Model: MTS200 (1U)
Doc. Ref. no. : - m08/om/201
Issue no.: 03
Page 141 of 195
User’s Manual
Figure 11-8 NTP Server Status on Webserver
“NTP Process Status” filed in above image indicates the output of ntp driver as similar as ntpq –p
command output. Below are description of each parameters.
remote
= list of all ntp and time servers available as per defined in /etc/ntp.conf file.
refid
= reference name as per individual time servers
st
= current stratum value of the ntp server
when
= seconds since last ntp request
poll
= current applicable ntp query poll interval (in seconds) with respective ntp server as per defined
in /etc/ntp.conf file.
reach
= The value displayed in column reach is octal, and it represents the reachability register. One
digit in the range of 0 to 7 represents three bits. The initial value of that register is 0, and after every
poll that register is shifted left by one position. If the corresponding time source sent a valid response,
the rightmost bit is set.
During
a
normal
startup
the
registers
values
increment
in
stages
as
per 0, 1, 3, 7, 17, 37, 77, 177, and 377.
delay
= this indicates the delay (In milliseconds) in ntp query and response
offset
= time difference (in milliseconds) between client and ntp server.
jitter
= variance of time offset (in milliseconds).
“NTP Drift value” shows the current PPM of internal NTP driver in kernel which is syncing with ntp server.
This PPM value is not the PPM accuracy of GPS unit as basic MTS200 supplied is with TCXO or optional
OCXO based.
“NTP Kernel Information” is the ntp driver output generated by kernel of internal operating system. This
output provides more detail information regarding ntp kernel information.
Below image shows the ntp “loopstats” statistics information in graphical format. NTP driver is storing this
statistics information each day of normal ntp operation and provides output of same with information of
offset, ntp clock PPM at every configured poll interval. Maximum of latest 10 days of statistics files are
logged in internal system. The graph shows the ntp offset with server in blue line and ntp clock PPM
value with red line both with respect to UTC time in statistics file.
