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13, the pseudo-random sequence spread spectrum, increased security,CDMA was originally a military communications standards, gradually moving towards civil innate advantage in confidentiality. Laptop battery state-of-the-art spread spectrum coding and air interface encryption technology to ensure the security of user communication.Second, the transition to 3G contrast,In the wireless access network, GPRS is based on TDMA, if you upgrade to WCDMA or TD-SCDMA, need to re-construction of the base station, only some of the supporting resources, such as power can be reused.power control technology to enhance system capacity. The CDMA20001X technology is transition to 3G CDMA1XEV research and standardization work in progress, an enhanced version 1x EV-DO (HDR) has been accepted by the ITU as an international standard, 1X EV DO standards are being developed. 1X EV DO is completely wireless technology designed for packet data services can be provided in a 1.25MHz bandwidth peak rate of 2.4Mbit / s, ITU has reached the rate of three generations of system requirements. HDR technology, the packet data service is still using the packet domain equipment (PDSN and PCF) to deal with, no need to add the network elements. Part of the core network, GPRS core network and 3G packet core network can achieve a smooth upgrade and evolution. And be able to maintain backward compatibility. CDMA core network part of the circuit domain and packet domain, the basic framework remains the same, just a simple update. Both in the core network portion can be kept substantially smooth transition. More than just a functional part, due to the growth of the the user operational capabilities or the number of users, in addition to upgrading the necessary expansion and additional equipment is also essential, depends on the specific network equipment capacity. HP 530 battery HP Business NoteBook nx6320 battery HP EliteBook 8440p battery HP EliteBook 8530p battery
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