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Gigabit Ethernet runs on UTP also.
"Meindert Sprang" wrote in message ... "John Proctor" wrote in message news:2005021307082216807%lost@nowhereorg... Meindert, An interesting thing is that STP is almost never used outside Europe. The company that I used to run here in Australia kept both on their books but we never sold any STP that I know of. BTW we might have as I was the MD not the sales manager ;-) I have a Kenwood D700 Amateur radio (VHF/UHF) in my car. The microphone connects to the radio via an RJ45. The control head connects to the radio via an RJ11-RJ12 4 core cable. When you remote the radio (mine is in the back of a Volvo X70 station wagon where the spare tire is kept) there is a relatively long run to the control head and microphone. I used Cat 5e to extend the microphone connection. Works great no RF feedback, no hum etc. Kenwood made the pinning such that the mic level winds up on a grounded/active twisted pair. No STP required. Smart eh! I agree with you that in many occasions, UTP is fine. Look at our ethernet networks: UPT up to 100Mbit. I also have first hand experience with UTP in a factory environment, in an RS-485 network. And probably this HDB2 is RS-485 too. But since the original cables from Raymarine have a shield, why not replace it with a shielded cable. Maybe the shield is used to keep the RS-485 tranceivers on the same ground level, to stay within the specs of the RS-485 chips (-7 to +12V max common mode). Meindert |
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