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San Leandro Commercial Broadband Strategy <br />17. Appendix F - Glossary <br />ADSL Asymmetric Digital Subscriber Line: DSL service with a larger <br />portion of the capacity devoted to downstream communications, <br />less to upstream. Typically thought of as a residential service. <br />ATM Asynchronous Transfer Mode: A data service offering by ASI, <br />that can be used for interconnection of customer's LAN. ATM <br />provides service from 1 Mbps to 145 Mbps utilizing Cell Relay <br />Packets. <br />Backhaul Connecting Internet access to a location over long or short <br />distances. Traditionally, wired networks have been necessary for <br />backhaul, but with 802.16, also known as WiMAX, backhaul via <br />wireless will become even more common than it is with WiFi. <br />Bandwidth The amount of data transmitted in a given amount of time; <br />usually measured in bits per second, kilobits per second, and <br />megabits per second. <br />Bit A single unit of data, either a one or a zero. In the world of <br />broadband, bits are used to refer to the amount of transmitted <br />data. A kilobit (Kb) is approximately 1,000 bits. A megabit (Mb) <br />is approximately 1,000,000 bits. <br />Broadband "Broadband" refers generally to any telecommunications service <br />capable of supporting digital data transmission at high speeds. <br />These services can include and /or support Internet, television, <br />telephone, private data networks and various specialized uses. <br />Broadband service can be delivered in a variety of ways, <br />including telephone lines (e.g. DSL), coaxial cable (e.g. cable <br />modem), fiber optic cable (e.g. Lit San Leandro), wireless <br />cellular /mobile service (e.g. cell phones, tablets, wireless <br />modems), WiFi, point -to -point and point -to- multipoint wireless <br />service (e.g. TelePacific, Etheric) and hybrid networks (XO <br />Communications). Although different organizations use <br />different criteria, the California Public Utilities Commission <br />considers 6 Mbps download and 1.5 Mbps upload speed to be a <br />standard for adequate broadband service availability. Unless <br />otherwise stated, this report uses the CPUC definition. <br />Byte The amount of memory space needed to store one character, <br />which is normally 8 bits. <br />16 July 2012 TellusVenture Associates Page 65 <br />