مصباح
25-11-2007, 04:54 PM
بمناسبة إني لسة النهاردة مدخل خط تليفون أرضي عندي في البيت شغال بخاصية ال
CDMA
اللاسلكية
قلت أما أنقل لكم بعض المعلومات العامة عن هذه التكنولوجيا الجديدة مع مقارنتها بال
GSM
اللي الموبايلات بتاعتنا شغالة بيها
Short for Code-Division Multiple Access, a digital cellular (http://www.webopedia.com/TERM/C/cellular.htm) technology that uses spread-spectrum techniques. Unlike competing systems, such as GSM (http://www.webopedia.com/TERM/C/GSM.htm), that use TDMA (http://www.webopedia.com/TERM/C/TDMA.html), CDMA (http://www.webopedia.com/TERM/C/CDMA.html#) does not assign a specific frequency to each user. Instead, every channel (http://www.webopedia.com/TERM/C/channel.htm) uses the full available spectrum. Individual conversations are encoded with a pseudo-random digital sequence. CDMA consistently provides better capacity for voice and data communications (http://www.webopedia.com/TERM/C/CDMA.html#) than other commercial mobile technologies, allowing more subscribers to connect at any given time, and it is the common platform on which 3G technologies are built. CDMA is a military technology first used during World War II by English allies to foil German attempts at jamming transmissions. The allies decided to transmit over several frequencies, instead of one, making it difficult for the Germans to pick up the complete signal. Because Qualcomm created communications chips for CDMA technology, it was privy to the classified information. Once the information became public, Qualcomm claimed patents on the technology and became the first to commercialize it
http://en.wikipedia.org/wiki/CDMA
http://www.wisegeek.com/what-is-the-difference-between-gsm-and-cdma.htm
http://www.bee.net/mhendry/vrml/library/cdma/cdma.htm
http://www.cellular.co.za/cdma.htm
بالمناسبة ... الجهاز بتاعها المفروض انه بيديك خاصية استعماله ك
USB modem
مزيد من التفاصيل بقا اسألوا عليها ابن الحصري أعتقد انه عنده المزيد ليفدنا به
CDMA
اللاسلكية
قلت أما أنقل لكم بعض المعلومات العامة عن هذه التكنولوجيا الجديدة مع مقارنتها بال
GSM
اللي الموبايلات بتاعتنا شغالة بيها
Short for Code-Division Multiple Access, a digital cellular (http://www.webopedia.com/TERM/C/cellular.htm) technology that uses spread-spectrum techniques. Unlike competing systems, such as GSM (http://www.webopedia.com/TERM/C/GSM.htm), that use TDMA (http://www.webopedia.com/TERM/C/TDMA.html), CDMA (http://www.webopedia.com/TERM/C/CDMA.html#) does not assign a specific frequency to each user. Instead, every channel (http://www.webopedia.com/TERM/C/channel.htm) uses the full available spectrum. Individual conversations are encoded with a pseudo-random digital sequence. CDMA consistently provides better capacity for voice and data communications (http://www.webopedia.com/TERM/C/CDMA.html#) than other commercial mobile technologies, allowing more subscribers to connect at any given time, and it is the common platform on which 3G technologies are built. CDMA is a military technology first used during World War II by English allies to foil German attempts at jamming transmissions. The allies decided to transmit over several frequencies, instead of one, making it difficult for the Germans to pick up the complete signal. Because Qualcomm created communications chips for CDMA technology, it was privy to the classified information. Once the information became public, Qualcomm claimed patents on the technology and became the first to commercialize it
http://en.wikipedia.org/wiki/CDMA
http://www.wisegeek.com/what-is-the-difference-between-gsm-and-cdma.htm
http://www.bee.net/mhendry/vrml/library/cdma/cdma.htm
http://www.cellular.co.za/cdma.htm
بالمناسبة ... الجهاز بتاعها المفروض انه بيديك خاصية استعماله ك
USB modem
مزيد من التفاصيل بقا اسألوا عليها ابن الحصري أعتقد انه عنده المزيد ليفدنا به