AT&T MERLIN Attendant for MERLIN LEGEND Installer's Manual page 19

Installation and MERLIN LEGEND System Programming
intended to be connected directly to the network. The location for the MERLIN
Attendant must meet the following criteria:
Within 5 feet of a properly grounded ac power source that is not
controlled by a switch.
NOTE:
If possible, the MERLIN Attendant should share the same power source
with the MERLIN LEGEND system control unit. This is required when
the MERLIN LEGEND system control unit is connected to an
Uninterruptible Power Supply (UPS).
Not more than 10 feet away from the MERLIN LEGEND system control
unit. If the MERLIN Attendant is located more than 10 feet from the
control unit, the MERLIN Attendant may drop some calls.
A sufficient distance away from a heating or cooling source to prevent
exposure to temperatures beyond 32°F to 104°F (0°C to 40°C).
Equipment and Location Requirements
1-9