Is the Signal to Noise Ratio (SNR) of Your Cable Modem Slowing Down Your Internet Speed?

Is the Signal to Noise Ratio (SNR) of Your Cable Modem Slowing Down Your Internet Speed?

By James Waldrop

If you are having trouble with your cable provided Internet circuit, your first step is to determine whether the problem is in the Internet Service Provider’s (ISP) network or specific to your location. The best tool for determining the location of Internet trouble is an IP Packet Loss and Delay Test Tool. I’ve included some information on how to find and use one of these tools at the end of this article.

Let’s assume that you have used an IP Packet Loss Tool and found either significant latency or packet loss happening at your site. In other words, the problem is specific to your location. What should you do next? Check the signal-to-noise ratio (SNR or S/N) on the cable modem.

Signal-to-Noise Ratio

According to Wikipedia.org, “signal-to-noise ratio (SNR) is a measure used in science and engineering to quantify how much a signal has been corrupted by noise. It is defined as the ratio of signal power to the noise power corrupting the signal. A ratio higher than 1:1 indicates more signal than noise.”

An everyday example of SNR is listening to music in your car over road noise or other people talking. The louder the radio compared to the other noise in the car, the more clearly you hear the music. The same is true for your cable modem “hearing” the signal transporting your Internet traffic on your cable system. When the signal is loud compared to the noise, Internet communication happens at a faster speed with less packet loss. When the signal is not loud enough compared to the noise, speeds slow down causing latency. Packets may be lost, creating retransmissions of data packets and trouble with realtime applications such as Voice over Internet Protocol (VoIP).

Good SNR Values

SNR values are measured separately for downstream and upstream signals. Downstream is the signal transmitting from the cable provider or ISP to the cable modem. Upstream is the signal from the modem back to the provider.

Each cable modem is a little different but typical good values are:

Downstream SNR – 30:1 or more

Downstream Power – -8 to 8db (decibels)

Upstream SNR – 29:1 or more

Upstream Power – less than 55db

Determining the Values for Your Cable Modem

Many cable modem configuration pages can be viewed at the internal address of 192.168.100.1. Refer to http://broadband.modemhelp.net/cable_modem_info/index.shtml and look up the specific make and model of your cable modem. This website will give the modem configuration page address of the cable modem and the SNR values for optimal performance. As you check your cable modem’s SNR values, remember that these values can fluctuate. If you are experiencing intermittent problems, check the values when experiencing trouble and compare to the values when all is well.

Improving SNR Values

Cabling and connectors are the most common cause of poor SNR values. Inspect all cabling and connectors in line with the cable modem. There should not be any cable splices and the modem should be connected to the primary splitter entering your facility. In addition, the coax cable should not have any sharp bends. Repair any obvious problems and check the SNR values again.

If no obvious problems exist or repairs have not improved the SNR values, try moving the cable modem to the most immediate entry point in the facility. Attach it to the main feed, if possible. If the SNR values are good, then the problem is cabling in the facility. If the SNR values are still unacceptable, the problem is in the cable modem, outside cabling or equipment of the cable provider. You can try changing the cable modem, if you feel comfortable with that task. Otherwise, it is time to get the ISP/cable provider involved. You can report your findings of the SNR values.

Finding the Source of Internet Problems

Before examining SNR values, the first step in troubleshooting Internet problems is always determining the location of the trouble. Use an IP Packet Loss and Delay Test Tool to quickly determine whether the problem is happening at your location or within the ISP. The packet loss tool at the link above is free as it is 100% sponsored by HostMyCalls. HostMyCalls uses this tool to help its customers with their Internet connections. It is one of the top reasons why HostMyCalls delivers the best Hosted PBX voice quality of all VoIP Providers on the Internet.

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Where Can I Find Cheap Cable Internet?

It is easy to find the best Cable Internet deals and choose a affordable High Speed Cable plan that will fit your budget

Find A Cable Internet Provider In Your Area

 

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Posted by docsiscablemodem.com - January 12, 2011 at 12:03 am

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Advantages of Cheap Cable Broadband Internet?

Advantages of Cheap Cable Broadband Internet?

Broadband cable Internet has become increasingly popular nowadays because many consumers are opting for low cost fast Internet speed and at the same time want reliable Internet service 24/7. We always want high speed Internet services which are only made possible by broadband cable Internet which is up to 100 times faster than a dial-up Internet connection. Files such as pictures, video and software can be easily downloaded in just seconds or minutes. This is the reason why Cheap Broadband Cable Internet access can be used for online gaming. Since broadband cable Internet offers high speed connection, it is an excellent system for the use of cheap phone services through VoIP technology. Internet speed can reach up to 15 Mbps or more depending on the type of broadband service package you purchase.

Communication has never been this fast because of the use of Internet and mobile phones. If you want to install a fast but highly affordable internet connection, broadband cable Internet is the best way to go. Consequently, you will have no problems with using the phone again because with broadband cable Internet, you can use voice/fax and transmit data over the phone. You are connected to the Internet through a cable television network. The connection is more often than not always on, unlike when you are using dial-up. Dialing an access number in order to connect to the Internet is a thing of the past. Most of the broadband Internet providers offer unlimited access, with no extra connection charges based on duration. Broadband Internet can be accessed without being tied to a phone line. This is also true for wireless systems utilizing cable broadband Internet.

Internet usage is currently rapidly increasing while many people now use the Internet to communicate and do business. They look forward to an Internet service provider who offers excellent, affordable packages. Faster Internet speed is possible only through broadband Internet. Broadband cable Internet is also one of the most reliable in terms of Internet connection. The budget for broadband cable Internet ranges from $30 to $70 per month. Since time is really a significant factor, using cable Internet will make your work faster especially when doing business. This is the reason why a high speed cable Internet connection is favored by many.

Through the use of the same coaxial cable television wires which provide programming for digital TV, a person can also access the Internet through the same cable. High speed cable modems allow consumers to always be online without hooking up to phone lines. You can stay connected every minute throughout the day and your phone is free to receive incoming calls.

A Cheap Cable Internet connection is rather inexpensive especially in the long run. You still have to buy the necessary equipment, such as a DOCSIS Cable Modem,  before completing the installation, but when all systems are up you are ready to surf unlimited at super high speeds. You may even add a wireless router so that other members of your family will enjoy the same benefit broadband cable Internet offers.

DOCSIS Wikipedia Definition

 

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Posted by docsiscablemodem.com - January 9, 2011 at 12:20 am

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Cheap Cable Internet? – Why Get Cable?

Cheap Cable Internet? – Why Get Cable?

Broadband Internet use is increasing exponentially on daily basis and it is therefore no surprise that for most people, only the highest quality high speed Internet service at the cheapest possible cost is acceptable. This in itself is one of the reasons why Cable Internet has become so popular these days. Savvy consumers are interested only in the fastest Internet speeds at the lowest cost and additionally, they want to be assured of reliable Internet service at any time of the day or night.

Communication is very quick and easy today because of the Internet and cellular phones. Distance is no longer a communication barrier among world communities. If you want to install fast, affordable high speed Internet in your home or office, cable is the way to go.

High speed cable Internet utilizes the same coaxial cable television wires that provide digital television programming. In other words, a person with digital cable television service can also get access to very High Speed Cable Internet and use a land-line too. How can a computer, TV and phone share the same cable bandwidth? Television signals from various channels utilize only a portion the coaxial cable’s overall bandwidth, this leaves plenty of room to provide other digital services such as broadband Internet and digital telephone service. If you get a cable Internet bundle today, the cable provider will distribute it over the same coaxial cable that your television uses.

Using High Speed Cable Modems, it is possible for subscribers to be always online without tying up phone lines, an opportunity which is absent in dial-up modems. You will not even need a phone line to make use of a cable Internet connection which makes it the ideal choice for you if you have traded in landlines for a wireless cellular system. Since no phone line is used, there is always a connection to the Internet with no need to dial up for that connection. You can stay connected at every hour of the day without running the risk of being cut off by incoming calls.

The incredible speed at which data and information travel via a high speed cable Internet connection has made cable the first choice of many consumers. This Internet connection type is faster than dial-up, ADSL, wireless and it can achieve speeds up to ten megabits per second on a typical plan. New cable only DOCSYS 3.0 bonded channel modems can push cable Internet speeds up over 100 Mbps. This new technology makes it possible to transfer music, photos and even video at the highest speed possible on the Internet. It also enables you to really enjoy online gaming, if you dig the competition that can be readily found on the Internet, you’ll have a blast playing online games.

Time is a valued asset and no matter how much your work or business depends on the Internet, you want a situation where you can finish your work as soon as possible so that you can attend to other things. Because cable Internet is faster than most other Internet connections, you’ll spend less time waiting for pages to load or large files to download. The fact that cable is not as susceptible to Internet drop out as dial-up or mobile broadband connections makes it favored by many.

The initial cost of establishing high speed cable Internet service is what gives most people concern. All the necessary equipment must be purchased before the installation is complete after which you can begin to enjoy the speed and convenience of a Cheap Cable Internet Connection. The minimum requirement would be a compatible cable modem, although I would recommend adding an inexpensive wireless broadband router to your system to enable wireless high speed Internet throughout your entire home or office.

 

 

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Posted by docsiscablemodem.com - December 26, 2010 at 11:34 pm

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DSL or Cable Internet – Which is Better?

DSL vs. Cable:

Cable InternetAre you still using dial-up Internet access, and desire to upgrade to a high speed broadband connection? Or perhaps you’ve recently moved to a new area and need to order high speed Internet service?

Now you’re faced with a dilemma, should I choose DSL or Cable Internet Service?

Several factors come into play in choosing the right high speed Internet service provider; I have listed a few below.

Physical Location:

A lot depends on your location, DSL (Digital Subscriber Line) is only available a limited distance from the local phone company’s central office. High speed cable Internet is generally available anywhere the cable provider offers cable TV services.

Connection Speeds:

Broadband cable Internet connection speeds are usually faster. Newer DOCSIS 3.0 Cable Modems can provide up to 100Mbps download speeds. These blazing speeds aren’t yet available in most areas, but it’s coming soon. Cable download speed will vary, and is limited by the number of users sharing the bandwidth, and by the tier of service you purchase from the cable provider. DSL speeds don’t fluctuate like cable but will be limited by the quality of the connection and the service package that you purchase.

Monthly Cost:

In most local markets where both broadband DSL & High Speed Cable Internet service are available, pricing will be very competitive between the two, usually around $20 to $60 per month. Pricing also depends on other factors such as bundled services from the provider and Internet package connection speed. Most cable and DSL providers offer several tiers of service with costs increasing as speed, performance, and packaged extras such as an Internet security suite are added.

Conclusion:

There is really no clear cut answer to the debate of DSL vs. Cable, it really depends on what’s available in your local market and your personal High Speed Internet access needs and desires. I would personally recommend that you research the broadband Internet services that are available in your local area and make an informed decision on the broadband package that is just right for you or your family.

Check Prices In Your Area.




 

 

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Posted by docsiscablemodem.com - December 15, 2010 at 5:34 am

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Motorola SB6120 DOCSIS 3.0 Cable Modem – Read This Review

I just got a great online deal on a Motorola SB6120 SURFboard DOCSIS 3.0 eXtreme Broadband Cable Modem, and would like to share my personal experience with this product by reviewing it here.

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Posted by docsiscablemodem.com - December 14, 2010 at 1:27 am

Categories: Cable Modem Reviews, DOCSIS 3.0, Motorola   Tags: , , , , ,