WEEK 9
TOPIC: ICT Gadgets – the GSM
ICT Gadgets: – The GSM
The GSM (Global System for Mobile Communications) is a second- generation digital mobile telephone standard using a variation of Time Division Multiple Access (TDMA). It is a mobile telephone using a wireless technology that allow users to communicate with people that are not within their reach.
It is the most widely used of the three digital wireless telephone technologies – CDMA (Code Division Multiple Access), GSM and TDMA.
It operates at either the 900, 1800 or 1,900MHz frequency bands.
TECHNICAL DETAILS
The GSM network can be divided into three broad parts
The subscriber carries the mobile station
The base station subsystem controls the radio link with the
mobile station
The network subsystem performs the switching of calls
between the mobile users and other mobile and fixed
network users
Questions
- State the full meaning of GSM
- State how to send messages of GSM
WEEK 10
TOPIC: ICT Gadget- fax and telephone
FAX
Fax (short for facsimile), sometimes called telecopying or telefax , is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other output device. The original document is scanned with a fax machine (or a telecopier), which processes the contents (text or images) as a single fixed graphic image, converting it into a bitmap, and then transmitting it through the telephone system in the form of audio-frequency tones. The receiving fax machine interprets the tones and reconstructs the image, printing a paper copy.
TELEPHONE
Telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals suitable for transmission via cables or other transmission media over long distances, and replays such signals simultaneously in audible form to its user.
