The cabling (wire type, how it is twisted in the cable jacket) and connectors (termination plugs, patch panels etc.) all meet certain standards that primarily have the goal of ensuring that an electrical signal (or optical in the case of fiber) introduced at one end makes it to the other end with only a certain amount of degradation.
The ports / network interface cards / transceivers at the ends of the path have the capability to recover a signal that has been transmitted over that cabling and intervening connectors as long as it has not been degraded beyond the specification by any one of those components or the interaction between them.
So all the parts need to work together to ensure reliable end to end transmission of the signal. Often we see the cabling specification (i.e Cat 5e UTP, OM-3 fiber, etc.) cited as it is the most variable element of the equation.
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
As Marvin has already described, distances are defined by standards, and signal quality degradation from sender to receiver much influences distance limitations. However, there's other factors involved in setting distances.
For example, in original (shared media) Ethernet, part of the distance limitation was how long it would take for a beginning of a frame to reach another host as part of collision detection. And, if a collision is detected, how long to transmit the "jam signal" to insure all hosts "see" it.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...