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Multiline Voice Terminals
The system supports MET (10- and 12-button only) and MERLIN (7300H Series) multiline
voice terminals.
Multiline voice terminals have two LEDs located beside each assignable button (except for
the 34-button basic set). The LEDs are referred toas I-Use (red) and Status (green) LEDs.
Additional information on the LEDs is provided in the “Line Status and I-Use Indications”
feature description in Section 2.
Most multiline voice terminals support adjuncts. The supported adjuncts are described
following the voice terminal descriptions.
Multilane voice terminals can have more than one call appearing at the terminal at onetime.
Each multiline terminal has two System Access buttons on which calls can be made or
received. System Access buttons are, essentially, inside line buttons.
Multilane voice terminals transmit voice signals in analog form and control signals in digital
form. The terminals operate over Premises Distribution System 4-pair wiring.
7300H Series Voice Terminals:
These voice terminals are the same as those used with
MERLIN Communications Systems.
They connect to ports on the Analog Terminal Link
(ATL) Line (ZTN79) CP. The ATL Line CP converts the analog voice signals to digital form
before placing them on the TDM bus.
Three-wire pairs connect these sets to the port CPs;
see “Port Specifications
“ in Section 5 for details.
The dial pad on 7300H series terminals is not a touch-tone pad in that the signals generated
are digital, not DTMF signals.
A digital signal is sent to the switch with each button press.
Reference to the dial pad on these sets throughout this manual is in the form, “touch dial
pad.”
MET Sets: The MET Sets are not orderable as part of the system equipment but can be
used in System 25 installations, where appropriate (i.e., in reuse situations). Three-wire
pairs connect these sets to the port CPs; see “Port Specifications” in Section 5 for details.
The TN735 MET Line CP converts the analog voice signals to digital form before placing
them on the TDM bus. The touch-tone dial pad on MET voice terminals generates DTMF
signals.
The following subsections provide descriptions and illustrations of the multiline voice
terminals supported by System 25.
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