3Com 5500-EI Getting Started Guide - Page 44
Choosing the Correct Cables
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UPC - 662705498997
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44 CHAPTER 2: INSTALLING THE SWITCH Table 17 Unit Status Colors Color Green Green flashing Red Off State The switch is powered-up and operating normally. The Power On Self Test (POST) is in process, or software is downloading. The switch has failed its Power On Self Test (POST). The switch is not receiving power. If you encounter a problem, see the section entitled "Solving Problems Indicated by LEDs" on page 82 for a list of suggested solutions. CAUTION: The switch has no ON/OFF switch; the only method of connecting or disconnecting mains power is by connecting or disconnecting the power cord. Choosing the Correct Cables All of the ports on the switch are Auto-MDIX, that is, they have a cross-over capability. These ports can automatically detect whether to operate in MDI or MDIX mode. Therefore, you can make a connection to one of the ports with a straight-through (MDI) or a cross-over (MDIX) cable. The Auto-MDIX feature only operates with auto-negotiation enabled. If auto-negotiation is disabled, all the switch ports are configured as MDIX (cross-over). If you want to make a connection to another MDIX port, you need a cross-over cable. Many ports on workstations and servers are configured as MDI (straight-through). If you want to make a connection to an MDI port, you need to use a standard straight-through cable. See Table 18. 3Com recommends that you use at least Category 5 twisted pair cable. The maximum segment length for this type of cable is 100 m (328 ft.).
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