cabling and topology

a single cable connects all of the computers in a line. terminations are required at each end of the bus to keep data from reflecting at the ends.

connects all the computers on the network with a ring of cable. Data will move in one direction, from one computer to the next. No termination is required.

a central connection that links all computers. this offers fault tolerance in case a cable breaks; all other computers will still be able to communicate

fault tolerance of a star, but a ring within the central box. 

physical layout of a star, but a logical layout of a ring

shrunk down into a small box

physical star, logical bus. provides fault tolerance

when physical topology is combined with a logical or signaling topology

every node connects to every other node in two or more routes.

every computer connects to every other computer

at least two machines have reduntant connections.

almost like a star topology, but the central point cannot be a device that simply provides a path for information: it must be intelligent. it is a single point through which all others converse

two computers connect directly together. They require no central device between them.

an application of a topology and other technologies which provide a way for data to get from one point to another.

ie 10BaseT, 1000BaseF, and 10GBaseLX

the central core and the braided shield share a common axis.

central core, insulation, a braided metal shield, and a jacket.

BNC: like the one on military radios

F-connector: like the one for cable TVs with a screw

UTP (unshielded twisted pair): copper wires with twists that reduce crosstalk or interference. The more twists, the less crosstalk.

STP (shielded twisted pair): twisted pairs of wires surrounded by shielding to protect them from EMI.

measured in MHZ, or the highest frequency the cable can handle and bandwidth

• 3     16 MHz / 16 Mbps
• 5     100 MHz / 100 Mbps
• 5e   100 MHz / 1000 Mbps
• 6     250 MHz / 10,000 Mbps                                                                                                                                    can use full 100 meter length when used with 10/100/1000BaseT networks.                                                             with 10GbaseT networks, it's limited to 55 meters
• 6a   500 MHz / 100,000 Mbps                                                                                                                                     can use full 100 meter length with networks up to 10GbaseT 

RJ 11

- for phones. have 4 wires

RJ 45

- for networks. have 8 wires

transmit light, making it great for high EMI areas and long-distance transmissions.

4 parts:

the glass core

cladding (which makes light reflect down the fiber)

buffer to give strength

insulating jacket.

SMF: lasers

-prevents  modal distortion (signals sent at the same time won't ARRIVE at the same time because the paths differ slightly). 

MMF: LED lights

ST; snap and twist

SC; stick and click

LC; little connector

      is designed for duplex fiber optic