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Client Name: City of Santa Ana I AMI FEASIBILITY REPORT <br />are transmitted to the AMI HES through the network at preprogrammed times, usually 4 to 6 times <br />per day. This is accomplished by the MTU attached to the meter that transmits the meter readings <br />and associated data to the network data collection units (DCUs). The DCUs transmit all data to the <br />AMI HES on a preset schedule. Figure 5 provides a diagram of an AMI system showing the water <br />meters and MTUs connected across the network to the head -end data collection system. MDMS is <br />also shown, as the vast quantity of data collected by AMI systems (along with the value of managing <br />and maintaining this data) make MDMS a common addition to most AMI solutions. <br />ADVANCED METERING INFRASTRUCTURE (AMI) <br />nafn <br />Smart <br />Smart Meters—! Mesh 1 i Backhaul AMI MDMS �� Enterprise Integration <br />(waterAMi Meterl� �� Network{ (WAN) HES _ to Utility Systems <br />Advanced Metering Infrastructure ,------------� <br />i- - - - — - - <br />Figure 5 Conceptual AMI Solution Illustration <br />There are several common network structures in use today. The selection of a network type is <br />dependent upon several factors in the service area of the water utility. The proximity of the meters <br />to each other, the uniformity of the service territory, the physical location of meter assets (indoors, <br />pits, etc.,), availability of utility assets, and the topography of the service area help to determine the <br />quantity of DCUs required for a reliable network. It is imperative that the network selected has <br />sufficient robustness, throughput, and redundancies to meet the service level performance <br />required. <br />Fixed network AMI is a term used to reflect that the network is permanently installed to capture <br />meter readings. This method can consist of a series of antennas, towers, collectors, repeaters, or <br />other permanently installed infrastructure. The infrastructure provides a way to collect <br />transmission of meter readings from AMI -enabled meters or other smart devices and sending data <br />to a central computer without field personnel required to collect it. The exact composition of the <br />fixed network will depend on the vendor and technology chosen. <br />BLACK & VEATCH I Smart Metering Technology <br />25G-137 <br />19 <br />