Symbian OS and Communication technical terminology full solution (i)

Symbian OS and some related information, a lot of content, and some very professional. Just collected and sorted out a technical terminology white paper, here first put up, everyone share.

1G

In mobile telephony, first-generation systems were analog, circuit-switched. Voice links were poor, handoff unreliable, capacity low, and security non-existent.1g systems the not now are active dev Elopment–indeed in some areas 1G spectrum are being auctioned for 2G and 3G use.

In mobile phone technology, the first generation system is analog circuit switching system. The voice connection is poor, the handoff is unreliable, the capacity is small, and the security is not available. Currently, 1G systems are no longer actively developed-indeed, in some areas, the 1G spectrum is being auctioned for 2G and 3G uses.

2G

In mobile telephony, second-generation protocols use digital encoding and include GSM, D-amps (TDMA) and cdma.2g networks are in, around the world. These protocols support the high bit rate voice and limited data communications. They offer auxiliary services such as data, fax and SMS. Most 2G protocols offer different levels of encryption.

In mobile phone technology, the second-generation protocol uses digital coding, which includes GSM, D-amps (TDMA) and CDMA. 2G Network is currently being used worldwide. These protocols support high-bit-rate voice and limited data-communication capabilities. They provide a variety of ancillary services, such as data, faxes, and SMS. Most 2G protocols provide different levels of encryption.

2.5G

In mobile telephony, 2.5G protocols extend 2G systems to provide additional features such as packet-switched connection (G PRS) and enhanced data rates (HSCSD, EDGE).

In mobile phone technology, the 2.5G protocol extends the 2G system to provide additional functionality such as packet switched connections (GPRS) and higher data transfer rates (HSCSD, EDGE).

3G

In mobile telephony, third-generation protocols support much higher data rates, measured in Mbps, intended for application s other than voice.3g networks trials started into Japan in 2001.3G networks are-expected to is starting in Europe and part Of Asia/pacific by 2002, and in the US later.3g'll support bandwidth-hungry applications such as full-motion video, vide O-conferencing and full Internet access.

In mobile phone technology, third-generation protocols support higher data transmission rates (in megabytes/sec), which are not only suitable for transmitting voice, but also support a wide range of applications. 3G Network Test began in Japan in 2001. By 2002, some parts of Europe and parts of the Asia-Pacific region have started using 3G networks and will later be used in the United States. 3G will support heavily bandwidth-intensive applications such as full motion video, video conferencing, and full Internet access.

Amps

Advanced Mobile Phone system:a 1G Standard which operates in the 800-900mhz-frequency band. It is still widely used the United States.

Advanced Mobile phone System: 1G standard operating at the 800-900mhz band. It is still widely used in the United States.

Analog

The simple way to transmit speech, which are translated into electronic signals of different frequency and/or. The networks for mobile phones, as as the broadcast transmissions, were analog. Due to being longer established in some countries, analog networks may offer better coverage than digital networks, Howeve R analog phones are less secure and suffer more from interference where the signal is weak. Analog systems include AMPS, NMT and ETACS.

A simple method for transmitting speech, which converts to an electronic signal of different frequencies and/or amplitudes. The first mobile network and broadcast transmission network are simulated. Since analog networks have been established in some countries for a long time, it may be wider than the digital network, however, analog handsets are less secure and more susceptible to interference under weaker signals. Simulation systems include amps, NMT and Etacs.

Api

Historically, "Application programming Interface". Practically, an API are any interface which enables one program to use facilities provided by another, whether by calling th At program, or by being called by it. At a higher level still, an API are a set of functionality delivered by a programming system, and as such the mix of APIs I n A particular system tells you what the system can do.

Historically refers to the "application programming Interface". In fact, an API is any interface that allows one program to use another program's functionality (by calling another program or by another program). On a higher level, an API is a set of functions provided by a programming system, and similarly, different APIs in a particular system tell you what the system can do.

Bluetooth

An open specification for seamless wireless short-range communications of data and voice between mobile and both Y devices. For instance, the It specifies how mobile phones, computers and PDAs interconnect with each other, with computers, and with Fice or home phones. The generation of Bluetooth permits exchange of data up to a rate of 1 Mbps/second, even in areas with much elec Tromagnetic disturbance. It transmits and receives via a short-range radio link using a globally available frequency (band GHz ISM 2.4).

Open specification for wireless communication between mobile devices and fixed devices for short distances between data and speech. For example, it specifies how the phone, computer, and PDA are interconnected, and how to interconnect with a computer, office phone, or home phone. The first generation of Bluetooth allows data to be exchanged at the highest 1mbps/s rate, even in areas where electromagnetic interference is more severe. It uses a globally available band (2.4 GHz ISM Band) to transmit and receive data via short-range wireless links.