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Troubleshooting

This guide provides an overview of various internet access methods, including DSL types like ADSL, SDSL, and IDSL, detailing their features, speeds, and areas of use. It covers troubleshooting techniques for DSL, cable, satellite, and POTS access, addressing physical connections, configuration, and potential issues. Key points include maintaining hardware integrity, understanding signal quality, ensuring proper configuration, and environmental factors affecting performance. This comprehensive resource is essential for anyone looking to diagnose and resolve internet connectivity issues effectively.

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Troubleshooting

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  1. Troubleshooting Chapter 13 Lecture 2 Notes

  2. DSL Internet Access • Uses std. phone line • Limited service area

  3. ADSL • Asymmetric DSL • Most common • Different channels on one line • One – POTS (analog) • One – uploads 1 Mbps • One – downloads 8 Mbps

  4. SDSL • Same speed up and down 1.5 Mbps • Good for web hosting, intranets, e-commerce • Cannot share phone line

  5. IDSL • ISDN DSL • Symmetric • Used where SDSL and ADSL aren’t available • Rate: 144 Kbps

  6. RADSL & VHDSL • Two variations of asymmetric DSL • Rate Adaptive DSL • Modem modifies transmission speeds based on signal quality • Uploads max 1 Mbps • Downloads max 7 Mbps • Very High Bit DSL • Uses two wire pairs • Uploads 1.6 Mbps • Downloads 13 Mbps

  7. DSL Quality Factors • Location (distance from provider) • Security • Always on

  8. Troubleshooting DSL • Physical – cables • NIC (LED) • Drivers (NIC) • Protocol configuration • DSL LED • Call DSL provider

  9. Cable Access • Always on • Shares TV digital cable line • Requires cable modem • Coax connection  provider • UTP connection  PC/hub/switch

  10. Cable Troubleshooting • Physical – cables, hub • Switches, routers • Protocol configuration • Modem LED • Unplug/plug power to modem • Call cable provider

  11. One-way Home Satellite • Requires satellite card and dish • Outgoing - phone line • Incoming – satellite link • Asymmetric

  12. Two-way Home Satellite • Requires satellite card and dish • Outgoing – satellite link • Incoming – satellite link • Asymmetric

  13. Satellite Factors • Atmospheric conditions significantly affect performance. • Propagation time: .5 – 5 seconds • Line of site • Configuration is very precise • Troubleshooting • Call tech support

  14. Wireless Internet Access • Requirements • WAP • Service provider

  15. Wireless Factors • Environmental conditions • Fog • Electrical interference

  16. Troubleshooting - Wireless • Check configuration of wireless interface • Drivers • Protocols • Check the access area for dead spots • Check w/other users • Contact wireless provider

  17. POTS Access • Most popular method • Requirements: • Modem • ISP

  18. Troubleshooting POTS • Physical – cables • Check for dial tone • Check the phone number to the ISP • Call the ISP • Check for busy signal • Check username and password • Check connection settings • IP address (DHCP) • Has user exceeded allotted minutes? • Try connecting at lower speed • Disable call-waiting • Test with AT commands

  19. AT Commands • ATA – sets modem to auto-answer • ATH – hangs up • ATD – dials number • ATZ – resets modem • ATI3 – displays modem name and model #

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