MicroComm DXI - Harding Instruments

MicroComm DXI - Harding Instruments
MicroComm DXI
DXI-400 Series
System Description
Audio Interface Modules
The MicroComm DXI correctional intercom system is designed
and built to satisfy the needs of the correctional environment. It is
flexible, rugged, reliable, easy to install, and easy to expand.
Audio interface modules are used to connect intercom stations,
audio inputs, and audio outputs to the DXI processing and control
equipment. Inputs may include microphones, program sources,
etc. and outputs could be public address, audio monitoring and
audio recording equipment. Some audio interfaces incorporate
both input and output signals such as telephones, two-way radios,
The basic function of the MicroComm DXI is to provide twoway voice communications; either between master stations, or
between a master station and an intercom station. It also includes
public address and music distribution, system integration, point
monitoring and control, and other ancillary features that enable
it to form part of a facility’s total operational plan.
System Architecture
The MicroComm DXI system is based upon a flexible modular
architecture which allows it to be configured to suit the specific
General function audio boards include Audio Input Boards (AIBs),
Audio Output Boards (AOBs), and Audio Input and Output Boards
(AIOs). Together, they are designed to transmit and receive a
wide range of signal levels and to interface to virtually any audio
component. DXI software programming sets the signal range and
level of each audio channel, and determines how it will function
as part of the system.
The functional elements used to construct a DXI system are;
system processing and administration, switching and control,
device interfaces, and devices. These are interconnected with
different types of networks and discrete wiring, depending upon
their location and communication requirements.
Some audio interface modules are specialized and perform a
unique function. Station Audio Boards (SABs) connect intercom
stations to the system, Paging Amplifier Boards (PABs) provide a
direct connection to constant voltage loudspeaker circuits, and
Telephone Set Boards (TSBs) allow standard DTMF telephone sets
to serve as communication devices.
Service, Administration and Control Computer
Monitor and Control Modules
Service, Administration and Control (SAC) computers provide the
processing for the system’s operation as well as its configuration
and maintenance functions. They also store logs and generate
The MicroComm DXI system is able to monitor contact closure
type alarm, status, or signal points and to drive output and event
control points through voltage source, current sink, LED, and
relay outputs. Inputs may be supervised or non-supervised, with
each supervised input able to individually detect the status of two
distinct switches, as well as open and short circuit faults. Two
types of units are available for this purpose; discrete Input/Output
(DIO) and Switch Panel Driver (SPD) modules.
SAC computers are standard PC type machines running the QNX
operating system with MicroComm DXI operating software. They
are available in rack mount, desk top, and mini tower packages
with a variety of keyboards and monitors.
Communication between the DXI system and other integrated
systems is through the SAC computer.
DXI Exchange
A MicroComm DXI system includes from one (1) to twenty (20)
exchanges which are comprised of card cages, control cards,
input and output cards, and power supplies. The exchanges
interface SAC computers to the field devices and provide the
system switching and digital processing functions.
Minimum configuration of a single exchange is an I/O card cage,
one control card, a power supply, and one or more I/O cards. This
can be expanded to include ten fully populated card cages, which
may include redundant control cards and power supplies.
Each exchange can be configured to connect various combinations
of up to 50 master stations, 2,560 intercom stations, or 7,860
monitor and control points, depending on the cards installed.
For example, if half the installed cards are the intercom station
type, only enough card slots will be left available to insert cards to
interface 3,840 monitor and control points.
The DIO units are available in a card cage, rack mount, and
wall mount packages with various input and output options. The
SPD is offered in a wall mount configuration and is intended
primarily as a high density interface for control panel switches
and indicators.
Switches and indicators that are not assigned to call placement
and program functions, may also be programmed as system
input points and status indicators.
Intercom Master Stations
MicroComm DXI Intercom Master Stations (IMSs) receive calls
from, and place calls to, the intercom stations or other master
stations. Additionally, they incorporate monitoring and control
functions for alarm points, monitor points, and event control.
Intercom master stations are available in rack mount, panel mount
and desk top packages and are available with either a standard or
large size character LCD display. Custom master stations can be
provided in switch panel or graphic panel configurations.
The LCD displays are 4 line by 20 character full alphanumeric
type and feature operator selectable text in either English, French,
or Spanish.
Operator interface options include a choice of internal
microphone and loudspeaker, external gooseneck microphone,
telephone handsets, headsets with boom microphones, external
signaling devices, and foot switch type press-to-talk switches.
Annunciation and Control Panels
Annunciation and Control Panels (ACP’s) are available in the
same packages as the intercom master stations, however they
include no audio communication features. Their purpose is
to provide remote monitoring and control functions for alarm
points, monitor points, and event control.
Intercom Stations
Each MicroComm DXI intercom station provides a voice
communication link to one or more master stations and has the
ability to receive any one of multiple channels of audio program
material at multiple volume levels. They may include up to two
function switches and an LED indicator, these are used for placing
calls, controlling program selection, and indicating station
Each intercom station requires only a single shielded pair cable
for connection to the system. All the power supply, audio, switch,
and indicator signals are multiplexed onto that cable to reduce
installation costs.
Intercom faceplates are brushed heavy-duty 11 gauge stainless
steel, and fit standard 2 gang or 3 gang electrical masonry boxes.
Custom faceplates can also be manufactured to meet any site’s
specific requirements.
Call Operating Devices
Call Operating Devices (COD’s) are used to initiate system calls
at locations physically separated from the intercom stations or
instead of intercom stations. They can also be used to initiate,
acknowledge, cancel, or otherwise control any system action that
would respond to any other system switch input or command.
Standard call operating device formats include pushbutton, call
cord, and pull cord actuators mounted on single gang plates or
switches designed for through the wall mounting in very rugged
or secure areas.
System Networking
Several forms of networking and data communication are used to
link DXI system components.
SAC computer to card cage connections, called the Exchange Data
Network, are made using a LonWorks direct connect or free topology
network. Discrete I/O modules, master stations, annunciation
control panels, and switch panel drivers communicate with the
SAC computers and exchanges via a LonWorks free topology
Digital Audio Trunks between exchanges, or between exchanges
and remote receiver units, are via a CEPT multi-channel digital
audio trunk.
SAC computer data networks between redundant computers and
among exchanges are via Ethernet. A variety of media types are
supported including single UTP, 10BaseT, coaxial cable, and
optical fiber.
Host port network integration to other computer based systems,
such as door control, closed circuit television, etc., can be via a
variety of Ethernet, serial interfaces, or contact closure I/O.
System Integration
The MicroComm DXI can communicate with virtually any other
microprocessor based system through an appropriate port, or
ports, installed in a SAC computer. It is commonly integrated with
door control systems, touch screen or graphic control panels, CCTV
systems, perimeter detection systems, access control systems, etc.
The DXI system can output information on call placement, call
status, and call identity as well as alarm point status or any other
status indication. Signals are transmitted and received, so that one
system responds to control information from the other system, for
truly integrated facility control operations.
In addition to microprocessor based systems, the MicroComm
DXI can integrate with audio systems including public address,
two-way radio, telephone, audio monitoring, etc.
System Operation
The MicroComm DXI system incorporates a wide variety of
voice communication and audio functions. It also includes the
ability to monitor and control input and output points, perform
maintenance and diagnostic functions, and integrate both data
transfer and operation with other systems.
Voice Communication Functions
Dial up or direct select calling - Stations can be dialed using
the telephone keypad or through a direct select switch panel.
Push-to-talk or hands free operation- Voice communication
control can be either push-to-talk or voice operated hands free
with a manual push-to-talk override.
Multiple master operation - A DXI system can include as
many master stations as required. All master stations are able
to communicate with any other station in the system. Multiple
masters can share the same call request queue or can have unique
call request queues.
Non-blocking voice communication - The DXI’s multichannel back plane is designed so that at least one voice
communication channel is available for each master station
connected to the system. Therefore, there is never any possibility
of a voice communication channel not being available when it
is required.
Programmable call routing - Call requests from an intercom
station are software programmable to queue at any master
station(s) in the system. Routing can be through multiple
exchanges and is independent of where devices are physically
Call forward -When a control console is unmanned, the calls
that would normally be queued on that console’s master station
can be redirected to another master station. Both new calls and
calls already queued will be redirected.
Programmable call request priority levels - All stations
are assigned a priority. On the master station LCD display, call
requests from stations with a higher priority will be displayed first
regardless of when they were placed.
Single button call answer - For quick and easy system
operation, the highest priority call request at a master station can
be answered by pushing a single button.
Call announce tones - The DXI allows the user to enable or
disable the call announce tones which sound at the beginning
and end of a call.
Selective call answer - For maximum flexibility in operation,
the system also allows calls to be answered in any order.
Call acknowledge tone - The MicroComm DXI can be
configured to periodically sound a tone at each station which has
a call request queued.
Programmable master station priority levels - All master
stations are assigned a call priority. Higher level masters will
terminate conversations of lower priority masters to establish calls
to the same station. The lower priority master will receive a call
termination message. Master stations will receive a busy signal
when they call a device already connected to a master station of
equal or higher priority.
Recall last device - This function is used to recall the last device
to which the master station was communicating. It can be used
to reselect a device after a busy signal or to reestablish a call after
it has been terminated by a higher priority call.
Adjustable volume levels - Each station’s output volume can
be adjusted through software from a SAC computer, or from a
master station during a call. Each master station also has a
volume control
Call hold - A master station can place a call on hold, make other
calls, and later return to the call on hold.
Call transfer - While a call is in progress, it can be transferred
to another master station. The call is re-queued at the new master
Conference calls - It is possible to establish conference calls
between master stations. Conference calls that are repeated on a
regular basis can be predefined to automatically connect groups
of master stations.
Other Audio Functions
Paging - The DXI can be programmed to allow paging to userdefined groups of speakers, intercom stations, and/or master
stations. Paging announcements can be made from either master
stations or a dedicated microphone.
Audio monitoring - Master stations can listen in to small groups
of intercoms simultaneously, or any sized group of intercoms
sequentially. Audio monitoring operates as a background function
with its own sensitivity.
Audio level alarm detection - Operators can use this
supplementary tool to alert them to problem situations. Sensitivity
levels can be programmed to automatically adjust throughout a
clock cycle.
Video visitation - Full host port support for video visitation
systems is available with timing, messaging, CCTV interface,
recording, and inter-site communications.
Visitor intercom - Stand alone visiting booth intercoms include
dual visitor phone capability, on/off control, audio input, and
audio output.
Programmable signal tones - The DXI allows the user to
activate audio signal tones in a number of ways; manually from
a master station, in response to commands from other systems in
the facility, or on a timed basis under control of the system clock
Music distribution - The DXI can distribute up to 30 music
programs to all stations. Several sources may be distributed at
several different volume levels. Music distribution to individual
stations or groups of stations is enabled and disabled from a
master station. The desired program is selected at each station
and is automatically suspended during voice communication.
Independent station amplifiers - Each intercom and master
station on a DXI system is provided with its own amplifier for
communication, music distribution, and paging. Therefore,
regardless of how many stations are connected to a signal, the
output power to each device remains constant.
Telephone interfaces - The DXI system can interface to standard
DTMF telephones which can be used as administrative intercoms
or as basic intercom master stations. When the DXI’s trunk line
module is included in a system, master stations and telephones
can access the external telephone network.
Two-way radio interface - Two-way radio systems can be
interfaced to the DXI system to provide direct communication
between intercom master stations and the radio system. It is also
possible to setup cross patches between different radio systems to
retransmit messages received on one radio from the other.
Operational, Control, and Monitoring Functions
On-line programming - DXI’s multitasking operating system
features the ability to configure and reconfigure the system and
to run maintenance and diagnostic procedures while the system
is in operation. Therefore, modifications can be made in one area
without affecting the operation of the rest of the facility.
Password protection - Access to system functions can be
controlled through the use of the DXI’s system of multiple userdefined passwords.
Operator ID - DXI software allows an operator ID function to be
incorporated. This may be required for associating system activity
with shift personnel and also enables automatic call searching by
an ID number.
Fixed point alarm monitoring - The DXI can collect and
annunciate alarm points from a variety sources; tamper alarms,
door contacts, emergency push buttons, etc.
Output control - Output control point drivers are available with
voltage source, current sink, relay contact and LED interfaces.
Event response - The DXI system can be programmed to control
output point status according to the action of monitored points or
timed commands to perform event response functions.
Standard interfaces to other equipment - To help provide
correctional staff with the tools needed to remain in complete
control, the DXI is easily integrated with, and can be controlled
from, other security related systems such as door control, access
control, fire alarm, perimeter security, lighting control, and
CCTV switching systems. It can also interface with other audio
equipment such as paging systems, music sources, recording
equipment, two-way radio systems, radio pager systems, and
telephone systems.
On-line factory support and upgrades via modem - With a
modem interface to the DXI’s Service, Administration and Control
computers, diagnostic support is available from the factory for
system hardware and software. In addition new releases or
modifications can be uploaded
Maintenance and Reliability
The MicroComm DXI ensures years of trouble free operation
through high standards of workmanship, durable materials,
tamper resistant construction, and hardware and software features
designed to simplify installation and maintenance. These features
Rugged stations - The DXI intercom stations are vandal proof
in design and construction, and feature optional weather resistant
System logging - The MicroComm DXI maintains a continuous
log of all system activity on the SAC computer hard drive. This
log can be viewed on screen, and sections marked and printed
on demand. It can also be configured for continuous printing.
This provides valuable assistance when starting up a large
complex installation or diagnosing problems when the system is
in operation.
Separate operational and maintenance logs - Report filters
allow logs for system maintenance to be separated from those
for system activity. This eliminates the need to wade through
irrelevant information when looking for specific data.
Failure detection and protection - In order to ensure rapid
detection of system problems, the DXI features detection of open
and short circuit faults in station and switch wiring, wiring short
circuit protection, communication fault detection, and I/O card
failure indication. It also uses short circuit, overvoltage, and
polarity protection circuits to prevent these faults from damaging
the equipment.
On-line diagnostic testing - DXI software allows testing of
system components and networks without disrupting normal
operations. A self test feature allows maintenance personnel to
quickly determine whether or not a board is operating properly.
Hot swapping - In order to minimize disruption and downtime
in the event of a component failure, all I/O cards can be taken out
of service without removing power and affecting the operation of
the entire system.
Redundancy - In order to avoid failure of the entire system in the
event of failure of a single critical component, the DXI supports
redundant operation of those critical system components.
Document # DS-DXI-450--2.5 • Copyright © 1997 Harding Instrument Co. Ltd. • All Specifications subject to change without notice • Printed in Canada
Represented by:
7741 Wagner Road NW
Edmonton, AB T6E 5B1
Tel 780.462.7100
Fax 780.450.8396
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