CCNA/CCNP preparation notes

by Andreas Ryf
OSI reference model
IP Network Classes
Subnetting
Cables & fibres
optical fibres
Twisted pairs
Coax
Terms
Links
BCMSN
ONT

Bus system with RG58 coaxial cable, was very popular (because cheap) and needed no active components.

Could cover distances up to 180 meters.

CSMA/CD, all stations transmit on the only wire, therfore of course only half-duplex possible and many collisions.

To cover more distance, some models of coax-hubs existed, but were not very widespread.

 

Thick-cable could cover up to 500 meters, needed special pins to tap into the center conductor in order to connect a thin cable (RG58) or a workstation.

 

Coaxial cable for bus-topology are definitely obsolete.

 

Cisco uses a twin-coax (RG6) for their 1300-series outdoor access-points, transmits a 100MBit/s link plus 48V over more than 100 meters.


 

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