Chapter 4 Flashcards
5 Basic Communication Media Types
Coaxial Cable Wireless Hybrid Fiber Optic Twisted Pair
Categories of Unshielded
3 4 5 5e 6 6a 6e 7 7a
Types of Interferences
EMI (Electromagnetic Interference)
RFI (Radio Frequency Interference)
Backbone Cabling
Main cable in your network; transfers main data between circuits
Plenum Cable
Does not emit a toxic vapor when burned through
Impedance
Restricts flow of currents, if there are no currents then there is no impedance
Coaxial Cable
2 types:
- thick: used as backbone
- thin: used to connect computers (no one uses anymore)
MAU
Media Access Unit
Allows computers to connect to coaxial cable
10Base5
10=cable transmission rate
Base=baseband connection
5=500 meters for cable run (distance)
Twisted Pair
Twisting reduces EMI and RMI 2 types: - Unshielded - Shielded Twisted uses RJ-45 connector
Shielded (STP)
Further reduces EMI and RFI
Unshielded (UTP)
No shielding between wires and encasement
Fiber Optic Cable
Used for cable backbone Advantages: - Multimode transmission capacity (high capacity) - No EMI or RFI - Low attenuation - Long distance - Secure against taping
Attenuation
When signal gets lost during travel
Horizontal Cabling
Cable that lays out on the floor
Connects workstation to server
Vertical Cabling
Connects server to server
Two Modes in Fiber Optic Cable
- Single mode: used for long-distance, one wavelength with no interference
- Multimode: used for multiple wavelengths with interference from itself not outside sources, support LED
Transmission Speeds
10 mbps 100 mbps 1 gbps 10 gbps 40 gbps 100 gbps
Network Interface Card’s 4 Components for a Connection
- communications medium
- hardware and protocols control firmware and drivers
- transceivers
- MAC sublayer support of Data Link Layer
Duplex Types
Half: one way transmission, one at a time sending
Full: transmission from both ways at the same time
Demand Priority
Ensures signal travels in one direction
Doesn’t use CSMA/CD along with 10 gbps ethernet
Transceiver
Device that transmits and receives signals on a communications cable
Sublayers
MAC: formats frames
LLC: initiates and maintains links between nodes
Bus
Data pathway inside the computer
