Model 9289
Spectracom Corporation
NetClock/NTP Network Time Provider Instruction Manual
7-12
.
Figure 7-8: System Modem Dial Out Screen (2 of 2)
If the modem is the primary mode of operation for time synchronization, the boot dial-out value
should be set for a very short duration as the unit will not be able to achieve time
synchronization without the modem placing a call. If the modem is strictly a backup to the
external reference, this period can be lengthened to longer than the typical amount of time
needed to synchronize to the external reference.
The System Modem Calibrate screen (Figure 7-9) is used to calibrate the modem for increased
accuracy of the dial-out calls. The calibration procedure is not required but may be used to
provide greater accuracy of future modem calls. The calibration process, using several dial-out
helps compensate for inherit internal software processing lags as well as phone network delays
as well. Different locations may experience different latencies as well as time of day latencies
may also vary.
Summary of Contents for 9289
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