
INSTALLATION
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System 2 Installation / Programming Manual
Modems
Phone Modems
Dial-up telephone modems can be used for remote programming. One modem is needed at the System 2
location and one at the VDT location. You will need to use a dedicated telephone line with dial tone for access
to the System. For proper wiring of modems refer to Figure 11 and Figure 12.
To setup your modem refer to Chapter 10.
Short-Haul Modems
Short-Haul Modems may be used to extend the distance from the System 2 to a VDT. If the VDT is located
more than 100 ft. from the Access panel, Short-Haul Modems are necessary. With the addition of Short-Haul
Modems, the VDT’s distance can be increased to 1.25 miles. Short-haul modems require four conductors
between each modem. The wire can be two pair of existing, unused telephone cable and does not need to be
shielded. Refer to Figure 12.
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