Digital communication

This a blog about my current work on digital communcation and my interactive college website.

Wednesday, 15 December 2010

MMS


Multimedia Messaging Service (MMS) is a new standard in mobile messaging. Like SMS (Short Messaging Service), MMS is a way to send a message from one mobile to another. The difference is that MMS can include not just text, but also sound, images and video. It is also possible to send MMS messages from a mobile phone to an email address.


MMS is an extension of the SMS protocol, making its usage familiar to existing SMS users. An MMS message is a single entity, not a collection of attachments. One of the main practical differences between MMS and SMS is that whilst SMS messages are limited to 160 bytes, an MMS message has no size limit and could be many Kbytes in size, or even larger. MMS requires a third generation (3G) network to enable such large messages to be delivered, although smaller messages can be sent even with second generation networks using GPRS.

Wednesday, 8 December 2010

VOIP

VoIP (voice over IP) is an IP telephony term for a set of facilities used to manage the delivery of voice information over the Internet.VoIP involves sending voice information in digital form in discrete packets rather than by using the traditional circuit-committed protocols of the public switched telephone network (PSTN). A major advantage of VoIP and Internet telephony is that it avoids the tolls charged by ordinary telephone service.

IP stands for Internet Protocol. An IP address is a long and unique number that devices use to identify and communicate with each other. When you log into the internet your computer equipment is essentially given a unique (to keep the explanation simple) number.

Broadband


Broadband refers to a form of telecommunication that allows large amounts of information to be transmitted to your home computer from the outside world, e.g. from the Internet. Broadband transfers data at least 10 times faster than standard dial-up, because it provides wide band of frequencies to transfer data at the same time…in other words a much fatter pipe to push data through.

ADSL Asymmetric Digital Subscriber Line, or DSL for short. is a high-speed Internet access service that utilizes existing copper telephones lines to send and receive data at speeds that far exceed conventional dial-up modems.