8.2.2 Designated critical critical 5 No loss of service even from Critical communications assets include, “Communications – “most asset service days at risk of (CCA) loss factor”. If severe” scenario for example: loss from communications failure. a = estimated # of days to restore 4 No loss of service from Police or armed forces communications – “most regular service area-wide probable” scenario systems b = % of critical assets affected 3 Loss factor of 1-25% from most Water and energy sensing systems – probable” scenario then CCA loss factor = a x b Traffic control systems … 2 Loss factor of 25-100% from – probable” scenario (Example 1.5 day’s loss of Communication towers, transmitters, “most – service for 10% of critical assets switches and nodal components of in city = loss factor of 15%; 3 1 Loss factor of 100-200% from public phone systems – days’ loss of service for 50% of probable” scenario “most critical assets in city = loss Data- and switching-centers routing factor of 150%) 0 Loss factor >200% from internet traffic. – “most probable” scenario Service may be provided either from the asset itself or via a designated alternative/back-up. 8.2.3 Cost of restoration. Likely cost of loss of service and 5 No loss of service. This assessment is designed to help establish – restoration of communications the return on investment from investing in system(s) as % of annual billed hardening the relevant infrastructure, in 4 - 10% of annual billed revenue revenue reducing the burden of restoring the city to normal life after a disaster. 3 10-15% – If a communications system does not have 2 15-25% – billed revenue (for example a private radio network), calculate cost to replace as % of 1 25-50% – initial installation cost of entire system. Use same thresholds as shown left. 0 - >50% of annual billed revenue. 8.3 Electricity 8.3.1 Customer service days energy loss factor”. 5 No loss of service even from Loss of service refers to service from the “Electrical – “most at risk of loss. If : severe” scenario main electricity supply. It excludes the use of back up generators. a = estimated # of days to restore 4 No loss of service even from – “most regular service area-wide probable” scenario
8.2.2 Designated critical asset service days at risk of loss from communications failure. “Communications critical (CCA) loss factor”. If a = estimated # of days to restore regular service area-wide b = % of critical assets affected … then CCA loss factor = a x b (Example – 1.5 day’s loss of service for 10% of critical assets in city = loss factor of 15%; 3 days’ loss of service for 50% of critical assets in city = loss factor of 150%) 5 – No loss of service even from “most severe” scenario 4 – No loss of service from “most probable” scenario 3 – Loss factor of 1-25% from most probable” scenario 2 – Loss factor of 25-100% from “most probable” scenario 1 – Loss factor of 100-200% from “most probable” scenario 0 – Loss factor >200% from “most probable” scenario Critical communications assets include, for example: Police or armed forces communications systems Water and energy sensing systems Traffic control systems Communication towers, transmitters, switches and nodal components of public phone systems Data- and switching-centers routing internet traffic. Service may be provided either from the asset itself or via a designated alternative/back-up. 8.2.3 Cost of restoration. Likely cost of loss of service and restoration of communications system(s) as % of annual billed revenue 5 – No loss of service. 4 - 10% of annual billed revenue 3 – 10-15% 2 – 15-25% 1 – 25-50% 0 - >50% of annual billed revenue. This assessment is designed to help establish the return on investment from investing in hardening the relevant infrastructure, in reducing the burden of restoring the city to normal life after a disaster. If a communications system does not have billed revenue (for example a private radio network), calculate cost to replace as % of initial installation cost of entire system. Use same thresholds as shown left. 8.3 Electricity 8.3.1 Customer service days at risk of loss. “Electrical energy loss factor”. If : a = estimated # of days to restore regular service area-wide 5 – No loss of service even from “most severe” scenario 4 – No loss of service even from “most probable” scenario Loss of service refers to service from the main electricity supply. It excludes the use of back up generators.