a millisecond resolution.
If the stratum level of GPS Master Clock Model MC-1-M device is configured
at 15 under Unlock conditions, no NTP client will synchronize its time with
NTP server output as level 15 is the last limit of stratum as per NTP standard
11.3.3 NTP Client Synchronization:
GPS Master Clock Model MC-1-M NTP output port can be used to synchronize of Windows PC or
Unix/Linux based PC in networks. Please refer Appendix C for procedure/settings for making PC to
operate as NTP client. It is recommended to visit website
www.ntp.org
for installing and configuring
Unix/Linux based PC as NTP client.
GPS Master Clock Model MC-1-M is available with NTP Utility software which can be used to synchronize
Windows PC as NTP client device. If NTP Utility software is used, there is no need to do regedit settings
in Windows PC for NTP client configuration.
NTP Client time accuracy depends on multiple factors such as Client local clock frequency ppm, network
load and congestion, type of clock synchronization algorithm in NTP Client devices other than Unix/Linux
PC, hierarchical arrangement of NTP servers and NTP clients in network and GPS Master Clock Model
