Physical Layer Part 3
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1 Physical Layer Part 3 Transmission Media Networks: Transmission Media 1
2 Transmission Media Transmission medium:: the physical path between transmitter and receiver. Repeaters or amplifiers may be used to extend the length of the medium. Communication of electromagnetic waves is guided or unguided. Guided media :: waves are guided along a physical path (e.g, twisted pair, coaxial cable and optical fiber). Unguided media:: means for transmitting but not guiding electromagnetic waves (e.g., the atmosphere and outer space). Networks: Transmission Media 2
3 Transmission Media Choices Twisted pair Coaxial cable Optical fiber Wireless communications Networks: Transmission Media 3
4 Digital Transmission Media Bit Rates Copyright 2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Networks: Transmission Media 4
5 Twisted Pair Two insulated wires arranged in a spiral pattern. Copper or steel coated with copper. The signal is transmitted through one wire and a ground reference is transmitted in the other wire. Typically twisted pair is installed in building telephone wiring. Local loop connection to central telephone exchange is twisted pair. Networks: Transmission Media 5
6 Twisted Pair Limited in distance, bandwidth and data rate due to problems with attenuation, interference and noise. Issue: cross-talk due to interference from other signals. shielding wire (shielded twisted pair (STP)) with metallic braid or sheathing reduces interference. twisting reduces low-frequency interference and crosstalk. Networks: Transmission Media 6
7 Twisted Pair Fig 2-3. (a) Category 3 UTP. (b) Category 5 UTP. Networks: Transmission Media 7
8 UTP (Unshielded Twisted Pair) Category 3 corresponds to ordinary voice-grade twisted pair found in abundance in most office buildings. Category 5 (used for Fast Ethernet) is much more tightly twisted. Networks: Transmission Media 8
9 Digital Subscriber Line (DSL) [LG&W p.137] Telphone companies originally transmitted within the 0 to 4kHZ range to reduce crosstalk. Loading coils were added within the subscriber loop to provide a flatter transfer function to further improve voice transmission within the 3k HZ band while increasing attenuation at the higher frequencies. ADSL (Asymmetric Digital Subscriber Line) Uses existing twisted pair lines to provide higher bit rates that are possible with unloaded twisted pairs (i.e., there are no loading coils on the subscriber loop.) Networks: Transmission Media 9
10 ADSL asymmetric bidirectional digital transmisssions [higher frequencies] the network transmits downstream at speeds ranging from Mbps to 6.144Mbps users transmit upstream at speeds ranging from 64 kbps to 640 kbps 0 to 4kHZ used for conventional analog telephone signals Networks: Transmission Media 10
11 Digital Subscriber Lines Figure Operation of ADSL using discrete multitone modulation. Networks: Transmission Media 11
12 DSL ITU-T G992.1 ADSL standard uses Discrete Multitone (DMT) that divides the bandwidth into a large number of small subchannels. A splitter is required to separate voice signals from the data signal. The binary information is distributed among the subchannels. Each subchannel uses QAM. DMT adapts to line conditions by avoiding subchannels with poor SNR. Networks: Transmission Media 12
13 Digital Subscriber Lines Figure A typical ADSL equipment configuration. Networks: Transmission Media 13
14 10BASE-T 10 Mbps baseband transmission over twisted pair. Two Cat 3 cables, Manchester encoding, Maximum distance meters Ethernet hub Copyright 2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Figure 3.38 Networks: Transmission Media 14
15 Coaxial Cable Center conductor Dielectric material Braided outer conductor Outer cover Copyright 2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Figure 3.39 Networks: Transmission Media 15
16 Coaxial Cable Discussion divided into two basic categories for coax used in LANs: 50-ohm cable [baseband] 75-ohm cable [broadband or single channel baseband] In general, coaxial cable has better noise immunity for higher frequencies than twisted pair. Coaxial cable provides much higher bandwidth than twisted pair. However, the cable is bulky. Networks: Transmission Media 16
17 Baseband Coax 50-ohm cable is used exclusively for digital transmissions. Uses Manchester encoding, geographical limit is a few kilometers. 10Base5 Thick Ethernet :: thick (10 mm) coax 10 Mbps, 500 m. max segment length, 100 devices/segment, awkward to handle and install. 10Base2 Thin Ethernet :: thin (5 mm) coax 10 Mbps, 185 m. max segment length, 30 devices/segment, easier to handle, uses T-shaped connectors. Networks: Transmission Media 17
18 Broadband Coax 75-ohm cable (CATV system standard). Used for both analog and digital signaling. Analog signaling frequencies up to 500 MHZ are possible. When FDM used, referred to as broadband. For long-distance transmission of analog signals, amplifiers are needed every few kilometers. Networks: Transmission Media 18
19 Hybrid Fiber-Coaxial System Head end Upstream fiber Downstream fiber Fiber node Fiber Fiber node Fiber Coaxial distribution plant Bidirectional Split-Band Amplifier Copyright 2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Figure 3.42 Networks: Transmission Media 19
20 Optical Fiber Optical fiber :: a thin flexible medium capable of conducting optical rays. Optical fiber consists of a very fine cylinder of glass (core) surrounded by concentric layers of glass (cladding). a signal-encoded beam of light (a fluctuating beam) is transmitted by total internal reflection. Total internal reflection occurs in the core because it has a higher optical density (index of refraction) than the cladding. Attenuation in the fiber can be kept low by controlling the impurities in the glass. Networks: Transmission Media 20
21 Optical Fiber (a) Geometry of optical fiber light cladding jacket core (b) Reflection in optical fiber θ c Copyright 2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Figure 3.44 Networks: Transmission Media 21
22 Optical Fiber Lowest signal losses are for ultrapure fused silica but this is hard to manufacture. Optical fiber acts as a wavelength guide for frequencies in the range to HZ which covers the visible and part of the infrared spectrum. Three standard wavelengths : 850 nanometers (nm.), 1300 nm, 1500 nm. First-generation optical fiber :: 850 nm, 10 s Mbps using LED (light-emitting diode) sources. Second and third generation optical fiber :: 1300 and 1500 nm using ILD (injection laser diode) sources, gigabits/sec. Networks: Transmission Media 22
23 Optical Fiber Attenuation loss is lower at higher wavelengths. There are two types of detectors used at the receiving end to convert light into electrical energy (photo diodes): PIN detectors less expensive, less sensitive APD detectors ASK is commonly used to transmit digital data over optical fiber {referred to as intensity modulation}. Networks: Transmission Media 23
24 Optical Fiber Three techniques: Multimode step-index Multimode graded-index Single-mode step-index Presence of multiple paths differences in delay optical rays interfere with each other. A narrow core can create a single direct path which yields higher speeds. WDM (Wavelength Division Multiplexing) yields more available capacity. Networks: Transmission Media 24
25 (a) Multimode fiber: multiple rays follow different paths reflected path direct path (b) Single mode: only direct path propagates in fiber Copyright 2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Figure 3.46 Networks: Transmission Media 25
26 Electromagnetic Spectrum Frequency (Hz) AM radio FM radio & TV Cellular & PCS Wireless cable satellite & terrestrial microwave 10 4 LF MF HF VHF UHF SHF EHF Wavelength (meters) Copyright 2000 The McGraw Hill Companies Figure 3.48 Leon-Garcia & Widjaja: Communication Networks Networks: Transmission Media 26
27 The Electromagnetic Spectrum Figure The electromagnetic spectrum and its uses for communication. Networks: Transmission Media 27
28 Wireless LANs An application of omni-directional wireless communications to provide high-speed communications among a number of computers located in close proximity. In 1996 FCC in US announced its intentions to make 350 MHz of spectrum in the 5.15 to 5.35 GHz and to GHz bands available for unlicensed use in LAN applications. Networks: Transmission Media 28
Physical Layer Part 3
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Physical Layer Part 3
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