LT-3100 User & Installation Manual Rev. 1.06 Installation and Mounting
Lars Thrane A/S www.thrane.eu Page 9 of 155
LT-3120 Handset
The LT-3120 Handset is the primary voice interface for the LT-3100 system. The LT-3120 Handset must be
connected on the front of the LT-3110 Control Unit. The connector is illustrated in Figure 2 on page 6.
The LT-3120 Handset is connected to the LT-3110 Control Unit via a 5-pin proprietary angle connector. The
spiral cord, fixed to the LT-3120 Handset is ~ 0.4 m from handset to connector, when coiled. The spiral cord
can be stretched to a maximum of 2 m. The LT-3120 Handset is designed for indoor mounting. Check the
specifications in App. G - Specifications on page 145.
The LT-3120 Handset has the following characteristics:
• High-performance audio speaker and microphone
• Separate ringer (buzzer)
• Speaker volume control (double-button, marked with ‘+’ and ‘-‘, for volume up and down)
• Built-in off-hook detection circuit
NOTE: The LT-3110 Control Unit will inform the user if the LT-3120 handset is not properly
connected to the LT-3110 Control Unit. A BAM alert will be activated (Lost handset).
NOTE: The LT-3120 Handset must be operated together with the LT-3121 Cradle, for the off-hook
detection circuit to work. The LT-3121 Cradle is described in LT-3121 Cradle on page 10.
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