96 SyncServer 600 Series User’s Guide 098-00720-000 Revision D1 – February, 2018
Chapter 4
Navigation Windows
NTP Associations
Use this window to view NTP Associations.
Root Delay This is a measure of the total round trip delay to the root of the synchronization
tree. A typical value for a SyncServer operating at stratum 1 would be 0 since the
SyncServer is a root of the synchronization tree For other stratum levels, an
appropriate value is displayed. Depending on clock skew and dispersion, this
value could be positive or negative.
Root
Dispersion
This is a signed fixed-point number indicating the maximum error relative to the
primary reference source at the root of the synchronization subnet, in seconds.
Only positive values greater than zero are possible.
Reference ID This is a four-byte field used to identify the reference clock source. At
initialization, while the stratum is 16, this field shows the progression of the NTP
clock PLL. The field will start with a value of INIT (may be displayed as
73.78.73.84, the ASCII decimal values). Once a peer has been selected, the
clock may be stepped, in which case the reference ID field will change to STEP
(or 83.84.69.80). Once the PLL is locked, the stratum will be updated and the
reference ID will identify the selected peer. In the case of a SyncServer operating
at stratum 1, the reference ID will display the source for the local timing reference
(e.g., GNSS, IRIG, FREE). In the case where the selected peer is another NTP
server, the reference ID will display the IP address of the server or a hash unique
to the association between the SyncServer and the remote server.
Reference
Time
The time when the SyncServer last received an update from the selected peer.
Represented using time stamp format in local time. If the local clock has never
been synchronized, the value is zero. A time stamp of zero corresponds to a local
time of Thu, Feb 7 2036 6:28:16.000. This value is typically updated every 16
seconds for a locally attached hardware reference (e.g., GNSS, IRIG) and in an
interval of 64- 1024 seconds for a readily accessible remote NTP server.
System Jitter Jitter (also called timing jitter) refers to short-term variations in frequency with
components greater than 10 Hz.
Clock Jitter Jitter (also called timing jitter) refers to short-term variations in frequency with
components greater than 10 Hz.
Clock Wander
Broadcast
Delay
The broadcast and multicast modes require a special calibration to determine
the network delay between the local and remote servers. Typically, this is done
automatically by the initial protocol exchanges between the client and server.
This is the broadcast or multicast delay reported by the NTP daemon.
Symm Auth
Delay
When NTP authentication is enabled and performed on outgoing NT
P packets,
this adds a trivial amount of fixed delay that can be removed based on the
authdelay value. This value is always set to zero on the SyncServer.
Table 4-5. NTPd SysInfo Parameter Descriptions (Continued)
Parameter Description
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