AC power supply (UPS), single-system capacity is much larger than the DC system. 

 UPS system capacity over 1200KVA, (3 +1) power supply system stand-alone capacity of 400KVA, the application of non-communication environment, the (1 +1) power supply system unit capacity of greater than 600KVA. The large UPS systems bear the responsibility of security of electricity supply, in the event of system power failure, its impact was very large, even larger than the impact of regional radio and TV blackouts. It also decentralized power supply and the DC system advocated in the past, is contrary, as the saying said: Eggs should not be placed in a basket. If the UPS system capacity set reasonable devices, wire selection difficulty, the difficulty of construction, its contingency plans for the formulation and implementation of strong and related resources will also be put to good use. UPS system capacity, how much is appropriate and worthy of further study and discussion. 

 The importance of the local environment, air conditioning, electricity accounted for 50% -60%, and a dedicated air conditioning electricity consumption level from Class B to Class A approximation. 

 Dedicated air conditioning system shut down, due to the sharp increase of the power consumption of large IDC room, forcing the engine room temperature protection requires tighter, dedicated servers, routers, Temperature characteristics, greater than 30 minutes will make the room temperature rose sharply, and will result in the communications equipment damage, paralysis of the communication system, strict temperature control requirements will not permit a dedicated air-conditioning electricity for a longer time interrupt response time forcing the self-powered, to enhance the carrying capacity. The reality of the communication hub building, communication game point of its own generating units generating the response time of 5-10 minutes is good, but to be able to carry communications equipment and air conditioning equipment electricity. Since the power switch operating in the power outage is a very simple thing, can not tolerate the slightest mistake. 

 The above changes necessary to fully understand, understand, and make the appropriate countermeasures. 

 Currently, modular exchanges (UPS), power supply technology attention on Haipan Deng power are stepping up research on related technologies. UPS AC system is during the development of applications, the use of a sharp increase in China Telecom only the number of UPS systems in 2006 than in 2005, an increase of 79%, the whole network has nearly 3,000 sets of equipment in use. In practical applications, there are many devices in 1 +0 state at this time, the modular AC power supply (UPS) will play a very good advantage (module number is not greater than 6 is more suitable). China Telecom has been its use of technology for a more in-depth research, technical support department has made a part of the electrical performance test, and also some locations the practical test. Modular exchanges (UPS), power supply technology is close to the high-frequency switching DC power supply system will be extensive use of distributed power supply, modular AC power supply (UPS) systems will gradually replace the bloated and huge (N +1 ) AC (UPS), power supply system. 

 Use of high-voltage DC power supply technology in the field of communication studies is on the rise. 
 Regulator (http://www.pandeng.org.cn)