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1
DVI-100
Digital Voice Interface for
TETRA-Infrastructure
About TETRA
• TETRA (TErrestrial Trunked RAdio) is a
digital standard similar to GSM for voice
and data applications.
• All voice data will be processed and
encoded into a digital bit stream at the
sender side and decoded back to “analog
audio” on the receiver side.
• During the whole transmission process
within the TETRA infrastructure this digital
voice data remains a digital 1-0-1… bit
stream.
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The CoDec
• The CoDec (Coder / Decoder) used for the TETRA voice
process operates using an so called ACELP algorithm.
• (ACELP Algebraic CELP, CELP Code-Excited Linear
Predictive)
• The result is a fantastic TETRA audio quality for
special use in extreme environment as for Police,
Firefighters, Ambulance and other (industrial)
applications
DVI-100
• The DVI-100 (Digital Voice Interface) is a
special TETRA terminal, that feeds all
received TETRA voice signals to its
Ethernet (IP) port and vice verse, without
any conversion to analog. So there is no
reduction of the original TETRA voice
quality.
• Additional also Status and SDS messages
are forwarded to the DVI Ethernet port and
sent to a (any) destination IP (and vice
verse).
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DVI-100
• The DVI-100 can be operated in Server and in Client
Mode and can be used as follows:
– DVI Client to DVI Server [Back-to-Back]
– DVI Server to Infrastructure switch
– DVI Server to PC / iPhone / (iPad)
– TETRA MicroSPOT – DVI in DMO mode
Back To Back
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Through Satellite Link
Through Satellite Link
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Fallback Mode
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TETRA to non-TETRA
DVI100 with multiple group talks
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DVI-100 in DMO mode
• The DVI-100 can be operated in DMO Mode
and can be used as a TETRA Micro-Spot:
– Connected to a DVI-Server
– Connected to a PC / iPhone / iPad
– Connected to a TETRA Infrastructure switch
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DVI-100 Features
• Connect TETRA networks of different manufacturer
• Connect TETRA networks with different frequencies (380
MHz / 800 MHz)
• In house coverage
• Access to the own TETRA network from out of the
coverage area (Paris – Cologne)
• Temporary Micro-Spot (on site)
• Dispatcher
• Design your own application
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PC GUI
• The PC GUI
• Up to 10 “local” IP user displayed
• Up to 10 TETRA groups displayed
• Supervisor Mode (can change the active group)
• All PTT, SDS and Status are displayed with Time
Stamp and stored in a csv-database
• PTT Push To Talk button
• Signaling according to TETRA terminals
• SDS send feature
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iPhone and iPad GUI
• Up to 10 “local” IP user displayed (*)
• Up to 10 TETRA groups displayed (*)
• Supervisor Mode (can change the active group)
(*)
• All PTT (*), SDS and Status are displayed
• PTT Push To Talk button
• Signaling according to TETRA terminals
• SDS send feature (*)
• (*) iPad only
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