13 - 136 WiNG 5.6 Access Point System Reference Guide
13.3.30.2 NTP Association
Network Time
The interaction between the access point and an NTP server constitutes an association. NTP associations can be either peer
associations (the access point synchronizes to another system or allows another system to synchronize to it), or a server
associations (only the access point synchronizes to the NTP resource, not the other way around).
To view the access point’s NTP association statistics:
1. Select the Statistics menu from the Web UI.
2. Select System from the navigation pane (on the left-hand side of the screen). Expand a RF Domain and select one of its
connected access points.
3. Select Network Time and expand the menu to reveal its sub menu items.
4. Select the NTP Association tab.
Figure 13-92 Access Point - NTP Association screen
Precision Displays the precision of the time clock (in Hz). The values that normally appear in this field
range from -6, for mains-frequency clocks, to -20 for microsecond clocks.
Reference Time Displays the time stamp the access point’s clock was last synchronized or corrected.
Reference Displays the address of the time source the access point is synchronized to.
Root Delay The total round-trip delay in seconds. This variable can take on both positive and negative
values, depending on relative time and frequency offsets. The values that normally appear in
this field range from negative values (a few milliseconds) to positive values (several hundred
milliseconds).
Root Dispersion The difference between the time on the root NTP server and its reference clock. The reference
clock is the clock used by the NTP server to set its own clock.
Stratum Displays how many hops the access point is from its current NTP time resource.
Refresh Select the Refresh button to update the screen’s statistics counters to their latest values.
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