Spread Spectrum Control

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Spread Spectrum Control: This function is used for meeting the specifications when complying with the CE acceptance test. Enabling it leads to a noticeable deterioration in performance.
www.tomshardware.com/reviews/bios-tunin…
What do you mean by spread spectrum communications?
What do you mean by spread spectrum communications?
A spread spectrum communications system is one that is built upon the principle of transmitting information signals over a much wider bandwidth than is strictly necessary for transferring the information.
www.sciencedirect.com/topics/engineering/…
Is the spread spectrum control a performance boost?
Is the spread spectrum control a performance boost?
Performance boost: The "Spread Spectrum Control" function slows the system. It should always be disabled. This feature helps boost performance slightly. Spread Spectrum Control: This function is used for meeting the specifications when complying with the CE acceptance test. Enabling it leads to a noticeable deterioration in performance.
www.tomshardware.com/reviews/bios-tunin…
When to enable or disable spread spectrum control?
When to enable or disable spread spectrum control?
The fundamentals of overclocking demand the cleanest, purest signal possible, which is why spread spectrum should always be disabled unless you have a good reason to enable it. Ergo, CPU Spread Spectrum, PCIE Spread Spectrum, MCP PCIE Spread Spectrum, SATA Spread Spectrum, and LDT Spread Spectrum should all be set to Disabled.
Who was the inventor of spread spectrum communications?
Who was the inventor of spread spectrum communications?
Spread-spectrum communications technology was first described on paper by an actress and a musician! In 1941 Hollywood actress Hedy Lamarr and pianist George Antheil described a secure radio link to control torpedos. They received U.S. Patent #2.292.387.
pdfserv.maximintegrated.com/en/an/AN189…
https://www.anandtech.com/show/2500/20
11.04.2008 · Spread Spectrum Control Spread spectrum controls are really added to motherboards for one purpose only - they are sometimes needed so that a device for sale …
https://www.tomshardware.com/reviews/bios-tuning,346-18.html
26.07.2001 · This feature helps boost performance slightly. Spread Spectrum Control: This function is used for meeting the specifications when complying with the CE …
Расширение спектра — способ повышения эффективности передачи информации с помощью модулированных сигналов …
Псевдослучайная перестройка рабочей частоты
Текст из Википедии, лицензия CC-BY-SA
https://en.m.wikipedia.org/wiki/Spread_spectrum
Spread spectrum generally makes use of a sequential noise-like signal structure to spread the normally narrowband information signal over a relatively wideband (radio) band of frequencies. The receiver correlates the received signals to retrieve the original information signal. Originally there were two motivations: either to resist enemy efforts to jam the communications (anti-jam, or AJ), or to hide the fact that communication was even taking place, sometimes called low probabil…
Spread spectrum generally makes use of a sequential noise-like signal structure to spread the normally narrowband information signal over a relatively wideband (radio) band of frequencies. The receiver correlates the received signals to retrieve the original information signal. Originally there were two motivations: either to resist enemy efforts to jam the communications (anti-jam, or AJ), or to hide the fact that communication was even taking place, sometimes called low probability of intercept (LPI).

Frequency-hopping spread spectrum (FHSS), direct-sequence spread spectrum (DSSS), time-hopping spread spectrum (THSS), chirp spread spectrum (CSS), and combinations of these techniques are forms of spread spectrum. The first two of these techniques employ pseudorandom number sequences—created using pseudorandom number generators—to determine and control the spreading pattern of the signal across the allocated bandwidth. Wireless standard IEEE 802.11 uses either FHSS or DSSS in its radio interface.
• Techniques known since the 1940s and used in military communication systems since the 1950s "spread" a radio signal over a wide frequency range several magnitudes higher than minimum requirement. The core principle of spread spectrum is the use of noise-like carrier waves, and, as the name implies, bandwidths much wider than that required for simple point-to-point communication at the same data rate.
• Resistance to jamming (interference). Direct sequence (DS) is good at resisting continuous-time narrowband jamming, while frequency hopping (FH) is better at resisting pulse jamming. In DS systems, narrowband jamming affects detection performance about as much as if the amount of jamming power is spread over the whole signal bandwidth, where it will often not be much stronger than background noise. By contrast, in narrowband systems where the signal bandwidth is low, the received signal quality will be severely lowered if the jamming power happens to be concentrated on the signal bandwidth.
• Resistance to eavesdropping. The spreading sequence (in DS systems) or the frequency-hopping pattern (in FH systems) is often unknown by anyone for whom the signal is unintended, in which case it obscures the signal and reduces the chance of an adversary making sense of it. Moreover, for a given noise power spectral density (PSD), spread-spectrum systems require the same amount of energy per bit before spreading as narrowband systems and therefore the same amount of power if the bitrate before spreading is the same, but since the signal power is spread over a large bandwidth, the signal PSD is much lower — often significantly lower than the noise PSD — so that the adversary may be unable to determine whether the signal exists at all. However, for mission-critical applications, particularly those employing commercially available radios, spread-spectrum radios do not provide adequate security unless, at a minimum, long nonlinear spreading sequences are used and the messages are encrypted.
• Resistance to fading. The high bandwidth occupied by spread-spectrum signals offer some frequency diversity; i.e., it is unlikely that the signal will encounter severe multipath fading over its whole bandwidth. In direct-sequence systems, the signal can be detected by using a rake receiver.
• Multiple access capability, known as code-division multiple access (CDMA) or code-division multiplexing (CDM). Multiple users can transmit simultaneously in the same frequency band as long as they use different spreading sequences.
https://www.sciencedirect.com/topics/engineering/spread-spectrum-communications
3.1 Spread spectrum basics A spread spectrum communications system is one that is built upon the principle of transmitting information signals over a much wider bandwidth than is strictly …
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08.04.2020 · I built a semi-custom spread spectrum RF control and telemetry link for the mjbots quad A1 …
https://pdfserv.maximintegrated.com/en/an/AN1890.pdf
Resistance to interception is the second advantage provided by spread-spectrum techniques. Becausenonauthorized listeners do not have the key used to spread the original signal, those listeners cannotdecode it. Without the right key, the spread-spectrum signal appears as noise or as an interferer.(Scanning methods can break the code, however, if the key is short.) Even better, signal levels can bebelow the noise floor, because the spreading …
https://linustechtips.com/topic/828135-spread-spectrum-on-or-off
29.08.2017 · No practical reason, nothing of actual use in day to day unless you live near a power plant or towers with high voltage cabling which cause EMI. Spread Spectrum helps …
Always off if you're overclocking - http://www.anandtech.com/show/2500/20
Thanks. What about at stock speeds? When would I want it on?
Assuming clock and voltages all at stock 99% of the time it won't make any difference in day to day, you will maybe see very slightly higher clock...
Ok thanks. So there is no reason to have it on?
No practical reason, nothing of actual use in day to day unless you live near a power plant or towers with high voltage cabling which cause EMI. Sp...
Thanks a lot. Dumb question- Why would I care about EMI? Is it bad for my computer or something?
http://www.pcguide.com/care/care/gen/envEMI-c.html "Interference can lead to data loss, picture quality degradation on monitors, and other problems...
Thank you very much. I do not have any of those issues, so I guess I will just leave spectrum off.
https://discussionsbytopic.com/spread-spectrum-control
17.03.2015 · Tried different ProcODT settings, disabled spread spectrum control. Tried lowering the FCLK and still getting errors at idle. At 1900 I no longer get errors at idle but will start getting …
https://www.overclock.net/threads/how-do-i-disable-spread-spectrum.1742330
19.02.2020 · Asus likes to not give us HPET or Spread Spectrum controls for whatever arbitary reason I have the same board, youre never going to get 100.00 blck . Save Share. Reply.
https://rog.asus.com/forum/showthread.php?106012-ASUS-ROG-Strix-B450-F-Gaming-Spread...
31.10.2018 · ASUS ROG Strix B450-F Gaming: Spread Spectrum Control? Hello, welcome to ASUS Republic of Gamers Official Forum. Please note you may have to register before you can …
components.ru/Api-Technologies-Spe...
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Index
It's getting expensive…
ASUS Striker II Extreme Board Layout and Features
ASUS Striker II Extreme Specifications
Test System Configuration and Methodology
Overall System Performance with PCMark Vantage
Synthetic 3D Graphics Results
Game Testing - Crysis
Game Testing - Unreal Tournament 3
Game Testing - Company of Heroes: Opposing Fronts
Intel 45nm Quad-Core Overclocking
Memory Access Latency and Read Performance
Memory Write and Copy Performance
Complete BIOS Tuning Guide - "Extreme Tweaker"
Complete BIOS Tuning Guide - "Extreme Tweaker" (Cont'd)
Complete BIOS Tuning Guide - "Memory Timing Setting"
Complete BIOS Tuning Guide - "Over Voltage"
Complete BIOS Tuning Guide - "Over Voltage" (Cont'd)
Complete BIOS Tuning Guide - "CPU Configuration"
Complete BIOS Tuning Guide - "Spread Spectrum Control"
Final Thoughts and Recommendations
Complete BIOS Tuning Guide - "Spread Spectrum Control"
Spread spectrum controls are really added to motherboards for one purpose only - they are sometimes needed so that a device for sale within the US can include a legitimate Declaration of Conformity stating compliance with Part 15 of the Federal Communications Commission (FCC) Rules. This stipulates that operation of the device (motherboard), (a) may not cause harmful interference, and (b) must accept any interference received, including interference that may cause undesired operation. Sales of electronic devices within the US require the strict observation of all FCC rules and regulations.
As a general requirement, every motherboard must be capable of generating and distributing more than one common clocking signal used to coordinate latching times as needed for the transfer and receipt of data across the many high-speed interfaces found in today's systems. Because it is uncommon for different busses to share similar operating frequencies, and because each must be kept independent of the others, a significant portion of motherboard resources are spent locating, monitoring, and regulating these circuits. Each circuit must include a reference frequency, or known base frequency, from which all other frequencies can be derived. A local oscillator usual provides this functionality.
The problem is these oscillators can sometimes cause electromagnetic interference (EMI) centered about their operating frequencies. In an effort to prevent these types of undesired interferences the FCC, an independent licensing organization for devices capable of transmitting electromagnetic signals, either intended or otherwise, operating under the purview of the US government, enacted "Rule 15," effectively limiting the output power of such devices.
Engineers, looking for a way to meet regulation, began using a method for limiting such interferences called spread spectrum clocking. Spread spectrum clocking causes the signal regulation circuit to slightly vary the frequency about the target frequency, effectively "spreading" the power over a somewhat larger frequency band. The method of operation can be used to control system output power below the FCC standard limits, allowing for a claim of full compliance.
As you can imagine, even the smallest variation in a clocking signal can be enough to create data transfer errors. The fundamentals of overclocking demand the cleanest, purest signal possible, which is why spread spectrum should always be disabled unless you have a good reason to enable it. Ergo, CPU Spread Spectrum, PCIE Spread Spectrum, MCP PCIE Spread Spectrum, SATA Spread Spectrum, and LDT Spread Spectrum should all be set to Disabled.
Complete BIOS Tuning Guide - "CPU Configuration" Final Thoughts and Recommendations
Index
It's getting expensive…
ASUS Striker II Extreme Board Layout and Features
ASUS Striker II Extreme Specifications
Test System Configuration and Methodology
Overall System Performance with PCMark Vantage
Synthetic 3D Graphics Results
Game Testing - Crysis
Game Testing - Unreal Tournament 3
Game Testing - Company of Heroes: Opposing Fronts
Intel 45nm Quad-Core Overclocking
Memory Access Latency and Read Performance
Memory Write and Copy Performance
Complete BIOS Tuning Guide - "Extreme Tweaker"
Complete BIOS Tuning Guide - "Extreme Tweaker" (Cont'd)
Complete BIOS Tuning Guide - "Memory Timing Setting"
Complete BIOS Tuning Guide - "Over Voltage"
Complete BIOS Tuning Guide - "Over Voltage" (Cont'd)
Complete BIOS Tuning Guide - "CPU Configuration"
Complete BIOS Tuning Guide - "Spread Spectrum Control"
Final Thoughts and Recommendations
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