 waves. Radio waves carry signals as electrical energy on unseen waves. SSAD (Solid State Drive) Contains integrated circuits that store memory. SSDs are for the most part used as non-volatile storage where data is not lost in power outages. SSL (Secure Sockets Layer) A newer type of security for VPNs than IPsec. It is embedded in browsers SO that organizations aren't required to install special client software in each user's computer. statistical multiplexing Assumes that not all devices are active all the time. A statistical multiplexer does not save capacity for each device connected to it. It operates either on a first-come, first-served basis or on a priority basis in which certain streams of traffic have higher priority than others. streaming video and audio A means of starting to play a message while the rest of it is being received. Streaming uses compression to make the voice, video, and data files smaller SO that they can be transmitted in less time. Streaming video and audio is used in broadcasting video and audio over the Internet. www.TechnicalPDF.com switching Equipment with input and output ports that transmits traffic and sets up paths to destinations based on digits dialed or addressing bits. T.120 The ITU-defined standard for document sharing and white boarding. People using T.120-adherent software can participate in document-sharing conferences with one another over the Internet. For example, vendors can demonstrate their products to potential customers via computers connected to the Internet at dispersed sites. A North American and Japanese standard for communicating at 1.54Mbps. A T1 line has the capacity for 24 voice or data channels. A North American standard for communicating at speeds of 44Mbps. T3 lines have 672 channels for voice and/or data. Fiber-optic cabling or digital microwave is required for T3 transmissions. tandem offices Used in the core of traditional, traditional Public Switched Telephone Networks (PSTNs). Tandem central offices switch traffic between central offices. End us