is a special-purpose communication protocol designed for text messaging • Multimedia Messaging Service (MMS) – It is an extension to SMS to enable transmission of videos in addition to text • Wireless Application Protocol (WAP) – It is a specialized communication protocol for mobile browsers. WLL (Wireless Local Loop) WLL is a system that connects subscribers to the local telephone station wirelessly. Wireless local loop is used for wireless communication links which deliver plain old telephone services or broadband services to customers. This is an ideal application which provides telephone services remotely and is mostly used in developing countries where cable infrastructure is either expensive or speed is not fast.
This wireless link can be a part of the connection between the subscribers and switch. This system is based on radio networks which provide services like telephone in remote areas. Different types of wireless local loop include Broadband Wireless Access, Radio in the Loop, Fixed Radio Access and Fixed Wireless Access. All 4G service is called 4G or 4G LTE(Long Term Evolution), the underlying technology is not the same with every carrier.
Some use WiMax technology for their 4G network, while Verizon Wireless uses a technology called Long Term Evolution, or LTE(Long Term Evolution). . . Internet Applications .
. . SMS SMS stands for Short Message Service. It is commonly referred to as "text messaging,".
It is a service for sending short messages of up to characters ( characters if using a -bit mode) to mobile devices, including cellular phones, smartphones and PDAs. Voice Mail System (VMS) and answering Machine Voice mail system can be thought as a message box for phone user to store voice messages and retrieve it through telephone. User can divert all his calls to his voice mail system when he wishes so. Figure .
Voice Mail System Main difference between answer machine and voice mail system is that voice mail system is a centralized system where voice mail boxes are managed for many users, while answering machine is an independent individual system connected to a telephone line. Many telephone instrument comes with built-in answering machine.