TCP/IP (Transmission Control Protocol/Internet Protocol) is the basic communication language or protocol of the Internet. It can also be used as a communications protocol in a private network (either an intranetor an extranet). When you are set up with direct access to the Internet, your computer is provided with a copy of the TCP/IP program just as every other computer that you may send messages to or get information from also has a copy of TCP/IP.
The PSTN – Digitization
Voice
frequency is 100 - 5000 Hz, with the main portion from 300 – 3400 Hz
Nyquist
Theorem states that sampling must be done at twice the highest frequency to
recreate. 4000 Hz was chosen as the maximum frequency, thus sa…Read More
HUB
Hub
Hub—This is used to interconnect networking devices. A drawback to the hubis
that it broadcasts the data it receives to all devices connected to its ports.
The hub has been replaced by the network switch in most m…Read More
PSTN Evolution
q1876
invention of telephone
q1915
first transcontinental telephone (NY–SF)
q1920’s
first automatic switches
q1956
TAT-1 transatlantic cable (35 lines)
q1962
digital transmission (T1)
q1965
1ESS analog …Read More
Ring Topology
Add caption
In
a bus system the computers share the media (coaxial cable) for data
transmission. In this topology, a coaxial cable (called ThinNet) is looped through each networking
device to facilitate data transfer.…Read More
Network Compenent
Network Compenent
The MAC address, also called the Ethernet, physical, hardware, or adapter address,
can be obtained from computers operating under Microsoft Windows by typing the ipconfig
/all command while in the co…Read More
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