Copper Cabling The importance of cable - Fundamental to network communication o Incredibly important foundation Usually only get one good opportunity at building your cabling infrastructure The vast majority of wireless communication use cables Twisted pair cobber cabling - - - Balanced pair operation o Two wires with equal and opposite signals o Transmit+, Transmit- / Receive+, ReceiveThe twist is the secret o Keeps a single wire constantly moving away from the interference o The opposite signals are compared on the other end Pairs in the same cable have different twist rates Copper cable categories A – augmented E – enhanced Shielded only Coaxial cables - Two or more forms share common axis RG-6 used in television/digital cable o And high-speed internet over cable Twinaxial cable - Two inner conductors o TWINS Common on 10 gigabit ethernet SFP+ cables o Full duplex o Five meters o Low cost o Low latency compared to twisted pair Structured cabling standards - - International ISO/IEC 11801 cabling standards o Defines classes of networking standards Telecommunications Industry Association (TIA) o Standards, market analysis, trade shows, government affairs, etc. o ANSI/TIA-568 : Commercial Building Telecommunications cabling standard o http://www.tiaonline.org Commonly referenced for pin and pair assignments of eight-conductor 100-ohm balanced twisted pair cabling o T568A and T568B T568A and T568B Termination - Pin assignments from T568-B standard o Eight conductor 100-ohm balanced twisted-pair cabling T568 and T568B are different pin assignments for 8P8C o Assigns the T568A pin-out to horizontal cabling Many organizations traditionally use 568B o Difficult to change in mid-stream Normally, an organization would pick which standard they’re going to follow, and then they use that for their entire infrastructure. You can’t terminate one side of the cable with 568A and other with 568B o You’ll most likely run into confusion and technical problems The 568A or B standard is not related to Ethernet crossover!!!!
