DX-64 adds to our product line a flexible and expandable platform
that will complement our 950 and 990 series of Radio Management
Systems. With a fully digital backbone and computer driven user
interface this product can offer the features required in demanding
was also a prime consideration in the design of the DX-64. Minimal
interconnection between system components, main/standby redundancy
for the System Control Unit and hot swapping of interface cards
ensures maximum reliability and continuos operation during maintenance.
the most appealing factor of the DX-64 is its price. Considering
the available features, expansion capacity and quality, the DX-64
offers outstanding value for money.
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 are able to offer cost
effective solutions knowing that future expansion is ensured.
SCU - 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. The hot standby SCU automatically
assumes system and network control if a failure of the main SCU
is detected. The operator is alerted about the changeover but otherwise
the change is transparent.
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.
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 which is made available to operators via the LAN.
OPR - 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.
TMU - Tape Monitor Unit
Any of the 56 channels can be selected for monitoring. The TMI card
has an output capacity of eight channels, each of which is a 600ohm,
transformer coupled, analog output. The TMI also presents a control
output for each individual channel whenever a PTT or Mute is detected
on that configured channel. Up to 7 TMI cards can be installed so
that a fully loaded 56 channel system can be monitored.
AFI - 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.
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 inbuilt Rapid Recall logger.
PC/TS - Operator Touch Screen Control
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. BISS Technologies
recognise many clients will request customisation of the GUI and this
requirement can be met.
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.
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LIU - 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.
All level controls within the LIU can be setup locally by front panel
control or remotely by the System Administrator. Entertainment channels
can also be interfaced into the LIU.
LIUs can be paralleled onto the digital bus to fully utilise the
56 channel capacity of the DX-64.
DX-64 E1 - Network Interface
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 will have
bi-directional capacity of 28 channels, each of which is presented
as a remote channel to the operator.
RF - Rack Frame
The rack frame housing the SCU, TMI, 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