3Com 3CR17561-91-US Getting Started Guide - Page 34
Placing Units On Top of Each Other, Increased Reliability
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34 CHAPTER 2: INSTALLING THE SWITCH network cable is required to provide both power and network connectivity. ■ Increased Reliability - a device powered by a PoE Switch will be able to take advantage of the facilities available to the Switch. The Switch can be fitted with a redundant power supply or uninterruptible power supply, increasing its uptime. The Switch supports resistor detection according to IEEE 802.3af and pre-standard detection methods. The Switch 4500 supports 3Com 802.3af equipment. For the latest list of supported devices, refer to the product page on the 3Com web site at http://www.3com.com/ For further information on Power over Ethernet, refer to the Power over Ethernet Configuration chapter in the Configuration Guide supplied on the CD-ROM that accompanies your Switch 4500. Power over Ethernet management is available using the web interface or the command line interface (CLI). Placing Units On Top of Each Other If the Switch units are free-standing, up to eight units can be placed one on top of the other. If you are mixing a variety of SuperStack® units, the smaller units must be positioned at the top. If you are placing Switch units one on top of the other, you must use the self-adhesive rubber feet supplied. Apply the feet to the underside of each Switch, sticking one in the marked area at each corner. Place the Switch units on top of each other, ensuring that the feet of the upper unit sit fully on the lower unit.