Agenturer: Radica (Davicom)
Radica Broadcast Systems offers the Davicom MAC transmitter Monitoring, Alarm and control system:
Overview
The Davicom Monitoring, Alarm and remote Control (MAC) system is a powerful and versatile tool for remote supervision and automatic reporting of conditions at, for instance, broadcast transmission sites, or unattended studios.
The MAC unit watches over critical site equipment such as transmitters, antennae, power sources, tower lights etc., and will act either automatically, or through the hands of a operator communicating via the remote software interface. The action might be to switch to back-up resources, re-route signals, or re-set trips.
Benefits of the MAC system include:
- operational down-time can be reduced
- maintenance time and costs may be reduced
- call-outs can be handled more efficiently
- small variations and drifts can be monitored and dealt with before they lead to faults
- fault events are accurately logged automatically
- equipment can be reset and signal paths re-configured without a visit to site
- increased site security
The MAC may communicate (dependent on version) via a standard telephone circuit, GSM mobile system, satellite phone, or by IP network (internet/intranet) - so can be located and contacted anywhere in the world within reach of a these systems. The alarm messages are sent by voice phone, fax, pager, computer, or as SMS text messages (to GSM mobile phones). The unit can be accessed locally by a terminal, or remotely either by phone (using touch-tone commands) or via the computer graphical interface, MacComm (which operates under Windows 95®, 98®, 2000®, ME®, or NT®). All actions are recorded in the History Log, which stores 512 events.
MacComm display
click to see a larger image of the MacComm opening screen
MAC System
The MAC System accepts inputs from metering (analogue) and status (digital) sources which integrate with the unit's programmable logic, as well as audio sources for remote listening. Outputs, for controlling external equipment and events under the control of the logic, are presented as physical relays or open collectors. There are also RS-232 serial communication ports for routable connections to external equipment.
Two types of alarm reporting may be set: minor and major, each with upper and lower thresholds, and each with different sets of telephone numbers to notify. Each input can be programmed with a "delay before action", and a "delay before return to normal", to prevent false triggering.
"Virtual" inputs and relays may be programmed-in to establish conditional actions. As a simple example of a logical instruction: IF TRANSMITTER fails, send a "Transmitter fail" major alarm, but IF TRANSMITTER AND POWER SOURCE both fail, only send a "Power fail" alarm. In this way the system will present the clearest picture of what is happening, and act appropriately and "intelligently".
The MiniMAC has a compact non-expandable 1U chassis. The larger MAC units have plug-in I/O cards, which permit easy expansion of the system. The 2U chassis size (MAC8/MAC16, illustrated above) accommodates up to 2 cards, but may be expanded to MAC32 with an expansion chassis as well. The standard 4U chassis takes up to 4 cards
Fullstendig informasjon finnes også på Radica sine websider: Radica Broadcast Systems