Using the Model 390 multidrop capability, several Model
390s—for example along the length of a tunnel—can have
access to a single TETRA radio. For the operator who is
out of the network area or perhaps wants access to a
network in another region, the Model 390 fitted with the
Model 232 Interface gives true remote access over dial up
telephone line, private wire or ISDN. Use of the dial up line
or ISDN means connection costs are only incurred when
the Model 390 is in use.
Organizations with remote offices in different cities or
even countries can access a distant regional TETRA
network and have the same functionality as a local radio.
For public network operators this is a revenue opportunity,
bringing in organizations which otherwise may not
subscribe because their offices are out of the coverage
area.
For private networks, the Model 390 extends the effective
range of the network and allows personnel in one region
to have direct access to a network in another region.
This is valuable to organizations—such as utilities—with
personnel in different regions.
Organizations such as emergency services can also get
access to each other's regional networks including direct
access to an isolated site when the network is in fallback
mode.
For many office based personnel, the Model 390 with
optional desk microphone, headset, footswitch and
external speaker is a preferable presentation to having
a fixed radio. It allows the radio to be sited for optimum
coverage, while bringing the controller to the desk of the
operator.
Where multiple operators need radio access, up to fifteen
Model 390s can share a single TETRA radio. Supervisory
control and intercom between Model 390s is
also included.
descriPtion
The Model 390 is a robust telephone style controller with
a large, easy-to-read LCD display and handset. Each unit
has an individual rotary volume control, numeric keypad
and function buttons. The function buttons match the radio
making the operation simple and intuitive for any operator
familiar with the MTM300/700. LED button indicators
show which functions are activated and the presence of
incoming messages in the stack.
The Model 390 supports the same languages as the radio,
including English, German and French. Typical information
displayed includes operating mode, current call
information, alarm symbols, status and data information,
speed call names and signal strength from the radio
system.
The handset includes a push-to-talk press bar and a built-in
speaker and microphone allows hands-free operation.
Hands-free intercom between all controllers is possible
in a multiple controller system. Mute operation enables
the operator to take incoming calls and hand-off to other
positions.
An automatic gain control (AGC) regulates the transmit
and receive audio. All radio progress tones received at
the MTM300/700 are passed to the Model 390 for ease
of operation and operator confidence. Duplex operation is
available.
The system consists of a compact radio interface, located
at the MTM300/700 radio, and one or more desktop
controllers. Several controllers can be connected to the
radio interface, each up to a distance of 600m from the
radio interface.
For true remote applications a pair of Model 232 units
are used between the controller and the Zetron radio
interface supporting dial up telephone, private wire or
ISDN connection. Several controllers can share access to
a single controlling Model 232. See separate Model 232
brochure for other operation details.
Each controller comes pre-configured and ready to install,
but Model 390s can be individually customized to meet
specific requirements. A range of external accessories can
be added including an external desk microphone, headset,
footswitch, external amplified speaker and tape recorder.
Out-of-Area Access
