Instruction manual

HARDWARE DESCRIPTION
Multiline Voice Terminals
The recommended multiline terminals for System 25 is the ATL cordless telephone and the
7300H Series hybrid sets that are also used with the MERLIN Communications System.
Multibutton Electronic Telephone (MET) sets already available to the customer can be reused
in a System 25 installation but are not orderable.
Multiline voice terminals have programmable buttons that can be assigned for handling calls
and for controlling features.
Many of these buttons are supported by red I-Use and green
status indicators (LEDs) that provide users with information about calls and features. Fixed
(non-programmable) feature buttons allow users to control standard features such as Hold,
Conference (except ATL cordless), and Transfer.
Multiline terminals can have several calls active at the same time depending on the number
of buttons programmed for placing and receiving calls. For example, the user can be talking
on one call, have one or more calls on hold, and still receive ringing on incoming calls.
Transmission to and from the terminals is hybrid: an analog pair for voice and two digital
pairs for control signals.
Port circuits (ZTN79 ATL Line CP for MERLIN System and ATL
cordless sets and TN735 MET Line CP for MET sets) provide interface between the terminals
and the digital switch.
The pushbutton dials on MERLIN System terminals and ATL cordless telephones are not
touch-tone; they send digital signals to the system switch and are referred to in terminal
descriptions as a touch dial pads. MET sets have touch-tone (DTMF) dials.
The following subsections provide descriptions and illustrations of the multiline voice
terminals supported by System 25.
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