With WiFi 6E, the next-generation xFi Advanced Gateway (XB8) is “tri-band,” which means it broadcasts three independent radio bands 2.4GHz, 5GHz, and 6GHz. Visit Overview of Xfinity Gateways to learn more about xFi Gateways. In the past, it was recommended that you use a different WiFi name and password for each band.
What is the frequency of Comcast internet?
Fundamentals of radio frequency (RF) Most of us are used to shifting the dial on our FM radios.
If you don’t like what’s on Soft 95.1 FM, switch to 102.5 FM (Kenneth) for some classic rock.
What you’ve actually done is switched your car stereo’s RF (radio frequency) tuner from a lower frequency of 95.1 MHz to a higher frequency of 102.5 MHz, where a different station was playing.
Frequency Division Multiplexing, or FDM, refers to the fact that two distinct stations were broadcasting at different frequencies.
FDM is a technique used in cable television to transmit several television channels to our homes over a single RF coaxial connection.
The frequency range for television signals sent to our houses typically ranges from 54 MHz to 1000 MHz (though many current systems only support 750 MHz or 860 MHz).
In DOCSIS, the CMTS, or Cable Modem Termination System, is a device at the cable operator’s headend that manages hundreds or thousands of cable modems in subscribers’ homes (aka you and me).
Like all other television channels, the CMTS provides data to cable modems by delivering a 6 MHz wide band of information (1’s and 0’s) in an FDM mode.
The 1s and 0s are now transformed to Quadrature Amplitude Modulation (QAM) and RF-upconverted, but more on that in my upcoming piece, “Advanced RF Fundamentals.”
So, if the cable modems connect with the CMTS between 54 and 1000 MHz, how do the cable modems relay data back to the CMTSs?
Isn’t it true that we wish to send data in both directions across the Internet?
Cable plants actually send RF signals in two directions, which is a fascinating but little-known feature about them.
Figure 1 shows the situation.
The forward (or downstream) link runs from the cable operator’s headend to the subscriber and can range in frequency from 54 to 1000 MHz.
The upstream is what is returned to the cable operator’s headend from each home.
This frequency band is usually between 5 and 42 MHz.
Now, cable modems can send data back to the CMTS via FDM in the upstream, sending 1s and 0s that are transformed to QPSK or QAM and then RF-upconverted.
How can I determine the strength of my Comcast signal?
Click XFINITY Network in the second sub-menu. This will take you to the Gateway > Connection > Xfinity Network page. Verify that power levels for each downstream channel are within the allowed range of – 15 dBmV to + 15 dBmV in the Downstream section.
What causes Xfinity internet speeds to fluctuate?
One of the reasons Comcast’s Internet speed varies is because a client isn’t using Comcast-recommended equipment. Comcast recommends a computer with a 1.5GHz processor, 1GB of RAM, and Windows XP or higher as the operating system. Users should also utilize a current browser, an acceptable modem, and, if necessary, an 802.11n-capable wireless router. Visit Comcast’s DOCSIS Device Information Center modem list if you’re unsure about your modem’s compatibility. To get the most out of Comcast’s Internet service, consumers should always go above and above the bare standards.
What should the signal levels of my modem be?
We don’t have Gigabit internet service here; in fact, download speeds are limited to roughly 150 Mbps and upload speeds are limited to about 8 Mbps. Because our internet provider only accepts DOCSIS 3.0 modems, the Arris SURFboard SB6183 cable model is an excellent match. Download speed is necessary if you want to watch high-quality films, but upload speed is crucial if you want to look good during a video conference.
I have 16 downstream channels and 2 upstream channels with my Internet Service Provider (ISP) and service package. When you go to the cable modem’s status page, you’ll see the following critical information regarding each of those channels:
The power levels for the downstream channels should be in the range of, and they should all be within three dB of one another.
The range for upstream channels is, and they should all be within three decibels of each other. The power restrictions for 3 to 4 channels on various networks are 35 to 51 dBmV. For single channels, ideal levels are around 40 to 50 dBmV, and for 2 to 4 channels, 37 to 48 dBmV apiece.
All of the Signal to Noise Ratios should be within three decibels of one another. SNR should be 33 dB or higher for power levels -15 to -6 dBmV, and 30 dB or higher for power levels -6 to +15 dBmV.
A large number of uncorrected packets (thousands or more) reported over time may not indicate a problem, at least not if they account for less than 20% or more of the corrected packets.
My modem’s information after a little more than 7 days of uptime doesn’t look all that fantastic, but it’s probably more than enough for my ISP.
The downstream channels have power levels ranging from 2.7 to -3.1 dBmV.
The upstream channels have power levels ranging from 47.5 to 50.3 dBmV.
The SNR range is 33.2 to 34.7 dB, yet in one of the downstream channels, the uncorrectable packets account for over 24% of the corrected packets.
What is the frequency of cable television?
Many channels of TV signals are carried through the in-house coaxial cable wiring. Channels 2 through 13 of the traditional TV VHF channels
FM broadcast stations use frequencies ranging from 54 to 216 MHz, with frequency gaps in between. Off-the-air UHF channels 14 to 69 operate on frequencies ranging from 470 to 806 MHz. The frequency layout for off-the-air TV channels is shown in Table 3.4.
Part 73 (Radio Broadcast Services) of the FCC rules and regulations, often known as CFR title 47, governs this TV channel frequency arrangement. The radio astronomy service has exclusive use of Channel 37, which runs from 608 to 614 MHz. There are a lot of digital channels that aren’t broadcast on the air.
For the analog-to-digital transition period, TV channels have been assigned to the UHF frequency band. Location and channel numbers are included in the detailed information.
The most recent Part 73 document also contains this information.
Table 3.4. Numerical Designation of Off-the-Air Television Channels.
Only channels 2 through 13 of cable TV share the same frequency configuration as off-the-air TV. Immediately preceding
Channel 13 has a frequency range of 210 to 552 MHz, and cable TV channels have a frequency range of 210 to 552 MHz.
between the ages of 23 and 78. Cable TV channels 14 to 22 use a frequency range of 120 to 174 MHz, which overlaps with the frequency range of traditional television.
Because cable TV signals are contained within coaxial wires, there is no conflict with FM broadcast services.
The EIA’s “Cable Television Channel Identification Plan, EIA IS132, May 1994” lays out this channel allocation strategy.
(EIA IS132) (EIA IS132) (EIA IS132) (EIA IS132 This channel frequency configuration is shown in Table 3.5. Part 76 (Cable Television) provides further regulation for the cable television business.
CFR title 47 is a set of FCC rules and regulations that must be followed.
Above channel 78, starting at 552 MHz, 33 digital cable channels with a frequency range of up to 750 MHz might be assigned. Digital
Cable modem and digital TV services can both use cable channels. It is believed that a cable’s video carrier
At an impedance of 75 ohms, the TV channel should have a signal strength of roughly 0 dBV.
Table 3.5. Numerical Designation of Cable Television Channels
A reverse channel is necessary to relay user commands or information back to the head end while providing cable modem services.
Reverse channels have been assigned to the frequency spectrum below regular TV channel 2. There is a convention known as
The reverse channel of a sub-split has a frequency band of 5 to 30 MHz. There’s also a convention known as enlarged sub-split.
The frequency band for the reverse channel is 5 to 42 MHz. Reverse channels with a frequency range of 25 to 37 MHz are available.
A cable modem standard has been proposed by the IEEE 802.14 study group. Signal intensities for the reverse channel that are recommended
For sub-split and extended sub-split, the ranges are 5 to 55 dBV and 58 dBV, respectively.
Cable TV channel allocations have taken up the majority of the frequency band on existing in-house wiring. To transmit local television signals as well as data traffic, CEBus has recommended a dual coaxial cable wiring scheme. In the event that a second occurs
The frequency region between the top edge of the reverse channel at 42 MHz and the lower edge of the reverse channel at 42 MHz is not available through coaxial cable.
A coaxial cable-based home network can be established using TV channel 2 at 54 MHz. This home network is powered by coaxial cable.
By limiting out-of-band energy at 60 dB below these TV channels, it should not interfere with either TV channels or reverse channels.
or signals from the opposite channel
How do you determine the intensity of a WiFi signal?
Make use of your smartphone or tablet. Look in the menus for Settings, Wi-Fi, or Network. Select Network & internet, select the Wi-Fi you’re using, and then select the gear icon next to the network you’re connected to in the settings on a Google Pixel with Android 10. The signal strength is displayed there.
How do I check the strength of my Xfinity X1 signal?
Low Signal Indicator can be highlighted using the arrow buttons on the remote. Toggle the feature on by pressing OK (or the raised button in the center of the directional pad if your X1 remote lacks an OK button). The signal will then appear next to the time and temperature in the upper right corner of your screen.
Why is my Comcast internet suddenly so slow in 2021?
Symptom: Your internet speeds are as advertised in your internet package, yet it still feels slow, especially when numerous people are online at the same time.
Your Xfinity internet may be slow because your current plan does not provide enough bandwidth to keep up with your online usage. This is particularly true if you’ve begun working or learning from home.
If your router isn’t the problem, but your internet still slows down while numerous people are online, it’s time to upgrade your plan.