 (DSL): consumers, television. 128Kbps to 44Mbps small and mid- size businesses Remote access to where fiber to corporate files and e- premises not mail. available Telecommuters Carrier Gigabit Mid-size to Access to the Internet, Ethernet 1Mbps to large connections to storage 10Gbps over fiber commercial area networks, and customers LAN-to-LAN connections; data only. Carrier networks and To aggregate traffic in cable TV core metropolitan networks and send it as a single metropolitan stream to central offices networks or cable headends. Asynchronous Telephone Not suited to today's Transfer Mode companies capacity requirements. (ATM): Up to Transmits voice, video, 2.5Gbps and data traffic. Rarely used because ATM switches are required. Table 5-3 Digital Signal Levels-These Services are Being Replaced by Higher-Capacity Carrier Ethernet www.TechnicalPDF.com North America Japan Europe Chan. Chan. Chan. 64Kbps 64Kbps 64Kbps T1 (DS- 1.544Mb 1.544Mb 2.048Mbp T2 (DS- 6.312Mb 6.312Mb 8.448Mbp T3 (DS- 44.7Mb 32.06Mb 34.368Mb Table 5-4 Digital Subscriber Line Standards Digital Upstream Subscriber Line Top Data Downstream Service Top Data Rate Offered to residential (Asymmetric customers. Uses one pair of wires. ADSL2 Most common standard worldwide for Internet access. ADSL2+ Supports video on demand on short cable runs. ADSL2-Reach Increases reach of ADSL2+. extended www.TechnicalPDF.com SHDSL- Single or two pair. Two pair Symmetric speeds higher than single High-Data Rate pair. VDSL (Very- High-Bit-Rate VDSL2-12MHz Requires short cable length; TV/data/voice. VDSL2-30MHz Requires short cable length; TV/data/voice. www.TechnicalPDF.com Part IV. The Internet and Cellular Networks Chapter 6 The Internet Chapter 7 Mobile and Wi-Fi Networks www.TechnicalPDF.com Plazn ivelessonsic VIDEO TRAINING FOR THE IT PROFESSIONAL 0, LEARN QUICKLY Video otraining anteachmorein WATCH AND LEARN TESTYOURSELF Our Complete Video Courses offer self-assessment quizzesthroughout CONVENIENT Most videos are streaming with an option to download lessons