There is an article that takes that link above to absolute pieces, 1 step at a time. It's been posted here before.
I'll have a look, see if I can find it.
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Helix RCAs
Started by Marlin, Oct 31 2003 12:51 AM
16 replies to this topic
#17
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Posted 07 November 2003 - 01:48 PM
quote from the link
"Computer networks use TRUE BALANCED LINE systems, that means that the two cables that carry each signal are exactly the same, same length, same construction, same thickness, same impedance, same capacitance! But so are the senders and receivers of the signal in the wire... So not just the two conductors in the wire are the same but the amplifier that sends the signal out has the same characteristics in both of its terminals, and the receiver at the other end of this wire also has identical characteristics in both of the terminals... Each of the two equal wires also carry an equal signal (although electrically inverted) when in use, there is actually an amplifier for EACH of the pair and a receiver for each wire in the pair"
no ethernet 802.3 standard via cat 5 is not differnetial unless you use the t4 standard which use all the conductors in the cat 5 cable...hmmmmm havent seen this in networks that ive worked on. If ya have noise porblems we use optical now.
Normal ethernet 802.3 uses 2 pair one pair for tx one pair for rx. Thats 4 conductors. Differnetial requires at least 6 (tx 3 cables 2 signal 1 common ground).
Also cat5 is designed with differnet twistings on each pair to reduce cross-talk so the inductance and capacitance of each pair is different.
RS422 is a balanced line transmission standard this is a serial communication standard like the normal non differential rs232 serial port on the back of all our pcs.
howerver it is interesting to see that the standard rcas induced less noise when they were close to the neon light.
with that being said coax has always been better for noise rejection in data communication. Cat5 has taken over due to ease of installment, cost and better dsp noise elimination techneques.
it would be good to do some tests similar to eddies to see what happens.
pitty eddie does not have his facts right about the typical ethernet network we use everyday.
"Computer networks use TRUE BALANCED LINE systems, that means that the two cables that carry each signal are exactly the same, same length, same construction, same thickness, same impedance, same capacitance! But so are the senders and receivers of the signal in the wire... So not just the two conductors in the wire are the same but the amplifier that sends the signal out has the same characteristics in both of its terminals, and the receiver at the other end of this wire also has identical characteristics in both of the terminals... Each of the two equal wires also carry an equal signal (although electrically inverted) when in use, there is actually an amplifier for EACH of the pair and a receiver for each wire in the pair"
no ethernet 802.3 standard via cat 5 is not differnetial unless you use the t4 standard which use all the conductors in the cat 5 cable...hmmmmm havent seen this in networks that ive worked on. If ya have noise porblems we use optical now.
Normal ethernet 802.3 uses 2 pair one pair for tx one pair for rx. Thats 4 conductors. Differnetial requires at least 6 (tx 3 cables 2 signal 1 common ground).
Also cat5 is designed with differnet twistings on each pair to reduce cross-talk so the inductance and capacitance of each pair is different.
RS422 is a balanced line transmission standard this is a serial communication standard like the normal non differential rs232 serial port on the back of all our pcs.
howerver it is interesting to see that the standard rcas induced less noise when they were close to the neon light.
with that being said coax has always been better for noise rejection in data communication. Cat5 has taken over due to ease of installment, cost and better dsp noise elimination techneques.
it would be good to do some tests similar to eddies to see what happens.
pitty eddie does not have his facts right about the typical ethernet network we use everyday.
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