COMMUNICATION Categories (Part 4)


 

I HAVE SO MANY OPTIONS
for connecting with others

PREVIOUS: Categories #3

QUOTE: “A genius is capable of making the complex simple.
An idiot is capable of making the simple complex!”

 


CATEGORIES of Communication
(Comm) cont.

6a. Re. Mechanical Networks
a. Local Area – A network of computers in a localized area, such as office or school. All are connected through the LAN via a hub or a switch. A large number of computers drag down the speed of a LAN

b. Wide area – Covers a large geographical area, usually made up of multiple computer networks. The Internet is a WAN that relies on a large global interface of service providers using routers, switches, modems & servers, which carries data, media & Web pages

c. Public Switched –  A network of circuit-switched telephones – basically the phone version of the Internet. Today it’s mainly digital, which includes services for both cells & landlines

d. Telecommunication – The transmission of signals over a large distance, usually by electromagnetic waves. It’s used for TV, radio & phones, as well as computer data

e. Wireless – It provided info transmission & network connectivity to devices without cables or wires – such as broadcast radio – over long geographical distances. Wi-Fi is for computers & Bluetooth is a shorter-range version, which connects with a nearby mobile phone

f. Satellite – It comes in several types, such as those used by phone companies. Some provide navigation info, military surveillance or weather data. Others provide TV programming, radio broadcasts, even broadband Internet service

TOPOLOGIES : the ways component parts are interrelated or arranged
NODE:  hub or switch // workstation or other device

STAR – a comm. network where each component is attached to a central node, with a point-to-point connection. This reduces the probability of network failure. All peripheral nodes can only communicate with all others by transmitting to, and receiving from, the central node

BUS – each node is connected to a single cable – the network’s backbone – via interface connectors. A signal from the source travels in both directions to all connected machines until it finds the intended recipient. If the machine address does not match the intended address for the data, it ignores the sent info

RING – a  bus topology LAN in a closed loop, forming a single continuous pathway for signals going through each node, with data only traveling around the ring in one direction. When data is sent from any one node to another, it passes through each intermediate node until it reaches its destination

MESH – a LAN, WLAN or VLAN. In ‘full mesh’, each network node is connected directly to all the others. In partial mesh, some nodes are connected to all, while others are only connected to those nodes they exchange the most data with

Mesh networks are expected to play an important part in the Internet of Things (IoT). Unlike the star, which require a router to deliver Internet service, network nodes are decentralized, so they can “talk” directly to each other without requiring an Internet connection. A big advantage is that there can’t be a single point of failure (SPoF).

IoT – In 2016 30 cities (including Phoenix, Dallas & Fort Worth) were connect to a new M2M network specifically geared towards the Internet of Things (IoT), by Ingenu, the company building the project. The Machine Network, as it will be called, will be the “largest exclusive IoT and M2M network serving 100 million users in the U.S. covering nearly 100,000 square miles.”
The technology is designed to avoid interference by being able to self-modulate within the band to find a clear signal at both network & device levels

HYBRID networks – combining 2 or more basic topologies, so the resulting network is different (not bus, star, ring…..). EXPs: A tree network is a star interconnected via a bus , but a Tree connected to another Tree is still topologically the same, not a distinct type. A star-ring network consists of two or more ring networks connected, using a multi-station access unit (MAU) as a centralized hub. 2 other hybrids are hybrid mesh and hierarchical star. (MORE…. Wikipedia)

 EDITORIAL comment: NOTE all the acronyms!
NEXT: Comm. Categories #5
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