Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.02.xx and greater

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Configuring the ProCurve Wireless Edge Services xl Module
Enabling Secure Network Time Protocol (NTP)
By tracking timestamps for all NTP exchanges, the Wireless Edge Services xl
Module calculates the following:
■ Root Delay—a 32-bit signed fixed-point number indicating the total round-
trip delay to the primary reference source, in seconds with fraction point
between bits 15 and 16
Note that this variable can take on both positive and negative values,
depending on the relative time and frequency offsets. The values that
normally are displayed in this field range from negative values of a few
milliseconds to positive values of several hundred milliseconds.
■ Root Dispersion—a 32-bit unsigned fixed-point number indicating the nom-
inal error relative to the primary reference source, in seconds with frac-
tion point between bits 15 and 16
The values that normally are displayed in this field range from 0 to several
hundred milliseconds.
■ Delay—the number of milliseconds required for NTP packets to make the
round-trip from the module to the remote server and back
The delay is an important factor when the module selects the “best” server.
Minimizing delay is one reason why you want to pick servers that are close
to you.
■ Offset—the difference in milliseconds between the clocks in your host and
the remote resource
As clocks synchronize, the offset decreases. Your mode and the mode of
the peer, as well as other factors, dictate whether the module synchronizes
to the remote resource.
■ Dispersion—a measure, in seconds, of how scattered the time offsets have
been from a given time server
■ Precision—an eight-bit signed integer indicating the precision of the local
clock, in seconds to the nearest power of two
The values that normally are displayed in this field range from -6 for mains-
frequency clocks to -20 for microsecond clocks found in some worksta-
tions.
To refresh the screen, click the Refresh button.
To close the screen, click the Close button.