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2.→In communications theory, the signal-to-noise ratio (SNR) is defined as the ratio of the power of a signal (meaningful information) to the power of the background noise, that is,.. Psignal SNR = ··.·The SNR is usually measured in decibels. In the case of a cable modem, it is↓ P noise a measure of the signal strength to and from the modem relative to the background noise. The ideal SNR range is 30 to 50 decibels (dB). High noise or low signal power levels reduce the SNR and can negatively affect internet connectivity, resulting in data loss or slow speeds.↓ ↓ Home cable modems have a web interface at an internal LAN address such as 192.168.100.1 which gives the status of various modem parameters. For example, part of the status page of a modem at a given moment (a snapshot) is shown below.↓ a) For Channel 12 in the table, the SNR is given in decibels. What is actual signal to noise power ratio?↓ b) For the same channel, assume that the resistances R, and Ro are equal. Then the voltage gain of the received signal is given in absolute decibel units. What is the actual voltage-being. received by the modem in microvolts? (See the slides). Downstream Bonded Channels Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected 1 Locked QAM256 13 615.0 -2.9 37.8 0 0 2 Locked QAM256 9 591.0 -2.5 38.4 0 0 3 Locked QAM256 10 597.0 -2.5 38.4 0 0 4 Locked QAM256 11 603.0 -2.5 38.3 0 0 5 Locked QAM256 12 609.0 -2.6 38.2 0 0 6 Locked QAM256 14 621.0 -3.3 37.5 1 0 7 Locked QAM256 15 627.0 -3.3 37.4 0 0 8 Locked QAM256 16 633.0 -3.1 37.5 0 0 9 Locked QAM256 17 639.0 -3.1 37.5 0 0 10 Locked QAM256 18 645.0 -3.3 37.4 0 0 11 Locked QAM256 19 651.0 -3.4 37.4 0 0 12 Locked QAM256 20 657.0 -3.5 37.4 0 0 13 Locked QAM256 21 663.0 -3.7 37.3 0 0 14 Locked QAM256 15 Locked QAM256 16 Locked QAM256 222 22 669.0 -3.9 37.2 0 0 23 675.0 -4.0 36.6 0 0 24 681.0 -4.1 37.1 0 0 Total 1 0

2.→In communications theory, the signal-to-noise ratio (SNR) is defined as the ratio of the power of a signal (meaningful information) to the power of the background noise, that is,.. Psignal SNR = ··.·The SNR is usually measured in decibels. In the case of a cable modem, it is↓ P noise a measure of the signal strength to and from the modem relative to the background noise. The ideal SNR range is 30 to 50 decibels (dB). High noise or low signal power levels reduce the SNR and can negatively affect internet connectivity, resulting in data loss or slow speeds.↓ ↓ Home cable modems have a web interface at an internal LAN address such as 192.168.100.1 which gives the status of various modem parameters. For example, part of the status page of a modem at a given moment (a snapshot) is shown below.↓ a) For Channel 12 in the table, the SNR is given in decibels. What is actual signal to noise power ratio?↓ b) For the same channel, assume that the resistances R, and Ro are equal. Then the voltage gain of the received signal is given in absolute decibel units. What is the actual voltage-being. received by the modem in microvolts? (See the slides). Downstream Bonded Channels Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected 1 Locked QAM256 13 615.0 -2.9 37.8 0 0 2 Locked QAM256 9 591.0 -2.5 38.4 0 0 3 Locked QAM256 10 597.0 -2.5 38.4 0 0 4 Locked QAM256 11 603.0 -2.5 38.3 0 0 5 Locked QAM256 12 609.0 -2.6 38.2 0 0 6 Locked QAM256 14 621.0 -3.3 37.5 1 0 7 Locked QAM256 15 627.0 -3.3 37.4 0 0 8 Locked QAM256 16 633.0 -3.1 37.5 0 0 9 Locked QAM256 17 639.0 -3.1 37.5 0 0 10 Locked QAM256 18 645.0 -3.3 37.4 0 0 11 Locked QAM256 19 651.0 -3.4 37.4 0 0 12 Locked QAM256 20 657.0 -3.5 37.4 0 0 13 Locked QAM256 21 663.0 -3.7 37.3 0 0 14 Locked QAM256 15 Locked QAM256 16 Locked QAM256 222 22 669.0 -3.9 37.2 0 0 23 675.0 -4.0 36.6 0 0 24 681.0 -4.1 37.1 0 0 Total 1 0

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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2.→In communications theory, the signal-to-noise ratio (SNR) is defined as the ratio of the power of a signal (meaningful information) to the power of the background noise, that is,.. Psignal SNR = ··.·The SNR is usually measured in decibels. In the case of a cable modem, it is↓ P noise a measure of the signal strength to and from the modem relative to the background noise. The ideal SNR range is 30 to 50 decibels (dB). High noise or low signal power levels reduce the SNR and can negatively affect internet connectivity, resulting in data loss or slow speeds.↓ ↓ Home cable modems have a web interface at an internal LAN address such as 192.168.100.1 which gives the status of various modem parameters. For example, part of the status page of a modem at a given moment (a snapshot) is shown below.↓ a) For Channel 12 in the table, the SNR is given in decibels. What is actual signal to noise power ratio?↓ b) For the same channel, assume that the resistances R, and Ro are equal. Then the voltage gain of the received signal is given in absolute decibel units. What is the actual voltage-being. received by the modem in microvolts? (See the slides).
Transcribed Image Text:2.→In communications theory, the signal-to-noise ratio (SNR) is defined as the ratio of the power of a signal (meaningful information) to the power of the background noise, that is,.. Psignal SNR = ··.·The SNR is usually measured in decibels. In the case of a cable modem, it is↓ P noise a measure of the signal strength to and from the modem relative to the background noise. The ideal SNR range is 30 to 50 decibels (dB). High noise or low signal power levels reduce the SNR and can negatively affect internet connectivity, resulting in data loss or slow speeds.↓ ↓ Home cable modems have a web interface at an internal LAN address such as 192.168.100.1 which gives the status of various modem parameters. For example, part of the status page of a modem at a given moment (a snapshot) is shown below.↓ a) For Channel 12 in the table, the SNR is given in decibels. What is actual signal to noise power ratio?↓ b) For the same channel, assume that the resistances R, and Ro are equal. Then the voltage gain of the received signal is given in absolute decibel units. What is the actual voltage-being. received by the modem in microvolts? (See the slides).
Downstream Bonded Channels Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected 1 Locked QAM256 13 615.0 -2.9 37.8 0 0 2 Locked QAM256 9 591.0 -2.5 38.4 0 0 3 Locked QAM256 10 597.0 -2.5 38.4 0 0 4 Locked QAM256 11 603.0 -2.5 38.3 0 0 5 Locked QAM256 12 609.0 -2.6 38.2 0 0 6 Locked QAM256 14 621.0 -3.3 37.5 1 0 7 Locked QAM256 15 627.0 -3.3 37.4 0 0 8 Locked QAM256 16 633.0 -3.1 37.5 0 0 9 Locked QAM256 17 639.0 -3.1 37.5 0 0 10 Locked QAM256 18 645.0 -3.3 37.4 0 0 11 Locked QAM256 19 651.0 -3.4 37.4 0 0 12 Locked QAM256 20 657.0 -3.5 37.4 0 0 13 Locked QAM256 21 663.0 -3.7 37.3 0 0 14 Locked QAM256 15 Locked QAM256 16 Locked QAM256 222 22 669.0 -3.9 37.2 0 0 23 675.0 -4.0 36.6 0 0 24 681.0 -4.1 37.1 0 0 Total 1 0
Transcribed Image Text:Downstream Bonded Channels Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected 1 Locked QAM256 13 615.0 -2.9 37.8 0 0 2 Locked QAM256 9 591.0 -2.5 38.4 0 0 3 Locked QAM256 10 597.0 -2.5 38.4 0 0 4 Locked QAM256 11 603.0 -2.5 38.3 0 0 5 Locked QAM256 12 609.0 -2.6 38.2 0 0 6 Locked QAM256 14 621.0 -3.3 37.5 1 0 7 Locked QAM256 15 627.0 -3.3 37.4 0 0 8 Locked QAM256 16 633.0 -3.1 37.5 0 0 9 Locked QAM256 17 639.0 -3.1 37.5 0 0 10 Locked QAM256 18 645.0 -3.3 37.4 0 0 11 Locked QAM256 19 651.0 -3.4 37.4 0 0 12 Locked QAM256 20 657.0 -3.5 37.4 0 0 13 Locked QAM256 21 663.0 -3.7 37.3 0 0 14 Locked QAM256 15 Locked QAM256 16 Locked QAM256 222 22 669.0 -3.9 37.2 0 0 23 675.0 -4.0 36.6 0 0 24 681.0 -4.1 37.1 0 0 Total 1 0
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