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Model 1108 User’s Manual
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Figure 2-1. Wall Mount
2.3 Power Surge Protection
The Model 1108 can be damaged by power surges and light-
ning through the telephone line and the 120 VAC power supply.
Although the Model 1108 has built-in surge protection, we
recommend that ad ditional pr otection be obtained f or the
unit and f or an y electr onic equipment that is attac hed to
your power supply and telephone lines. Power surge
protection is especiall y impor tant if y ou live in a lightning-
prone area. The ISOTEL Surge Protector Model IB-4 is
available through Phonetics. See Appendix B.
2.4 Power Supply and Battery Backup
The Model 1108 is provided with an AC power transformer
that will plug into any standard 120 VAC outlet and a battery
backup (batteries not included) that enables the unit to continue
functioning if AC power is removed (due to electric power
disruption or failure). The Model 1108 uses six, D-cell alkaline
batteries. Do not use rechargeable nicad batteries.
NOTE
Be sure that the AC transformer is plugged into
an outlet before installing batteries.
To install the batteries, open the battery compartment hatch
located underneath the unit, align batteries according to the
diagram shown in Figure 2-2, and replace the hatch.