Spectracom Corporation
Model 9289
NetClock/NTP Network Time Provider Instruction Manual
7-15
Figure 7-10: Modem Test Screen
There are four different types of modem dial-out calls that can be made. The call type is
determined by the state of the system (after the call is finished) as well as user input.
Calibration calls happen upon a user request. Time verification calls happen on a user specified
interval if holdover is entered from time synchronization with another source. Time
synchronization calls occur when time synchronization is lost and on a user specified interval
until another time source is available. Modem test calls happen when no calls have been made
for a user specified time, or upon a user request. Because the modem determines how to use a
Summary of Contents for 9289
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