Hands-Free Unit (HFU). Provides the voice terminal user with full speakerphone capability. This includes hands-free telephone conversation, on-hook dialing, monitor-on-hold, and teleconferencing at a short distance from the voice terminal. To use this accessory, you must program AUtO Answer- Intercom. The HFU is for use with all analog voice terminals

except 5-button and 10-button HFAI. An HFU used with a 7406D voice terminal requires a local power unit.

Headset-and-Headset- Adapter. Enables a user to answer and listen to calls without lifting the handset. The headset and headset adapter is for use with all analog voice terminals except 5-button and 10-button HFAI.

In-Range, Out-of-Building (IROB) Analog Voice Terminal Protectors. A voice terminal can be placed in another location outside of the main building but within 1000 feet of the MERLIN H system control unit. IROB protectors protect the control unit and voice terminal from exposure to lightning, contact with power lines, and power currents induced by nearby power lines.

Loudspeaker Paging System. An optional loudspeaker paging system allows people with MERLIN II system voice terminals to page co-workers and/or make announcements through loudspeakers.

Music Coupler. A music coupler connects a music source (such as a cassette player) to the MERLIN II system. It also provides a secondary bridged connection to provide Music-on-Hold. In addition, it allows the music source to be connected to a loudspeaker paging system to provide background music at the same time.

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AT&T 518-600-016 manual System Hardware