CIT 307 OnlineData Communications

Transmission MediaTransmission Media

Module 7 Module 7 Kevin Siminski, InstructorKevin Siminski, Instructor

Transmission Media and Layer 1

Classes of Media

Guided Media types

Twisted Pair Cable Coaxial Cable Fiber-Optic Cable

Twisted Pair

Why the twist??

Twisted Pair (continued)

UTP and STP

Categories of UTP

Category Bandwidth Data Rate Digital/Analog Use

1 very low < 100 kbps Analog Telephone

2 < 2 MHz 2 Mbps Analog/digital T-1 lines

3 16 MHz 10 Mbps Digital LANs

4 20 MHz 20 Mbps Digital LANs

5 100 MHz 100 Mbps Digital LANs

6 (draft) 200 MHz 200 Mbps Digital LANs

7 (draft) 600 MHz 600 Mbps Digital LANs

UTP Connectors

UTP Performance

Coaxial Cable

Types of Coaxial Cable

Category Impedance Use

RG-59RG-59 75 Cable TV

RG-58RG-58 50 Thin Ethernet

RG-11RG-11 50 Thick Ethernet

Coaxial Connectors

Coaxial Performance

Fiber Optic Cables

Use either LED (Light Emitting Diode) or Laser transmitter

Can be expensive to terminate cables. Time consuming Delicate

Fiber Optics

Fiber Optic types/modes

Modes of operation

Fiber types

Type Core Cladding Mode

50/12550/125 50 125 Multimode, graded-index

62.5/12562.5/125 62.5 125 Multimode, graded-index

100/125100/125 100 125 Multimode, graded-index

7/1257/125 7 125 Single-mode

Fiber Construction

Fiber Optic connectors

Fiber Optic Performance

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