Media and Cable Distribution Flashcards
Media
Material used to transmit data over the network
Copper Media Types
▪ Three categories:
● Copper
● Fiber optic
● Wireless
Coaxial Cable (COAX)
Inner
● Insulated conductor or center wire passes data
▪ Outer
● Braided metal shield used to help shield and protect the data
transmission
● Provides EMI resistance due to shielding
Coaxial Cables
RG-6
● Commonly used by local cable companies to connect individual
homes
▪ RG-59
● Typically used to carry composite video between two nearby
devices, such as from a cable box to the television
Coaxial connectors
▪ F-connector
● Typically used for cable TV and cable modem connections
▪ BNC
● Termed Bayonet Neill-Concelman or British Naval Connector
● Was used for 10BASE2 Ethernet networks
Twinaxial cable
Similar to coaxial cable but uses two inner conductors to carry the data
instead of just one
Serial cable
Usually have a series of straight copper wires inside a single cable or
plastic jacket
▪ DB-9 or DB-25 (RS-232)
● 9-pin or 25-pin D-subminiature
● Used for asynchronous serial communications and connecting to
an external modem
Twisted pair cables
▪ Most popular physical LAN media type
▪ Eight individually insulated strands of copper wire inside each cable
▪ Each pair twisted together to reduce EMI
● Tighter twists = less EMI
▪ Types:
● Unshielded Twisted Pair (UTP)
● Shielded Twisted Pair (STP)
Unshielded twisted pair (UTP)
▪ Number of twists determines how much EMI can be blocked
● CAT 6 has more twists per inch than CAT 5
▪ UTP is cheaper than STP
▪ Media of choice in most LANs
Shielded twisted pair (STP)
▪ Wires are twisted in pairs and surrounded in a metallic shielding to
minimize EMI
▪ Outer shielding minimizes EMI, but makes STP cost more than UTP
Twisted pair connectors
RJ-45
● 8-pin connector in Ethernet networks
● Most Ethernet use only 4-pins
▪ RJ-11
● 6-pin connector
● Commonly only 2 or 4 pins are used
● Commonly found in telephone systems
Registered Jack (RJ)
▪ Used to carry voice or data which specifies the standards a device needs
to meet to connect to the phone or data network
Bandwidth
▪ Theoretical measure of how much data could be transferred from a
source to its destination
Throughput
▪ Actual measure of how much data transferred from a source to its
destination
Cable Legths
▪ Keep cable runs under 70 meters from the IDF to the office