Ethernet Basics and Cable Types
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What does CSMA/CD stand for?
Carrier Sense Multiple Access with Collision Detection
10Base-T is specified by what Standard? What does the T stand for? Whats the maximum length? What does the 10 stand for?
IEEE 802.3, Twisted Pair, 100 meters, 10 Megabits Per Second capacity.
Ethernet is considered to by what type of topology?
Fast Ethernet is defined as? Whats the maximum capacity? Length?
IEEE 802.3u, 100 MBPS, 100 meters
GigaBit Ethernet is define as? How long? Speed?
IEEE 802.3z and 802.3ab, 100 meters, 1GBPS
What is the standard cabling type?
CAT 5 UTP
The endpoints of the wires are refered to as?
Pins 1 & 2 do do what?
Pins 3 & 6 do what?
What is the benefit of twisting the cables?
Reduces that amount of electromagnetic interference.
What is Crosstalk?
Electromagnetic interference that "crosses over" from one pair of cables to another making the signal unusable.
What does NEXT stand for? What is NEXT?
- NEXT is (near end crosstalk). This is cause by
- crossed or crushed pairs of wires.
What does FEXT stand for?
Far End Crosstalk
This cable connects different devices. The wire connect to Pin 1 on one side is connected to Pin 1 on the other side. The wire connected to Pin 2 on one side is connected to Pin 2 on the other and so fourth.
Straight through cable
You need to connect two similar devices directly with Ethernet. Example 2 switches need to be connected together.
Local Cable End - Pin 1 Pin 2 Pin 3 Pin 6
Remote Cble End-Pin 3 Pin 6 Pin 4 Pin 2
These wires will cross over
Cross over cable
You use this cable to connect a laptop directly to the switch or router. All eight wires in the cable will "roll over" to another pin at the remote end. Pin 1 at one end rolling over the Pin 8 at the other end. Pin 2 one end rolling over to Pin 7 at the other end, and so fourth. It also has a DB-9 connector
Routers typically use this cable for connection to a Frame Relay network.
What would you like to do?
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