S100 User Guide – Rev. D – June 2005 35
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GPSIf you choose GPS (see Figure 3-16) and click Next, the Dialup Backup dialog is
displayed. If you wish to use dial-up as a backup time source to GPS, click the checkbox next
to Use dialup as backup to GPS, then click the Next button.
If you do not want to back up your GPS time source with dial-up, leave the checkbox
unselected, and click Next, which will open the System Information dialog (see Figure 3-
20).
If you check Use dialup as backup for GPS, this Dialup Settings dialog is displayed. In
Options, if you wish to use ATDP (pulse dialing), check the box, otherwise the S100 uses
standard ATDT (dial tone) dialing.
In the Modem Phone Number field, enter the NIST phone number preceded by any
prefixes that might be required to reach those numbers. A “9,” (nine comma) prefix gets an
outside line from an office phone; the comma introduces a one-second delay before the
remaining numbers are dialed. The “1” prefix is required for long distance dialing in the US.
Figure 3-18: Dialup Backup
Figure 3-19: Dial-up Settings