# Modern data centers appletec in Russia
We use our own data centers as well as data centers of strategic partners to host server and network equipment.
Of the main, we can distinguish the following data centers:
- DC Salaryevo
- DC Rostelecom М9 - М10
- DC Hetzner
- DC DataDock
Technical information about data centers appletec
The equipment of the data centers is supplied with power supply of the first category of reliability, thanks to the use of 3-beam automatic transfer switches, as well as connection to 2 independent supply centers of power supply, via cable lines (CL) - 10 kW with the allowed power consumption of 5500 MW.
The network infrastructure simultaneously uses several communication channels from such providers as Rostelecom, Beeline, Megafon, TransTeleCom and allows to provide uninterrupted network connection of server equipment.
Security is provided by an alarm system that includes more than one hundred network devices and more than fifty access control terminals. Entrances to the building, as well as all rooms with critical equipment, are provided with access terminals using proxy cards of the HID standard. The remote control system for all engineering safety systems of the facility operates around the clock.
The cold supply system to maintain the temperature and humidity conditions (TVR) in the halls is produced by the Central air conditioners with a cooling capacity of 7.5 MW, operating under a ring redundancy scheme, the remaining loads are removed by the cabinet air conditioners. The automated control of TVR is conducted around the clock, both at the hall level as a whole and at the level of individual customer racks.
Fire extinguishing system
All rooms are equipped with automatic fire alarm systems, an evacuation warning and warning system, a smoke protection ventilation system, and fire-fighting water supply, as well as two gas fire extinguishing systems.