220V twisted pair

    A bit of randomly obtained extreme testing of network equipment.

    Initial configuration: approximately 40 meters of twisted pair cable between the computer and the server. On the one hand, a computer with a curved power supply that supplies 220 V (relative to ground) to all contacts. (i.e., the voltage between the contacts of the pair was correct, but each of them relative to the ground had a potential of ~ 200V). Until the moment when the enikeysch, who understood a junky computer, encircled it using the method “oh b # $ to # & @ in% & @ #!” the story of the periodic disappearance of the network lasted for more than a year, during which time quite a lot of iron was tried. It was complicated by the fact that the power supply did not immediately supply 220 to the case, so the initial measurements (somewhere on the third complaint about the loss of communication) showed nothing seditious.

    So, the equipment under test:

    • Intel Business Hub (4 ports) - stopped working after an hour or two, and did not work until it was turned on / off
    • Zyxel ES-2108 - burned port
    • Dlink DES-1005D - it burned out as a complete set (all ports stopped working).
    • Cisco 1750 - silently did the down port (as if there was no signal) until the hardware restarts

    19 "equipment :
    • 3COM 4200 - after a couple of days, turned off the port until the switch was completely de-energized (after turning the power off and on, the port came to life again)
    • 3COM 4200G - similarly turned off, but the port "came to its senses" within a day after disconnecting the cable
    • Allied Telesis Rapier AT24i - Ignored and Worked
    • Cisco 1841 with a card with switchports - ignored and worked
    • Edimax ES-3124RL - the only rack-mount port to burn itself

    I tried to find information about the "endurance" of the devices, but apparently, this is an abnormal mode of operation of the devices ...

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