Hi all.
This is not a textbook problem, but something I thought about today when riding home from school on my bike.
A few years ago, our computers at home were connected by coaxial-cables just like in this image: http://www.muellerelectric.com/images/BU5050B.jpg
On the last computer in the network, one side of the T-BNC (as seen here: http://media.digikey.com/photos/Amphenol%20Photos/31-8,%2031-208.jpg) had an end attached to it (a picture of the end piece is here: http://www.morecomputers.com/openimages/Belkin/OR1230000054155.jpg).
Now my question is: As far as I have understood, the end piece terminates the coax.-cable, so no signal is reflected at the end. But in order for this to happen, the resistance of the end piece must be exactly the same as the total impedance of the coax.-cable (please correct me when I am wrong).
But doesn't the impedance of the cable depend on its length? So how can the end piece, which has a fixed resistance, be used with a cable, which has an impedance dependant on its length?
Thanks in advance!
This is not a textbook problem, but something I thought about today when riding home from school on my bike.
A few years ago, our computers at home were connected by coaxial-cables just like in this image: http://www.muellerelectric.com/images/BU5050B.jpg
On the last computer in the network, one side of the T-BNC (as seen here: http://media.digikey.com/photos/Amphenol%20Photos/31-8,%2031-208.jpg) had an end attached to it (a picture of the end piece is here: http://www.morecomputers.com/openimages/Belkin/OR1230000054155.jpg).
Now my question is: As far as I have understood, the end piece terminates the coax.-cable, so no signal is reflected at the end. But in order for this to happen, the resistance of the end piece must be exactly the same as the total impedance of the coax.-cable (please correct me when I am wrong).
But doesn't the impedance of the cable depend on its length? So how can the end piece, which has a fixed resistance, be used with a cable, which has an impedance dependant on its length?
Thanks in advance!