The 4000 Digital Series is a Digital Communications System using a central switching matrix for routing
calls between outstations connected in a star format.
The digital central switching matrix uses a microprocessor for control and configuration purposes. A
Digital Matrix Card, allowing multiple routes to be made simultaneously achieves all switching and
routing. Analogue audio, GPI inputs and outputs, data interfaces and an advanced software package are
also provided as part the 4000 system.
A range of Digital Control Panels are available providing a suitable user interface for making and
receiving calls over the system. These panels contain push buttons configured to operate specific routes
or activate control functions. The push button actions are sent as digital data using a serial link to the
central matrix for interpretation by the microprocessor and information is returned to the control panel by
the same method. Audio is sent and received digitally, multiplexed with the data via a single co-axial
cable. Audio and data can also be connected via standard twisted pair wiring or CAT5.
The standard control panels provide the basic facilities of Direct Access Keys (DAKs) which allow singlebutton operation for frequent calls, a Reply key for responding to unscheduled calls and where
applicable, a dial display for making infrequent calls.
A call is initiated on a control panel by pressing one of the assigned DAKs or, on panels equipped with
an electronic dial-pad, by dialling a number and pressing the call button. This activates crosspoints,
located in the Matrix, which make the audio route (or routes) to the desired destination(s). Routing can
be one-way (e.g. talk only) or two-way (talk and listen simultaneously) and several callers can speak to
the same destination at the same time due to the mixing capability of the matrix.
The crosspoints in the matrix are activated or de-activated according to configuration rules held in the
system's Matrix map (stored in the microprocessor's memory). The system map for the 4000 Digital
Series residing on a Personal Computer is downloaded into the Matrix from the 'Configuration and
Master Assignment Programming System integrated' (CMAPSi) and controls every aspect of 4000
Digital Series operation. The Matrix sends part of the system map out to each control panel,
programming the actions available on each DAK of each panel. This includes any special function that
may also be assigned to a particular pushbutton in addition to initiating the normal dual routing.
Each DAK may be centrally configured and assigned to a destination, source or both at system set-up.
On some panels, DAKs that are not assigned at system set-up can be assigned, by local programming
of the pushbuttons in Soft mode, to allow different routing options. Local assignments may not be
retained if the system is reset, although they are held in non-volatile memory at the panel and thus will
be retained after power down.
Destinations and sources can be other panels, beltpacks, 2-wire or 4-wire circuits, either individually or
in groups. The destinations and sources could also be in another talkback system. Connection to other
Technical Manual Issue 2.1 4000 Digital Series II
Page 2 STA0381
4000 Digital Series systems can also be achieved by use of Ethernet, providing an integrated private
intercom network. Up to eight 4000 Digital Series systems can be connected using this facility.
A Conference facility is also available, configured via CMAPSi, which allows people to converse in a
conference mode. This is similar in operation to the Conference Ring (Party Line) facilities available in
older conventional systems. Users can be allowed access to any conference (up to 64 conferences are
allowed) either to listen only or to talk and listen
9RU - 4920: 482mm (19 inches) wide
400mm (9RU) high
500mm (20 inches) deep
4U - 4420: 482mm (19 inches) wide
168mm (4RU) high
485mm (19.5 inches) deep
Weight: 20 to 25kg
Power Requirements: 90V to 250V, 50/60Hz, 300W max
Frequency Response: 30Hz - 17kHz ±3dB
Crosstalk (adjacent channel) <-60dBu
Nominal Level 0dBu
Matrix headroom +16dBu
Distortion < 0.1% @ +16dBu, 300Hz - 10kHz;
< 0.5% @ +16dBu, 100Hz - 10kHz
Off Noise <-80dBu, 20Hz - 22kHz, typically
On Noise <-62dBu, 20Hz - 22kHz, typically
Analogue Inputs: 25 way D-type
Balanced, line level,
Input Impedance 10kΩ
Input Balance <-60dBu
Input Level (max) Input gain set @ -
Analogue Outputs: 25 way D-Type,
Balanced, line level,
Output Impedance 120Ω
Output Balance <-30dBu
GPI Inputs: 37 way D-type, Opto-isolated
GPI Outputs: 37 way D-type,
Isolated relay Open collector driver
Control Inputs/Outputs: 25 way D-type RS232,
9 way D-type RS422,
Thinnet / AUI Ethernet®
AC power Inputs/Outputs
4920: 2x IEC AC input,
9 way D-type Alarm o/p
4420: 2x IEC AC input
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|Last activity||April 8, 2020|