usually a new connection or by switching to achieve. DECT has the ability to switch the slot, in order to improve the communication quality.DECT support voice and data communications, and there are a wide range of other applications, such as the phone wireless local loop (WLL), private branch exchange (PBX) applications and so on. DECT into the pre-application is mainly used for residential area cordless voice applications. Currently, DECT has started successfully applied in the data communication. Skype is a program, use the program to be able to make free online calls. The 10ms time division multiple access (TDMA) frame (see Figure 1) within the slot 24. 24 slots are divided equally into two groups of 12 time slots. One group for forward transmission and one for reverse transmission. The channel data rate of 32kbps. The data rate of the voice communication for performing adaptive differential pulse code modulation (ADPCM) for 32 kbps. As for the data transmission, the use of cyclic redundancy check (CRC), the data rate of each channel is able to provide only 24kbps. Therefore, in order to improve the data rate, it is necessary to simultaneously use a plurality of channels. Using a symmetric connection, available up to channel 12 (12 * 24 = 288kbps). Laptop battery can be used in order to achieve a higher data rate, the asymmetric channel connection. In this case, at least one slot for receiving confirmation, therefore, there are 23 slots can be used for transmission speeds of up to 264kbps (23 * 24 = 532kbps).The lower layers of the the DECT protocol architecture and the Open Systems Interconnection (OSI) reference model are closely related. DECT has a physical layer, a data link layer and a network layer. The laptop battery data link layer by the Media Access Control (MAC) layer and the data link control (DLC) layers. Dell Inspiron n4010 battery Dell Inspiron n5010 battery Dell Inspiron n5030 battery Dell Inspiron n5110 battery
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