SYSTEM INFO - Neumann Elektronik

Communications Systems for Intercom, PA,
Emergency Call and Telecommunications
MDK - Multifunctional Digital Communications System
SYSTEM INFO
ms NEUMANN ELEKTRONIK GmbH
Efficient Solutions for Information and Safety

MDK –
Multifunctional Digital Communications System
The Multifunctional Digital Com-
munications System is a centrally
controlled voice communications
system that has been designed to
fulfil all audio applications. The
MDK serves as the central exchange
for intercom, public address (PA),
emergency call and telecommuni-
cations functions. The MDK can be
used for all such applications in in-
dustry and public transport, inclu-
ding those that require the highest
reliability and safety standards.
Complex Applications
The modularly designed communi-
cations system is ideally suited for
complex applications in the Rail-
ways/Public Transport sector, as
well as in the Industrial sector. In
Railways/Public Transport systems,
the MDK System finds use as a dis-
patcher system for communications
along railway lines, and as a voice
communications system in 3S con-
trol centres. In Industry, it is used to
implement very extensive PA/inter-
com applications.
Emergency Call /
Info Systems
In addition to expecting higher
safety standards in public trans-
port systems, customers are also
asking for more comprehensive
information. ms Neumann provides
extensive emergency call and information
systems that can be implemented
based entirely on MDK
Systems.
Safety in tunnels has become a particularly
important issue in recent
times. Special design emergency
call systems, where the call boxes
also contain monitored fire extinguishers,
can be monitored and
controlled with the MDK System.
Emergency Warning
System
The MDK can be modularly configured
as a plant warning system
or emergency warning system that
complies with the DIN EN 60849/
VDE 0828, Part 1 standard.
Innovative
Communications
Exchange Structure
Further features of this system are
its exchange capabilities for intercom
and public address (PA) connections.
Both analogue and digital
devices can be connected to the
MDK. The system also offers plugin
modules to connect all analogue
telephone equipment and existing
multiparty lines to the MDK. In addition,
radio system interfaces enable
it to integrate the most common
radio and wireless systems
– regardless of whether analogue
or digital. Its standard digital interfaces
(per DSS1) enable all digital
telecommunication terminal devices
to be connected to the MDK,
as well as digital PABX systems.
All intercom call stations already installed
in existing intercom systems
from ms Neumann Elektronik are
fully compatible to the new analogue
intercom call stations and can
thus be connected to the MDK.
Excellent Speech
Intelligibility
Good intercom and PA speech intelligibility
is guaranteed by the
system’s increased bandwidth of 7
kHz.
Modular, Versatile and
Innovative
The modular design of the system
ensures its exceptional versatility.
This modular design also enables
the system to always be able to
take advantage of new, innovative
developments in wired communications
technology.

The Multifunctional Digital
Communications System (MDK)
The basic configuration of the
MDK System consists of a base unit
(exchange) that can simultaneous-
ly switch various connections to
intercom/PA devices and to tele-
phone lines. Several of these base
units located at different sites can
also be interconnected via digital
interfaces (S2M). The terminal de-
vices of every base unit can then
be accessed from any other unit
connected to the system. Digital
interconnections via S0 and S2M in-
terfaces enable telephone connec-
tions to be made to PABX systems
from every MDK base unit. Networ-
king can be implemented either via
fibre optic or copper cables (see di-
agram under “Network Structure”
later in this document). To further
ensure reliable transmission paths,
the base units are interconnected
in a ring network topology.
Highest Reliability
ms Neumann Elektronik offers
communications systems that have
been specially tailored to meet our
customer’s requirements for reli-
ability. On request, we can provi-
de configurations into which two
exchange control units have been
integrated to implement a redun-
dant processor system.

System Architecture

Structure of the MDK System Base Unit
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Modular design using plug-in modules
Two different bus systems: VME bus and MDK bus
VME bus as the control bus for the base unit (Versa Module Eurocard)
· Exceptionally versatile
· High reliability standards
· Very good EMC
· Low energy consumption due to active termination
· Fast access times
MDK bus for data transport between the digital
coupling matrix and the terminal device line connection modules
within the locally installed system
Up to three bus systems: Master, Slave 1 and Slave 2
Data transported on 16 highways with 32 channels each (PCM 32)
3 system plug-in module levels Master, Slave 1 and Slave 2
Smallest configuration is one Master module with up to
8 line connection modules
Up to 32 line connection modules in the entire line connection section
Up to 7 S2M interfaces can be used as needed
One digital audio storage module can be installed

Network Structure
MF Concentrator for multiple telephone/intercom lines
MZV Microprocessor-Controlled Central Exchange System
EZV Electronic Central Exchange System
MDK Multifunctional Digital Communications System
ZZ System interconnection interface
TA-ZZ Terminal adapter for system interconnections

MDK Terminal Units

Technical Highlights at a Glance
Multifunctional desktop call station
MTSD (digital)
PC call station with touch screen
Emergency call system in tunnels
Emergency call and information call system
Process oriented communication
Control of alarm events and sequence of responses
Telephone announcements transmitted to loudspeaker circuits
Automated announcements
Telecommunications, intercom, PA and control functions
united in one exchange system
Up to 128 intercom/PA devices connected to one exchange
without blocking each other
Up to 256 telephone lines connected to one exchange without
blocking each other
Up to 10 MDK Exchanges can be interconnected via routing
Virtually unrestricted access to other telephone systems via
connection to external PABX systems
Management System application for supervisory control
ntegrates many different interfaces: S2M, So, U, RS232, RS422, a/b, lines, etc.
Long service life due to low heat technology
High transmission bandwidth for intercom and PA
GSM, DECT/ ISDN implementation
Connection to fire alarm systems
Remote diagnosis/maintenance, remote configuration using
PC user interface software
Terminal devices of all generations from analogue to digital can be connected
Several MDKs can be networked together via the S2M interfaces
Gateway for H.232 protocol
Very good EMC due to low processor clock speed

The Most Important Functions
Intercom and PA Technology
Flashing indicator signals incoming call at call station
Constantly lit indicator signals line engaged at call station
Indicator flashes at four different frequencies to indicate
status of various functions
256 assignable priority levels for call override
A call station assigned a higher priority can override and interrupt an
active intercom connection from a lower priority station. The higher
priority station is then switched immediately through to the destination.
An active connection can be reserved for a configurable length of time
(operator station function). At the control centre, all operator stations have
equal priority, and these call stations can communicate with each other. An
active intercom connection at one of these stations can be reserved to
remain connected for the reserved length of time so that no other call
station can interrupt the conversation.
Collective calls (all stations called), and predefined group calls
Call stations can be added to a group call by pressing a button
Call on hold functions
• Active call can be put on hold by single incoming call
• Active call can be put on hold by call waiting
• Active call can be put on hold during group call by group call participants
• Active call can be put on hold by call line (only signalling function)
Call waiting
Time scheduled volume lowering, e.g. for announcements (nighttime low
volume setting)
Time scheduled cyclic audio output from the digital audio storage module
Service connections between control centre and service personnel
Talk direction of intercom connections on hold can be controlled from
one end
Entrance (door/gate) intercom function
Paging loudspeaker function
Talk direction of intercom connection can be controlled from one end
Different text messages can be output to the displays of digital call stations
for different events and functions
Functions to ensure reliable PA announcement transmission
• Functional monitoring of amplifiers with automatic switchover to
backup amplifier
• Loudspeaker connections monitored by measurement of loudspeaker
circuit impedance
• Automatic gain control of amplifier as a function of ambient noise levels

Emergency Call Functions
Any incoming call can be defined as an “emergency call” based on the
destination telephone number
Emergency call signalling with a special display of the pillar designation
from which the call originated (e.g. location) based on the source
telephone number
Fault signalling generated by cyclic functional monitoring
Every emergency call is signalled, even when the operator station or audio
frequency channel is engaged, because the operator stations can be set up
to be reachable at all times
Every emergency call can be accepted either in chronological order or
any order
Every emergency call can be forwarded (manually or automatically) to any
other ISDN terminal devices
Emergency calls coming in at the same time can be accepted and put
on hold
Operators can also call back to emergency call pillars
Video connections can be controlled (manually or via the Management
System application)
Calls can be automatically forwarded to a backup operator station when an
operator station fails
A redundant telephone to answer emergency calls can be set up using eit
her a standard ISDN telephone, or
Using a Neumann MDK System Telephone connected to its own So interface
Recording of call conversations to external recording devices can be
activated automatically
Call and connection data can be logged (with telephone number and
time stamp)
Telephone Functions
Digital telephone service features and functions as per DSS1
Functions and technical features of analogue telephones and
terminal devices as per 1 TR2

System Features
Nominal operating voltage:
• 48 V (+12 %, -10 %), or
• 60 V.. (+12 %, -10 %)
Climate class: 3K4 as per DIN IEC 721, Part 3-3
Type of modulation: PCM in time multiplexed technique as per CCITT
CODEC: A-Law as per CCITT recommendation G711
Internal digital transmission format: PCM32
Digital telecommunications interfaces as per ISDN standard (So, U; S2M), ISDN protocols per: 1TR6 and DSS1
BZT general certification: Cert. No.: A122083H for 1TR6
Voice transmission bandwidth for telecommunications: standard ISDN
Voice transmission bandwidth for intercom/PA: approx. 7 kHz
Maximum of 256 telephones or 128 intercom/PA devices connectable to one base unit without blocking each other.
The number of devices can be freely mixed between the two technologies (analogue and digital).
Maximum of 10 base units can be interconnected in a ring topology.
Maximum number of addressable telephones lines: 2,560; Max. number of intercom/PA devices: 1,280
Maximum intercom/PA line connection time on a fully loaded system: 200 ms
Maximum of 7 S2M interfaces per base unit
Digital audio storage in EPROM and/or RAM; voice signal from call station is stored directly into memory
Logged events are time stamped using either:
• the time from a built-in radio synchronised clock, or
• the system time synchronised by an external clock (synchronisation messages from the network,
or synchronisation by clock pulses (minute intervals))
Long-term and short-term logging systems can be connected to the MDK
System controllable from a supervisory computer (Management System) via RS232C (serial) interface
Siedle call stations can be connected
Microphone/earphone headsets can be connected
Analogue and digital radiotelephone systems can be connected
PC call stations with touch screen can be connected for intercom, PA and telephony functions
Service interface for system diagnosis integrated into every base unit can be read out by a PC via a monitor
program implemented in firmware or via a program with graphical user interface running on Windows 95…XP
Plug-in line connection modules can be hot swapped on a running system. No reset required because the modules
are self initialising.
The MDK is freely configurable using a PC program with graphical user interface
Configuration data transferable using a standard PC card (memory card), or via a network interface
Supports remote diagnosis and remote configuration
MDK utilises two user access tables that can be time scheduled to be activated at different times.

Applications
Railways
Public Transport
Energy, Public Utility, and Waste Disposal Industries
Waterways and Inland Shipping Routes
Heavy Industry
Chemical Industry
Oil & Gas
Motorways
Tunnels