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The physical layer is the foundation of the information security, so the devices' physical security has a priority over within the company's technical policy. Physical security should be comprehensive and include several components:
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- High-rise part: the location of wireless devices, for example, the roof of a building, a mast, a telecommunication tower.
- Cable route: cables connecting the high-rise part and the equipment located indoor.
- Building: equipment located indoor and points of connection to the infrastructure. Infrastructure The infrastructure may include data channels, power, climate systems, etc. Equipment The equipment should be placed in a rack or in a telecommunication enclosure, which can be placed in a dedicated room or can be combined with the high-rise part of the object.
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Figure 2 - Communication node block diagram |
Site selection for the equipment installation
The site for the equipment placement installation must meet the requirements of the company's technical policy and make possible the future communication node development. Following allow future network scalability. The following aspects should be taken into account while when choosing a site:
- Access to the facility is an important factor affecting the communication recovery time and the equipment maintenance time. Access to the facility should be limited in time and for white lists of employees. Access lists must be up to date. If access lists are not up to date, it can be used, for example, by a dismissed employee whose name was not promptly excluded from the lists. Pay attention on the guards and locks in the places where equipment is located in order to prevent unauthorized access.
- A dedicated room availability. It is recommended to place data transmission equipment and points of connection to the infrastructure in a dedicated room, closed isolated from external factors. For example, it can be a room with a separate entrance and access for the company employees only or a machine room where the third-party companies company equipment is located.
- Cable route. The site must meet the requirements for the cable route installaion installation and for access during the operation operational phase. General requirements adherence for cabling is an important factor in reducing the risks associated with links link accessibility, which can be caused by cable damage or connection errors.
- Power. The site must have connection point to a stable power supply network. In accordance with the company technical policy, a backup line of electric power supply or an uninterrupted power supply system can be organized. Power supplies must be independent, i.e. there should be no single point of failure. For backup power supply systems, it is recommended to implement automatic switching schemes between sources, which will avoid communication interruption in case of the main power supply source failure.
- Grounding. Proper grounding can significantly reduce the likelihood of wireless devices failing in the case of electromagnetic noises or lightning strikes.
- Climate systems. Reliable network equipment operation depends on external conditions: the device is guaranteed to function in the specified temperature range, pressure and humidity. The environment influence is random, therefore, in order to maintain stable operation, the specified climatic conditions must be created artificially, it is recommended to install an air conditioner and a heater with the possibility of their automatic on / off. The climate systems in the high-rise part are impossible, therefore, for reliable operation in harsh conditions, devices of the InfiLINK 2x2 / InfiMAN 2x2 families with an extended temperature range can be used. Such devices are equipped with a built-in heater, which turns on when the ambient temperature drops below a set threshold.
- Links. A network accessibility can be increased due to the backup links installation. Links must be independent, i.e. do not have single points of failure, for example, a wired communication channel can be the main one, and wireless can be the backup one. Realization of fault-tolerant schemes for automatic links redundancy and aggregation using Infinet devices are described in the Link aggregation, balancing and redundancy article. Scenarios with the mobile objects require a different reservation scheme, describer in the Connectivity with mobile objects article.
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