1. CIT 307 Online Data Communications Transmission Media Module 7 Kevin Siminski, Instructor

2. Transmission Media and Layer 1

3. Classes of Media

4. Guided Media types Twisted Pair Cable Coaxial Cable Fiber-Optic Cable

5. Twisted Pair Why the twist??

6. Twisted Pair (continued) UTP and STP

7. Categories of UTP CategoryBandwidthData RateDigital/AnalogUse 1very low< 100 kbpsAnalogTelephone 2 < 2 MHz2 MbpsAnalog/digitalT-1 lines 3 16 MHz 10 MbpsDigitalLANs 4 20 MHz 20 MbpsDigitalLANs 5 100 MHz 100 MbpsDigitalLANs 6 (draft) 200 MHz 200 MbpsDigitalLANs 7 (draft) 600 MHz 600 MbpsDigitalLANs

8. UTP Connectors

9. UTP Performance

10. Coaxial Cable

11. Types of Coaxial Cable CategoryImpedanceUse RG-59 75  Cable TV RG-58 50  Thin Ethernet RG-11 50  Thick Ethernet

12. Coaxial Connectors

13. Coaxial Performance

14. Fiber Optic Cables Use either LED (Light Emitting Diode) or Laser transmitter Can be expensive to terminate cables. Time consuming Delicate

15. Fiber Optics

16. Fiber Optic types/modes

17. Modes of operation

18. Fiber types TypeCoreCladdingMode 50/125 50125Multimode, graded-index 62.5/125 62.5125Multimode, graded-index 100/125100125Multimode, graded-index 7/125 7125Single-mode

19. Fiber Construction

20. Fiber Optic connectors

21. Fiber Optic Performance

22. Other Fiber Optic tid-bits Single Mode Fiber 99% of the time uses a laser for transmission. – Cable color is usually Yellow Multimode Fiber uses a LED for transmission – Cable color is usually Orange