ISP Information:
This refers to the distance of 1.75" between screw holes in a rack used to hold server equipment. Most computer equipment racks are between 24 and 42 rack units in height. If you are shopping for rack equipment, keep in mind the height of the rack you have to work with and the "U" rating of the equipment. Heights of 1U indicate equipment that can fit into a 1.75" tall rack space, and 2U would indicate twice that at 3.5",
ISP Glossary:
Rack Units - Agreement Covers Wi-Fi at Denver International, PhiladelphiaInternational and San Francisco International AirportsBELLEVUE, Wash. and REDMOND, Wash., Feb. 5 /PRNewswire-FirstCall/ --Driving expanded Wi-Fi (802.11b) service coverage at the nation'sairports, T-Mobile USA, Inc. and AT&T Wireless (NYSE:AWE) todayannounced a reciprocal Wi-Fi roaming agreement for DenverInternational (DIA), Philadelphia International (PHL) and SanFrancisco International (SFO) airports. Today's announcement marksthe first roaming agreement between AT&T Wireless and T-Mobile forWi-Fi service.As a result of this roaming agreement, T-Mobile HotSpot subscriberscan soon add DIA and PHL to the list of hotspot locations available tothem to stay connected to the Internet, access their corporatenetworks, or check e-mail via a Wi-Fi enabled laptop or PDA. For AT&TWireless Wi-Fi customers, the roaming agreement means they will beable to use their Wi-Fi device throughout the public areas of SFO.The companies' respective customers will be able to roam using theirexisting user ID and password.- http://finance.lycos.com/home/news/story.asp?story=40441795
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