Space from the LRDP: Now: Residential 2.0 M GSF Acad+support 2.8 M GSF ----- 4.8 M 2020: Residential 3.2 M GSF Acad+support 4.8 M GSF ------ 8.0 M Basic Internet access needs -80 dBm of RF signal Full Internet access requires -80 dBm of RF signal VoIP wifi coverage requires -65 dBm Coverage per AP Open office Small rooms Residential steel pan strips VoIP grad service 2500 SF 2500 SF 2000 SF Full internet access 5000 SF 4000 SF 2500 SF Basic internet access 10000 SF 8000 SF 5000 SF Russ' 50 ft rule APs at every position 2000 SF APs at every other position 8000 SF Examples of over subscription ratios that drive AP density Best effort service 60:1 Web and email 40:1 Production file transfer (YouTube) 10:1 Wireless VoIP 8:1 Sporadic video download 5:1 Unbuffered video streaming 1:1 Assumptions: nothing stupid, so 1. no foil on insulation in interior walls 2. no leaky microwave ovens 3. no ISM band cordless phones, baby monitors, etc 4. "Residential steel pan strips" -- Residential buildings tend to be about 40 ft wide which "wastes" available range of AP radios located in the corridor -- reducing covered area by 2X because half the coverage circle is outside the bldg envelope. The steel-pan assumption is that there is no coverage from one floor to the next. This will be a worst-case assumption for coverage. 5. All new construction will include wiring for APs. Existing space will need new jacks estimated at our standard rate. This assumes new wireless jacks will be "all new" and not stolen room outlets. For Full Internet Access: Assumed average background noise and interference -95 dBm Access Point Transmit Power 30 mW AP antenna gain 2.2 dBi AP Connector loss (integrated antenna) 0 dB AP EIRP 16.8 dBm (48 mW) Client Device transmit power 30 mW Client antenna gain 2.2 dBi Client connector loss (integrated antenna) 0 dB Client EIRP 16.8 dBm (48 mW) RSSI minimum -80 dBm Signal-to-Noise ratio 15 dB Min modulation rate 11/12 Mb/s Coverage Cell overlap boundry -77 dBm Fade Margin 10 dB For Voice-over-IP, all is the same except: RSSI minimum -65 dBm Signal-to-Noise ratio 25 dB Min modulation rate 54 Mb/s Coverage Cell overlap boundry -62 dBm Fade Margin 10 dB ============== Notes: WiFi will convert from 2.5 GHz to 5 GHz when it switches from 802.11g to 802.11n. While penetration of interior sheetrock walls will remain good, concrete floors will be somewhat more opaque. We need to get it into our standards that interior walls should not have metal foil on insulation. We also want to limit metalic coatings on windows to south facing glass. This has more to do with cell phone coverage. The FCC prevents us from making spectrum utilization rules in the campus residential areas. We can make rules for our employees. 802.11g 802.11n 802.11n wap old space new space WAP $450 650 650 wap-power 100 100 100 jack 300 591 - central controller 150 100 WISM 100 30 router slot 30 install (labor) 100 138 138 coverage survey (helium) 100 WCS (no location) 50 45 45 WCS (w/location) +25 25 35 ----- ----- ----- $1250 $1679 $1070 Existing Academic+Admin space: 2.8 M GSF 700 APs Existing Resnet space: 2.0 M GSF 800 APs LRDP addition A+A space: 2.0 M GSF 500 APs LRDP additional Resnet space: 1.2 M GSF 480 APs Wiring already in place $175,000 Total = $3.4M