Transmission device (hazard detection technology)

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Placement of a transmission device with an alternative route in an alarm transmission system.
Open hazard alarm center. The square circuit board on the top right is a transmission device for remote alarming via a wired IP network and ISDN. The circuit board in the small housing at the top left is a GSM module for remote alarming via mobile radio.

A transmission device , also known as a transmission unit (outdated terms: transmission device , dialing device), is used to set off a remote alarm in hazard alarm systems such as intrusion alarm systems , hold-up alarm systems and fire alarm systems .

functionality

If a remote alarm is to be sent, the hazard alarm center controls the transmission device via its alarm input or alarm inputs. Several alarm receivers can be stored, depending on the transmission path, IP addresses or phone numbers that are contacted one after the other for alarming. If the connection is successfully established, the transmission facility sends messages to the connection destination corresponding to the alarm type. After the messages have been sent, the transmission facility expects the message to be acknowledged. Depending on the configuration, the transmission device tries to reach the alarm receivers one after the other until it receives the first acknowledgment or it informs all programmed destinations. These methods can also be combined to alert an emergency call and service control center and B. to send an SMS to the owner of the alarm system.

migration

As part of the migration of the existing landline and mobile network structures from a circuit-switched to a packet-switched technology, many existing transmission devices that are not used for pure voice transmission must be replaced with IP-capable transmission devices, as the protocols used can be safely transmitted using the new transmission technology is not guaranteed. Furthermore, many of the security mechanisms required in the guidelines (sabotage activation, blocking activation, line monitoring) can no longer be meaningfully activated by the upstream IAD . The circuit-switched CSD service in mobile communications is no longer up-to-date due to the low data transfer rate , high connection costs and the lack of flat-rate billing and has also already been discontinued by some mobile communications providers. It is therefore usually necessary to switch to IP transmission via GPRS , UMTS or LTE for remote alarming via mobile radio .

Transmission routes

A transmission path is the connection between the transmission device and the alarm receiver and transports the messages. The messages can be transmitted to the alarm receiver via various networks:

  • Wired IP networks ( data transmission , e-mail).
  • Radio-based IP networks (IP via GPRS / UMTS / LTE)
  • Mobile radio (other transmission methods via GPRS / UMTS / LTE, voice, SMS, CSD).
  • Fixed network ( POTS or ISDN connection, transmission of voice messages, SMS in the fixed network or as data transmission).

The audio frequency transmission system (TUS) is also used for fire alarm systems.

In the case of intrusion alarm systems that are set up in accordance with the VdS directive, remote alarms are only issued by means of data transmission via IP connections.

Transmission paths are monitored by the transmission device permanently or at regular intervals for functionality. If the transmission path is not available due to a disturbance or manipulation (e.g. " sabotage " in intrusion alarm systems), the substitute transmission path (additional use of an additional network for remote alarming) may be used automatically.

history

In the past, the terms AWUG and AWAG were common for transmission facilities . These terms are only rarely used or for old devices.

  • AWUG : A utomatisches W ähl- and Ü TRANSMISSION SYSTEM g et up instrument
An AWUG was used to transfer information (e.g. messages from the hazard alarm system or building technology) via the public telephone network (POTS or ISDN) to suitable remote stations (e.g. security services, fire brigade, police) with the help of special protocols (e.g. X.75 , Telim, VdS 2465, Contact ID ).
  • Dialer : A utomatisches W ähl- and A nsage g et up instrument
An AWAG dialed a telephone connection in the landline or mobile network and played back pre-recorded acoustic voice messages.

Individual evidence

  1. ↑ DIN VDE 0833-1 Hazard alarm systems for fire, burglary and hold-up, part 1: General specifications, October 2014, p. 13
  2. ↑ a b VdS guideline 2463 - transmission devices for hazard messages (ÜE), p. 5
  3. ↑ VdS guideline 2471 - Transmission paths in alarm transmission systems, p. 4
  4. ↑ a b VdS guideline 2311 - intruder alarm systems, planning and installation, section 6.5.3
  5. ^ Klaus Rehborn: Practice of alarm systems. 2nd edition, Elektra, Munich 1991, p. 160

literature

  • DIN VDE 0833-1 to -4: Alarm systems for fire, burglary and hold-up
  • VdS 2463: VdS guidelines for hazard alarm systems - transmission devices for hazard alarms 2007-08
  • VdS 2311: VdS guidelines for burglar alarm systems - planning and installation 2017-04