One of the most important factors of the industrial communication system creation is the data (voice) transmission method: unicast, broadcast and multicast (sometimes they are combined). The routing method plays an important role in the value formation and has an impact on the communication system reliability in general.
Let us consider the specifics of different types of routing in industrial IP-network.
ARMTEL - EXPERT IN INDUSTRIAL COMMUNICATIONS
Armtel designs and develops the most advanced industrial communications systems that combine IP based and ISDN technologies for various industries. Armtel has developed, manufactured and has been supporting generations of intercom and PA/GA systems deployed worldwide. We want to share the expertise and form a place for discussion and development of industrial communications in accordance with tomorrow's requirements.
January 28, 2015
Multicast and Broadcast in Industrial IP Communication Systems
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6:14 AM
Multicast and Broadcast in Industrial IP Communication Systems
2015-01-28T06:14:00-08:00
Armtel
broadcast|communication systems|distributed communication system|industrial ip|ip communication system|ip routing|multicast|
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broadcast,
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distributed communication system,
industrial ip,
ip communication system,
ip routing,
multicast
October 15, 2014
Centralized vs Distributed Industrial Communications
To assess the role of distributed systems in modern industrial telecom, first of all, it is necessary to start out from the key requirements imposed to these systems in general.
The first one is a high level of reliability of the system. It means that its service life shall be decades. In this case, the system can be in the standby mode (preset readiness) if there are no emergency or out-of-schedule circumstances. But, in case of the emergency situation, the system shall be immediately activated. The reliability of industrial communication system guarantees that it will help saving human lives at the proper moment.
The second requirement is the speed of the system response – the possibility of the call initiator to contact immediately one or a group of subscribers. The connection time is the most vital in case of emergency situations when every second counts.
The first one is a high level of reliability of the system. It means that its service life shall be decades. In this case, the system can be in the standby mode (preset readiness) if there are no emergency or out-of-schedule circumstances. But, in case of the emergency situation, the system shall be immediately activated. The reliability of industrial communication system guarantees that it will help saving human lives at the proper moment.
The second requirement is the speed of the system response – the possibility of the call initiator to contact immediately one or a group of subscribers. The connection time is the most vital in case of emergency situations when every second counts.
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4:47 AM
Centralized vs Distributed Industrial Communications
2014-10-15T04:47:00-07:00
Armtel
centralized communication system|communication systems|distributed communication system|emergency communication system|industrial communication|redundancy|
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centralized communication system,
communication systems,
distributed communication system,
emergency communication system,
industrial communication,
redundancy
June 11, 2014
Simplex Calls Control in Industrial Communication Systems
The case history started in the 1940s of the last century when the European and American PA/GA and intercom paradigms originated. At the time, industrial intercom and control communication became duplex and simplex. Military application and high requirements to speech illegibility led to the creation of standards for communication in high ambient noise environment. At half-duplex (variation of duplex connection) connection, the built-in echo suppression system automatically controls the direction of the voice transmitting; in this case, communication delays happen as well as loss of speech and parts of important information. These peculiarities caused the development of simplex communication systems and technologies of simplex calls management correspondingly.
March 24, 2014
Speech Intelligibility In Industrial Communication
In accordance with the international standards, the speech intelligibility means "the degree to which speech can be understood by the recipient".
As the speech signal has some redundancy, some loss of information during transmitting is considered acceptable to provide the sufficient intelligibility. However, the allowed value of the transmitted signal loss depends significantly on ambient conditions. Because of different noise, distortions and reverberation interference, the total loss of information may be so considerable that it may lead to the impossibility of speech understanding, in other words, to decreasing of speech intelligibility level. Thus, the communication systems which provide the sufficient speech intelligibility in normal conditions may be inapplicable in case of the high-level ambient noise.
In fact, the human voice contains a wider frequency spectrum.
As the speech signal has some redundancy, some loss of information during transmitting is considered acceptable to provide the sufficient intelligibility. However, the allowed value of the transmitted signal loss depends significantly on ambient conditions. Because of different noise, distortions and reverberation interference, the total loss of information may be so considerable that it may lead to the impossibility of speech understanding, in other words, to decreasing of speech intelligibility level. Thus, the communication systems which provide the sufficient speech intelligibility in normal conditions may be inapplicable in case of the high-level ambient noise.
Overtones
It is commonly believed that the band of the main speech signal energy is quite narrow: about 500 Hz - 2 kHz. That is why the standard telephony systems are intended for the full operating frequency band within 300 Hz – 3,5 kHz. This band is considered sufficient for voice transmitting under normal conditions.In fact, the human voice contains a wider frequency spectrum.
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11:49 PM
Speech Intelligibility In Industrial Communication
2014-03-24T23:49:00-07:00
Armtel
communication systems|industrial communication|speech intelligibility|voice communication|
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communication systems,
industrial communication,
speech intelligibility,
voice communication
February 26, 2014
Simplex In Industrial Intercom Systems. Part 2
Advantages Of Simplex Communication At Industrial Sites
At the current time the simplex type of connection provides maximum ease of use, quality and functional capabilities of industrial intercom systems. It’s due to a number of the simplex mode and the industrial enterprises specifics.
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2:16 AM
Simplex In Industrial Intercom Systems. Part 2
2014-02-26T02:16:00-08:00
Armtel
communication systems|duplex intercom|industrial communications|semiduplex intercom|simplex intercom|
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Labels:
communication systems,
duplex intercom,
industrial communications,
semiduplex intercom,
simplex intercom
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