The advantage of using this wireless communication channel is a continuous coating. The main methods of transmitting information to the network in question include GPRS, SMS and voice channel.
Installation of a full security system may be unnecessarily expensive for the task. In such situations, the best solution is to install a stand-alone controller for each of the points of passage, which must be equipped with access to the Network Switch Management Software.
Autonomous systems
Autonomous systems are cheaper, easier to use, do not need to lay hundreds of feet of cable or the use of devices for interfacing with a computer, they are computers themselves.
In doing so, the disadvantages of such systems include the inability to create reports, keep records of working time, transmit and compile information about events controlled remotely.
When choosing an autonomous system with high security requirements, it is recommended to pay attention to the following: The reader should be separated from the controller which might lead to opening of the lock from the outside. The controller must have a backup power supply in case of power outage. The reader must preferably use a vandal resistant casing.
As part of a standalone access control, electronic locks that communicate wirelessly are also used: the door lock mechanism is installed with an electronically controlled and integrated reader linked to the Network Switch Management Software.
Additional Features
GSM module, which allows you to send SMS with information about the passage (used, for example, in schools). Network access control can be managed remotely via the Internet (for example, access control management from the central office, if the company has many branches). Complex for plastic card personalization (printer for plastic card owner information, including photographs).
No pass back mode – if a person has already passed to the protected area, the resubmission of its access card to the input will be prohibited (as the card will not be shown on the output), which eliminates the possibility of the passage of two or more people using one card.
The cellular concept comes from first generation networks commissioned in early 1980. Each coverage area was a circle of 30 to 50 km radius with the center of each circle, a base station and a base station. These circles are assembled regardless of roaming problems. Each user in the coverage area has a static frequency band allocated to the phone. Thus, each station could provide as many channels of communication frequency bands available.
This system was unreliable and replaced by another system to allocate a frequency band only if the user was required to also increase the number of subscribers to a certain point, in the event where all subscribers do not phone simultaneously.
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