| GOLD EAGLE BUSINESS SERVICES. |
An access control system is a method of controlling who can enter through which door and at what time. Access control can also be used for investigation of incidents, as the software keeps a record of ‘events??things that occur in the system (who used which door).
Most access control systems contain the following components:
A door controller.
A main or event server.
Software.
A door controller is a small local computer that collects information and reports this to the main server. If there is no power or a break in the communications line, the local door controller will continue to function and will store events until communications are restored. The knowledge of whom and when a card can enter the door the controller is linked to be also stored on-board.
The main controller collects all the data from all the doors and processes it.
The software loaded into a PC turns the data into an understandable format and allows the Administrator to program the functions of the system.
The information that is transmitted to the PC can be used in many ways. It can be stored for review; it can also be transmitted to another location. The local programming may also be carried out from another location.
The method sending the data to another location can be by telephone line, a dedicated telephone line or fibre optic line or by internet.
Larger companies like to monitor in a central location perhaps in Germany or America. The transmission is automatic or can be sent at wide band width times (night time), however, if the doors are being monitored in another location, then it is normally in real time (live). It is also possible to have the alarm function monitored locally, so that a local company can respond quickly, as an alarm suggests that there is something irregular happening. Perhaps it is a false alarm, but it could equally be someone breaking into the secure area or an unauthorised person trying to use their card at the wrong time or on a prohibited door.
Motion Detection.
Motion detection systems or intruder alarms are used in residential houses and offices. In residential houses they are first line of detection. Offices use the system to back up access control or stand alone intruder detection (same as residential).
The system comprises of small white boxes mounted near the ceiling and pointing towards a particular area (usually the centre of a room or a door). When the system is ‘armed?(switched on), the system detects anything passing through the area of vision sets of the alarm. The systems can be ‘pet immune??they ignore cats and small dogs. Be careful with the size of the animal, I know from experience that a large parrot set the system off (true) when it flies around.
There is a controller key pad set near the front door and anyone entering has about 30 seconds to disarm the system or to arm it when leaving. We also supply key fobs (remote control switches) that arm and disarm the system with a press of a button.
If there is an alarm any or all of the following can be activated: 1. a flashing light on the outside of the building (or corridor in an office), 2. a loud siren 3. an auto-dialler that calls three telephone numbers with a voice message or SMS message.
Some newer products have a built-in voice message. So if something breaks the beam the unit shouts ‘Whose there??in a human voice. It is also possible to record a dog barking also.
The detector sensors (white boxes) come in two types: 1. infra-red bean 2. infra-red beam and micro-wave sensor. The second is far more reliable and less likely to false alarm, as it takes two ‘detections?to make an alarm.
Other forms and particular specific area detection is also available:
Smoke detectors, heat detectors and CO detectors can be wired into the system giving an alarm audibly, visually or via the telephone autodial.
Window detection ?these detector give a vertical ‘curtain?detection, providing a detection area the width and depth of the window on the inside.
Glass Break Detector 
Break glass detectors
The glass break detectors work on the frequency of breaking glass. If a window is broken (even quietly) the armed system will detect the frequency and alarm.玻璃探测器通过玻
Perimeter protection.
Perimeter detection is performed by an infra-red beam (IR barrier) that is located on the top of a wall or fence. The system consists of a transmitter and a receiver, these two units are located up to 150 meters apart and a IR beam is transmitted by the transmitter and received by the receiver. If that beam is broken then an alarm sounds in the control room. CCTV PTZ cameras can be programmed to automatically swing to the location of the break in the beam. This system can be installed in front of windows on the ground floor (usually ground floor, but could be to other floors as well).
|
|
| GOLD EAGLE BUSINESS SERVICES. | |
Suite 503, Tower B, China Life International Building, Wang Jing, Chao Yang, Beijing 100102, PRC