agenda 1. quiz 2. homework last class 3. homework next class 4. transmission mathematics a. dbs,...
TRANSCRIPT
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Agenda
1. QUIZ 2. HOMEWORK LAST CLASS 3. HOMEWORK NEXT CLASS 4. TRANSMISSION MATHEMATICS
a. dBs, NYQUIST & SHANNON b. NOISE 5. DIGITAL SYSTEMS 6. ANALOG AND ANALOG TO DIGITAL CONVERSIONS 7. ISDN 8. DSL
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Homework
Chapter 4: 10, 11, 12, 14, 15, 16, 22, 50, 54, 63
Chapter 5: 1, 3, 6, 7, 9, 14, 17, 32
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Decibells & Logarithms
Converting watts to dB (or milliwatts to dBm): 10 log10 1000 watts = 30 dBw
Converting dB to watts (or dBm to milliwatts):30 dBw = log-1, or log-1 (3) or 10 raised
to the 3rd power = 103 = 1000 watts
35 dBw = 103.5 = 3162.3 watts
Note: There’s a point between the 3 & 5.
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Decibells & Logarithms
dBW Watts -3 .5 0 1 3 2 6 4 9 8 10 10 20 100 30 1000 40 10000
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Nyquist1. Nyquist: The maximum practical data rate (samples) per channel.
Max R = 2 H log2 V
Logarithmic function to the base 2: For each # V, log V = the exponent to which 2 must be raised to produce V. Then if V = 16, the log2 of V = 4. If V = 2, the log2 of V = 1.
Then what is the maximum practical data rate for BPSK signal on a line with a bandwidth of 3000 Hz?
What is the maximum practical data rate for a QPSK signal on a line with a bandwidth of 3000 Hz?
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Shannon
Shannon: The maximum theoretical data rate per channel.
Max R = CBW x log2 (1 + S/N)
[CBW = H in Nyquist Theorem]
Then what is the maximum practical data rate for signal with a 30 dB S/N on a line with a bandwidth of 3000 Hz?
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Noise
N = Noise Power = kTB, where B is bandwidth.(Used in Shannon’s Limit)
No = Noise Density = kT, where k is Boltzmann’s Constant (-228.6 dBw)
(Used in Carrier to Noise ratios, i.e., C/No)
T = SNT = System Noise Temperature(Used in radio and satellite linkequations, e.g., G/T is a measure of quality in satellite link equations.)
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Chapter 4
Signals
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Figure 4-1
Comparison of Analog and Digital Signals
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Figure 4-2
Example of Periodic Signal
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Figure 4-3
Example of Aperiodic Signal
Aperiodic signals are _____________?Inconsistant
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Figure 4-4
A Sine Wave
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Figure 4-5
Amplitude
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Figure 4-6
Period and Frequency
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Figure 4-7
Relationship between Different Phases
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Figure 4-8
Amplitude Change
Amplitude relates to ___________?S in S/N
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Figure 4-10
Phase Change
Phase shift relates to ______________?Phase shift keying
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Figure 4-11
Time and Frequency Domains
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Figure 4-12 Time and Frequency Domains for Different Signals
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Figure 4-13
A Signal with a DC Component
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Figure 4-14
Composite Waveform
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Figure 4-15
Bandwidth
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Figure 4-16
Example 4.8
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Figure 4-17
Example 4.9
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Figure 4-19
Bit Rate and Bit Interval
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Figure 4-20
Harmonics of a Digital Signal
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Figure 4-21
Exact and Significant Spectrum
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Chapter 5
Encoding
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Figure 5-3
Types of Digital to Digital Encoding
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Figure 5-5
Types of Polar Encoding
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Figure 5-6
NRZ-L and NRZ-I Encoding
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Figure 5-7
RZ Encoding
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Figure 5-8Manchester and Diff. Manchester Encoding
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Figure 5-9
Types of Bipolar Encoding
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Figure 5-10
Bipolar AMI Encoding
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Figure 5-15
Analog to Digital Conversion
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Figure 5-16
PAM
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Figure 5-17
Quantized PAM Signal
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Figure 5-19
PCM
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Figure 5-20
From Analog Signal to PCM Digital Code
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Figure 5-21
Nyquist Theorem
This assumes what?
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Figure 5-27
FSK
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Figure 5-28
Baud Rate and Bandwidth in FSK
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Figure 5-29
PSK
Why do you think PSK is better than FSK?Needs less power per bit
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Figure 5-30
PSK Constellation
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Figure 5-31
4-PSK
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Figure 5-32
4-PSK Characteristics
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Figure 5-338-PSK Characteristics
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Figure 5-34
Baud Rate and Bandwidth in PSK
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Figure 5-35
4-QAM and 8-QAM Constellations
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Figure 5-44
Frequency Modulation
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Figure 5-45
FM Bandwidth
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Integrated Services Digital Network (ISDN) Standard
1. A major TELCO attempt to integrate voice and non-voice services.2. Integrated multiple channels interleaved with time division multiplexing.
A - 4 KHz analog telephone channelB - 64 Kbps digital PCM channel for voice or dataC - 8 or 16 Kbps digital channelD - 16 Kbps digital channel for out of band signallingE - 64 Kbps channel for internal ISDN signallingH - 384, 1536, or 1920 Kbps digital channel
Basic Rate = 2B + 1D (the nominal 128 frequently used in homes)Primary Rate = 23 B + 1D
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Integrated Services Digital Network (ISDN) Standard
TE 1 ISDN Terminal
TE 1 ISDN Telephone
Non-ISDN Terminal
TA
S
S
S
R
ISDN PBX
NT1 ISDNExchange
T U
R, S, T & U are CCITT defined reference PointsTA is terminal adapter
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Digital Subscriber Line (DSL) Standard
Drivers:• ISDN didn’t capture significant market share for TELCOs• Higher speed applications require new technologies• Users want to stay connected longer• High cost of converting infrastructure• Telephone lines weren’t designed to provide simultaneous digital and analog services• Competition from satellite (e.g., DirectTV/Direct PC) & cable industry
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Digital Subscriber Line (DSL) Standard Services
Type DSL SpeedAsymmetric DSL 1.5 to 8 Mbps to user
16 to 640 Kbps to networkHigh-data-rate DSL 1.544 Mbps to and from userSingle-line DSL 768 Kbps full duplex on a pairRate-adaptive DSL 1.5 to 8 Mbps to user
16 to 640 Kbps to network(can adjust speeds)
Consumer DSL 1 Mbps to user16 to 128 Kbps to network(does not include splitter)
ISDN DSL Basic ISDN rateVery-high-data-rate DSL 13 to 52 Mbps to user
1.5 to 6 Mbps to network
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DSL Rates (using 24 gauge wire)
Connection Max Data Rate Distance LimitADSL 1.5-8 Mbps downstream 12-18 K feet
Up to 1.544 Mbps upstream
HDSL T1 - 1.544 Mbps (4 wire) 12,000 feet
IDSL 144 Kbps (symmetric) 18,000 feet (36 w rptr)
SDSL T1 - 1.544 Mbps (2 wire) 11,000 feet
VDSL 13-52 Mbps downstream 1-4.5 K feet 1.5-2.3 Mbps upstream Up to 34 Mbps Symmetric
R-ADSL 1.5-8 Mbps downstream 12-18 K feet Up to 1.544 Mbps upstream
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DSL Network Configuration
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Asymmetric DSL
Characteristics • Uses frequency division multiplex occupying spectrum above voice• Principal modulation scheme is Discrete multitone (DMT), a quadrature amplitude modulation coding technique developed by Bell Labs (ANSI T1.413 standard)• Can be mapped into higher layer protocol mechanisms that can include IP frames or ATM cells• Can interface to Simple Network Management Protocol (SNMP) for operations, administration and management
0-4 KHz 25KHz 200KHz 1.1MHz
To Network To User
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Cable Modem DSL Access
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Serving CO
Who Fixes The Network?
Hub office
DSLAM
ADM
DWDM
Internet
DWDM
ATMNetwork
VerizonILEC Verizon ILEC
Worldcom
VerizonAdvanced
Data Verizon Advanced Data
VerizonAdvanced
Data
AOL
AOL
ADM
ADM
ADM
LEC NAP LEC NAP
BackboneNAPNSPApplicatione-business
Content Provider
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Providers Ask Two Pivotal Questions
Is the network service up Is the network service up
and running properly?and running properly?
If it’s not, where’s the If it’s not, where’s the problemproblem
and how do we fix itand how do we fix it??
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LEC
The Answer...
Providers must tightly link their operations with their trading trading partnerspartners through integratedintegrated service assurance service assurance
NAP
NSP
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Service Assurance Market
Test & Measurement
Test & Measurement
OperationsSupportSystems
OperationsSupportSystems
Service AssuranceService AssuranceService AssuranceService Assurance
• $3.5B* in 2000$8.4B* in 2004
• Growing at 25%
• Includes OSS software, services, and remote probes
• Key players: Spirent Communications, Telcordia, Lucent, Acterna (TTC/WWG), Micromuse
* RHK Estimates
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Service Assurance Activities
Monitor SLAsMonitor SLAs
ReportReport
Allocate ResourcesAllocate Resources
Determine SLA ViolationsDetermine SLA Violations
TestTest
Isolate Root CauseIsolate Root Cause
Detect Alarms/EventsDetect Alarms/Events
Detect Performance/Traffic ProblemsDetect Performance/Traffic Problems
Decide RepairDecide Repair
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Network “Communication” is Key
Need to provide service information within and between networks
LEC
NAP
NSP