Technology Guide 4. Telecommunications. Hardware Communications media Communications networks Communications processors. Communications software Data communications providers Communication protocols Communications applications. Telecommunication System.
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Data communications providers
Communications applicationsTelecommunication System
Atelecommunication system is a collection of compatible hardware and software arranged to communicate information from one location to another. The major components include;
Analog signals are continuous waves that “carry” information by altering the amplitudeand frequencyof the waves.
Digital signals are discrete on-off pulses that convey information in terms of 1s and 0s, just like the central processing unit in computers.Electronic Signals
Telecommunications media can carry two basic types of signals;
Twisted pair wire
Fiber optic cable
Global positioning system
Radio & Infrared lightWireline vs. Wireless Media
Mobile computing refers to the use of portable computer devices in multiple locations.
Personal communication service (PCS) uses lower-power, higher frequency radio waves than cellular technology. As a result, PCS cells are smaller, more numerous and closer together.
Personal digital assistants (PDAs) are small, pen-based, hand-held computers capable of digital communications transmission.
Bluetoothis a relatively new technology that allows wireless communication between mobile phones, laptops, and other portable devices.Wireless Technologies
The major types of standards are;
Layer 1:Physical layerLayer 5: Session layer
Layer 2: Data link layerLayer 6: Presentation layer
Layer 3: Network layerLayer 7: Application layer
Layer 4: Transport layer
An interface is a physical connection between two communications devices.
Parallel data transfer
Serial data transfer
The topology of a network is the physical layout and connectivity of a network.
Star networkInterface & Topology
Gateway, bridge, router
Network Interface Cards
Private branch exchange (PBX)
Wide area networks (WAN)
Value-added Network (VAN)
Virtual private network (VPN)Network Size
There are two general network sizes:
There are five models of client/server implementation;