CHAPTER 4 : GENERAL INFORMATION AND FEATURES
3) If you are unsure whether the electrical service in your building is properly grounded, have
it examined by your municipal electrical inspector.
4) Install a surge protector between the NTU and AC power outlet. Any additional computer
equipment you have connected to the NTU (directly or through another device), such as a
terminal or printer, should also be plugged into the same surge protector. Make sure that
the surge protector is properly rated for the devices you have connected to it.
2.4 Site
Selection
Locate the DT-128 NTU no farther than 50 feet (15.24 meters) from your data terminal
equipment (DTE) and within 6 feet (1.83 meters) of a grounded AC outlet furnishing the
required power.
Install the modem in a clean area that is free from environmental extremes. Allow at least 6
inch (15.24 cm) in front of the modem for access to the front panel, and at least 4 inch (10.2
cm) in back for cable clearance. Position the modem so you can easily see the front panel. Do
not stack the DT-128 on top of another NTU.
•
CAUTION: To avoid overheating the DT-128, do not place anything within 1 inch (2.54
cm) of either side of the NTU, and do not place the NTU on its side.
2.5
AC Electrical Outlet Connection
Check the label on the bottom of the modem for the unit's power requirements. Once you are
certain the power requirements specified on the label match those of your electrical outlet,
plug the DT-128 NTU into the outlet.
Once the DT-128 NTU is installed as described in the previous sections, you may turn the
power on. The NTU performs a self-test before DT-128 NTU greeting message appears on the
liquid crystal display (LCD) on the NTU front panel.
2.6
Connecting with 2-wire/4-wire Line
To connect your NTU to a permissive RJ11 voice jack in 2/4 wire-line, follow this procedure:
1) Connect the 4-pin modular to 4-pin modular cable provided to connect your NTU to the
line set via an RJ11 jack.
2) For the older version (H/W: V3.x, S/W: V2.x), change 2W/4W dip switch from (1,2) pins
ON and (3,4) pins OFF to (3,4) pins ON and (1,2) pins OFF in the rear panel.
3) The newest version (H/W:V4.3, S/W:V3.0) of DT-128 was improved allowing 2W/4W
selection through LCD menu-driven under CONFIG NTU MENU.
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Summary of Contents for DT-128 Series
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