Search        Show me     Select > >   Career Opportunities   The team   3G Network   Media contacts		Go to >       A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #   Access The link between customer and telecoms network. A variety of technologies are used including copper wires, fibre optics, mobile, microwave and satellite. Asymmetric Digital Subscriber Line (ADSL) Digital technology to allow broadband service over ordinary copper telephone lines. Transmission capacity is greater from network to customer (c1.5Mbps) than customer to network, hence asymmetric. Analogue Information conveyed in a continuously varying electronic signal, unlike a digital signal which varies between two constant values. The first mobile networks were analogue. Analogue Signal (AS) A signal sent using an analogue system ie with no specified limit on transmitted data. Antenna Device used for transmitting or receiving electromagnetic radiation at radio frequencies. Attenuation Loss of signal strength in a lightwave, electrical, or radio signal that is usually related to the distance the signal must travel. For example, fiber-optic transmission must be regenerated approximately every 30 miles. Radio signal attenuation may be due to atmospheric conditions, sun spots, antenna design or positioning, and line-of-sight obstacles. Usually expressed as a ratio in decibels (Db). Advanced Mobile Phone Service (AMPS) Analogue cellular telephone technology used mainly in the US. Operates in the 800Mhz band frequency. This was the original American analogue cellular radio system used by AT&T (the digital enhancement was originally called D-AMPS, and is now known as TDMA). About 40% of Latin American and 25% of North American subscribers are on AMPS. The bulk of AMPS migration is to CDMA-One and TDMA.
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