Broadcast: A method of sending a signal where multiple parties may hear a single sender. A pictured example of this: Imagine a room full of people. In this room, a single person starts yelling some information out. Some people may be sleeping, and not hear the yelling member in this group.
Some people may be awake, but not paying attentions so they are able to hear the person speaking, but choose to ignore the words that are being said. Another group of people may not only be awake, but be interested in what is being yelled. This last group is not only able to hear the person speaking but are also listening to what is being said.
In this example, you can see a single point is broadcasting a message to multiple locations that may or may not be able to hear it, and if they are able to hear it may choose to listen or not.
a. Radio stations are a good example of everyday life "Broadcast Network". In this case the radio station is a type of communications called Simplex. (In a simplex type of communication data is only expected to flow in one direction. In this case, away from the radio broadcast tower.)
b.Board-room meetings are another everyday example of a broadcast network. In this example, everyone may speak to everyone else, but when more than one persons peaks, interference from multiple conversations may make it impossible to listen to more than one conversation even though you can hear both conversations.
In this board-room example, we can see parties are able to share access to a common media (human voice as sound through the air). They compete for access to speak, but for the most part, only one person speaks at a time for everyone to hear. This is an example of a type of communications called Half-Duplex.
c. As a final example of a broadcast network in every day life, we can see a group of singers attempting to sing in Harmony at a practice, They can each speak separately on their own, but if they speak on different topics, the conveyed information for any of them may be lost by each other.
d. If we assume that these 4 singers are acting as a "Barber Shoppe Quartet" in a room by themselves, then we may see an example of another type of communication Full-Duplex.
e. This means that they are not only able to speak, but listen at the same time they are speaking All of them will speak and listen at the same time.
f. How is this possible? In order to sing in harmony, each singer must be able to hear the frequencies being used by the other singers, and strive to create a frequency with their voice that matches the desired frequency to create that harmony.
g. This feed-back of each singer to listen to the collective, and possibly key into a specific singer to listen to the collective, and possibly key into a specific singer's voice is used by them as they sing to create the exact frequency needed, and ensure their timing is the same as the rest of the singers. All members are able to hear all other members, and speak at the same time. They are all acting as a Full-Duplex communications in a broadcast network. (I am looking for a better example of a Full-Duplex broadcast system in everyday life.)
Point-to-point: A Method of communication where one "point" (person or entity) speaks to another entity. A woman in a restaurant whispers to her wife a message. Nobody else in the restaurant know what was said. The conversation was only between one point and another.
a. An example of a very simple simplex point-to-point network could be a doorbell ( the circuit.) When the doorbell button is depressed at the front door, a signal is passed to bell or buzzer which performs its functions to announce the button has been depressed. The buzzer, or bell does not send a message to button. The message travels in one direction, and only takes place between the button and the buzzer.(We ignore the issue of power consumption, and electron flow for the circuit, since the electrons are not the message.)
b. A rather violent and abrupt example of point-to-point Full Duplex communications can be seen in those old Television westerns when they have a showdown at "high noon" in town. Both of the cowboys have the ability to send messages, in the forms of high velocity projectiles made mostly of dense metallic bullets. They may start transmitting their messages at the same time, and these messages, are directed from one party to another. The bullet may not suddenly redirect itself to hit multiple targets (like might be possible for a message in a broadcast network, or non-uni-cast network like multi-cast). Even when the bullet happens to miss its target, and say stop in the ground, a point to point conversation has take place. In the case of a bullet hitting the ground, it would only be a simplex conversation.
and 2 others joined a min ago.
teamques10
★ 69k