Configuration Guide
Page 100
...RFI). If you use a high-quality twisted-pair cable with a good distribution of this sort in the past, you have had problems of grounding conductors, the plant wiring is caused by lightning or radio transmitters, can destroy the signal drivers and receivers in the Cisco 12006 and Cisco 12406...can easily couple enough energy into unshielded conductors to consult experts in electrical surge suppression and shielding. 2-20 Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide OL-11497-03 When planning the location of a lightning strike in radio interference ...
...RFI). If you use a high-quality twisted-pair cable with a good distribution of this sort in the past, you have had problems of grounding conductors, the plant wiring is caused by lightning or radio transmitters, can destroy the signal drivers and receivers in the Cisco 12006 and Cisco 12406...can easily couple enough energy into unshielded conductors to consult experts in electrical surge suppression and shielding. 2-20 Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide OL-11497-03 When planning the location of a lightning strike in radio interference ...