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Radio dispatch systems essentially control and monitor communications between mobile personnel and dispatch operators. Omnitronics has developed a range of dispatch solutions all sharing one common feature – reliability. Over the past 25 years we've gained considerable experience in radio dispatch and continue to develop leading edge products to enhance the effectiveness of radio communications across the world.
The DX-64 Digital Radio Management System
- Digital control of up to 56 channels by up to 32 operators using an intuitive GUI customised to suit the clients needs
- Highly scalable, cost effective, reliable and easy to maintain
- Extensive call logging and rapid recall facilities
- VoIP compatible and access to VHF, UHF, HF and MPT networks
- Radio & telephone integration
See also the 950 Radio Management System
The Omnitronics 950 Radio Management System is an extremely reliable, robust, versatile and cost effective system for small to medium communication operations. This modular system allows for easy expansion for multiple operators and up to 12 radio channels.
See Solutions & Applications sections for example configurations.
- Available Products
- DX-64 Radio Management System
- DX-64 System Control Unit
- DX-64 Operator Interface Card
- DX-64 Tape Monitor Unit
- DX-64 Audio Facilities Interface
- DX-64 Operator Touch Screen
- DX-64 Line Interface Unit
- DX-64 Line Interface Extender
- DX-64 E1 Network Interface Module
- DX-64 Phone Line Interface
- DX-64 Serial Trunking Controller
- DX-64 Rack Frame
DX-64 Digital Radio Management System
The DX-64 is a premiere radio dispatch product, adding to our product line a flexible and expandable platform that continues to share our key product feature - reliability. The DX-64 is a culmination of years of experience in providing radio management dispatch to government agencies, public safety organisations, transport, mining and oil & gas companies. With a fully digital backbone and computer driven user interface this product is packed with features to continually perform under demanding situations.
Reliability is at the core of every Omnitronics product and the DX-64 is no exception. Minimal interconnection between system components, main/standby redundancy for the System Control Unit and hot swapping of interface cards ensures maximum reliability and continuous operation during maintenance.
The DX-64 system offers exceptional value for money considering its extensive range of features, expansion capacity, high quality components and reliability. Modular design ensures that the capacity of the DX-64 is totally flexible and allows the system to grow with the user. The system is capable of handling up to 32 operator positions each of which can control, monitor, group and link a maximum of 56 radio, audio or telephone channels. With systems starting with 2 operators controlling 8 radio channels (see diagram) integrators can offer cost effective solutions knowing that future expansion is ensured.
DX-64 System Control Unit
The heart of the DX-64 is the SCU card. It collects configuration parameters from the operators and initiates all the system control and switching functions. The SCU, due to its critical roll in the system, operates as a main/standby pair. If a failure of the main SCU is detected the hot standby SCU automatically assumes system and network control. The operator is alerted about the changeover but otherwise the change is transparent.
Four digital busses are connected to each SCU providing a total of 56 bi-directional audio channels to the line and 56 bi-directional audio channels to the DX-64 OPR Operator Interface cards. The digital busses are capable of handling 64 channels however 8 of these channels are dedicated to high-speed audio switching information.
The SCU collects channel control and configuration information from the operators via a TCP/IP 10Base-T LAN. This control information is then distributed throughout the components of the DX-64 by a high-speed RS485 bus. This bus is also used to collect diagnostic information that is made available to operators via the LAN.
DX-64 Operator Interface Card
This card services two operator positions. Connection to the operator position from the OPR is via a two wire, twisted pair, digital interface. This interface is similar to, but not compatible with, a standard ISDN interface and provides two bi-directional digital audio channels per operator. The OPR collects information from the SCU to determine which of the 56 channels to present to the operator as foreground and background audio. The selected receive audio channels are mixed by a DSP, combined with associated control information and streamed to the operator. A maximum of 16 OPR cards can be installed in a system providing 32 operator positions.
DX-64 Tape Monitor Unit
Any of the 56 channels can be selected for monitoring. The TMU card has an output capacity of eight channels, each of which is a 600ohm, transformer coupled, analog output. The TMU also presents a control output for each individual channel whenever a PTT or Mute is detected on that configured channel. Up to 7 TMU cards can be installed so that a fully loaded 56-channel system can be monitored.
DX-64 Voice Over IP Interface 
The IPE provides customers with the ability to implement a true distributed radio over IP architecture. Working
in conjunction with the Omnitronics IPR100 and IPR400 products, the IPE enables operators to access shared radios
through a corporate LAN or WAN.
DX-64 Audio Facilities Interface
The AFI is the operators' analog interface to the digital system. Various audio devices such as headsets, desk & gooseneck microphones or handsets are managed by the AFI. Transmit audio is digitised and forwarded to the OPR for connection to the channels selected by the operator. A number of PTT functions are catered for.
Received audio can be arranged into either foreground or background mode allowing the operator to differentiate several sources. Local PABX or PSTN telephone handsets can also be managed by the AFI to provide a convenient single source for all audio control. The AFI also provides an interface to the system's in-built Rapid Recall logger.
DX-64 Operator Touch Screen
Using a standard IBM compatible PC with a Touch Screen, the operator is able to gain access to all audio channels connected to the system. A friendly Graphical User Interface GUI, has been developed to give the operator full control of audio selection, grouping, SELCAL and many other system functions. The PC communicates to the SCU via a standard TCP/IP LAN. It should be noted that if the LAN or the PC fails, operation via the AFI will continue uninterrupted. Omnitronics recognise many clients will request customization of the GUI and this requirement can be met.
A separate Configuration and Maintenance utility is available for System Administrators. This utility allows the administrator to configure operating parameters for the LAN and the DX-64 hardware.
DX-64 Line Interface Unit
The LIU provides an eight-way radio or audio 4 Wire E & M interface to the DX-64. Each channel incorporates SELCAL, DTMF, CTCSS and In-band signalling which are fully controllable at the operator positions. The System Administrator can set up all level controls within the LIU locally by front panel control or by remote signalling. Entertainment channels can also be interfaced into the LIU.
Multiple LIUs can be paralleled onto the digital bus to fully utilise the 56-channel capacity of the DX-64.
DX-64 Line Interface Extender
The Line Interface Extender converts the E1 output from the NIM to TDM format for input to the LIU.
The Line Interface Extender (LIE) is a 1RU sized module that is specifically designed to remotely locate up to three LIU modules (24 radio channels) across a wide area network link. The network interface uses a 2.048Mbps E1 connection.
The LIE must be paired with an E1/NIM card.
The LIE supports the connection of any standard Line Interface Unit, using the 25-way DX64 Bus port. To provide this capability, the LIE was designed to appear like an SCU. This means that the LIE performs many of the hardware and software functions of the SCU.
These functions include:
a) Re-generating the DX64 bus clock and synchronisation signals.
b) Relaying of messages between the controlling SCU and the Line Interface Units.
Messages and radio control & status data are transported across the E1 link using a dedicated 64kbps slot.
DX-64 E1 - Network Interface Module
The E1 interface card is a true, industry standard, E1 protocol interface allowing networking of DX-64 systems and access to audio channels from redundant communication paths. The E1 port has bi-directional capacity of 28 channels, each of which is presented as a remote channel to the operator.
DX-64 Phone Line Interface
The PLI allows the connection of an analog two-wire ring in/loop out telephone line. The line interface incorporates a 2 to 4 wire hybrid that separates the transmit and receive audio, and has other basic features of ringing voltage detect and line seize.
The interface detects when the line is ringing and issues a pulsed PTT command (open collector to ground) to the Tx section of the full duplex radio link. This interface also seizes the line when carrier operated squelch (COS) is detected from the Rx section of the full duplex radio link. When the remote telephone is lifted off hook, this interface detects COS and seizes (loops) the line, causing any ring to cease and the continuous assertion of PTT allowing a full duplex conversation to occur.
DX-64 Serial Trunking Controller
The Serial Trunking Controller and the Line Interface Unit are paired together for a radio trunking solution. The STC interface provides the MAP27 control for MPT1327-compatible radios and the LIU provides the audio interface. As the LIU provides eight radio channels, the Trunking Interface provides eight RS232 control points.
The STC is connected to the DX-64 system via the RS485 bus. The DX64 system uses the RS485 bus to pass information to and from a supervisory controller, which communicates with each individual MAP27 controller.
The trunking interface is addressed in the same way all slave components in the DX64 system currently are, but a logical pairing to a companion LIU also needs to be realised. This means that port 1 of a LIU will be paired with port 1 of a STC.
DX-64 RF - Rack Frame
The rack frame housing the SCU, TMU, OPR and E1 cards, is a 3RU, 19" standard configuration rack assembly. This 3RU with the single 1RU LIU units ensure the system is very economical on rack space.