Phones: Cisco 7940 IP phones\nSwitches: Catalyst 3550\n\n\nBasic problem: If a IP phone is shocked with static electricity the\ncisco switch will stop providing inline power.\n\n\nDetailed problem:\nOur IP phones are powered via inline power from the switch. If\nsomebody shocks their phone the static electricity will shutdown the\nport the phone is connected to along with up to 4 adjacent ports. When\nthis happens if you check the IOS it shows the following:\n\nFastEthernet0/18 is down, line protocol is down (notconnect)\n\n\nIf you plug in a computer the port becomes active, but it will not\nrecognize when a phone is plugged in. In other words, if the device\nrequires inline power the switch will not recognize that the cable is\nplugged in. The ports will come back and power the phones again after\n0.5-4 hours. All of our racks are grounded.