Cisco ESR10008 Hardware Installation Guide - Page 33

Chapter 2 Preparing for Installation Site Planning Table 2-4 Ethernet and Fast Ethernet Maximum Transmission Distances Signal Type 10BaseT Ethernet 100BaseT Fast Ethernet Transceiver Speed 10 Mbps 100 Mbps Cable Type Category 3 twisted-pair Category 5 twisted-pair Transmission Mode Full and half duplex Full and half duplex IEEE Maximum Distance Between Stations 328 ft (100 m) 328 ft (100 m) Setting Up Fiber-Optic Connections For other fiber-optic specifications, see the Cisco 10000 Series Routers Line Card Hardware Installation Guide. Interference Considerations When wires are run for any significant distance, there is a risk that stray signals will be induced on the wires as interference. If interference signals are strong, they can cause data errors or damage to the equipment. The following sections describe sources of interference and how to minimize its effects on the Cisco 10008 router. Electromagnetic Interference All equipment powered by AC current can propagate electrical energy that can cause electromagnetic interference (EMI) and possibly affect the operation of other equipment. The typical sources of EMI are equipment power cords and power service cables from electric utility companies. Strong EMI can destroy the signal drivers and receivers in the Cisco 10008 router and even create an electrical hazard by causing power surges through power lines into installed equipment. These problems are rare, but could be catastrophic. To resolve these problems, you need specialized knowledge and equipment, which could consume substantial time and money. However, you should ensure that you have a properly grounded and shielded electrical environment, paying special attention to the need for electrical surge suppression. Radio Frequency Interference When electromagnetic fields act over a long distance, radio frequency interference (RFI) can be propagated. Building wiring can often act as an antenna, receiving the RFI signals and creating more EMI on the wiring. If you use twisted-pair cable in your plant wiring with a good distribution of grounding conductors, the plant wiring is unlikely to emit radio interference. If you exceed the recommended distances, use a high-quality twisted-pair cable with one ground conductor for each data signal. Lightning and AC Power Fault Interference If signal wires exceed recommended cabling distances, or if signal wires pass between buildings, you should consider the effect that a lightning strike in your vicinity might have on the Cisco 10008 router. OL-0659-13 Cisco 10008 Router Hardware Installation Guide 2-7