If you’re having bother along with your cable supplied Web circuit, your first step is to find out whether or not the issue is within the Web Service Supplier’s (ISP) community or particular to your location. The perfect instrument for figuring out the situation of Web bother is an IP Packet Loss and Delay Take a look at Instrument. I’ve included some data on how one can discover and use certainly one of these instruments on the finish of this text.

Let’s assume that you’ve used an IP Packet Loss Instrument and located both important latency or packet loss taking place at your website. In different phrases, the issue is particular to your location. What must you do subsequent? Verify the signal-to-noise ratio (SNR or S/N) on the cable modem.

Sign-to-Noise Ratio

In response to Wikipedia.org, “signal-to-noise ratio (SNR) is a measure utilized in science and engineering to quantify how a lot a sign has been corrupted by noise. It’s outlined because the ratio of sign energy to the noise energy corrupting the sign. A ratio larger than 1:1 signifies extra sign than noise.”

An on a regular basis instance of SNR is listening to music in your automobile over street noise or different individuals speaking. The louder the radio in comparison with the opposite noise within the automobile, the extra clearly you hear the music. The identical is true in your cable modem “listening to” the sign transporting your Web visitors in your cable system. When the sign is loud in comparison with the noise, Web communication occurs at a quicker pace with much less packet loss. When the sign is just not loud sufficient in comparison with the noise, speeds decelerate inflicting latency. Packets could also be misplaced, creating retransmissions of information packets and bother with realtime purposes similar to Voice over Web Protocol (VoIP).

Good SNR Values

SNR values are measured individually for downstream and upstream indicators. Downstream is the sign transmitting from the cable supplier or ISP to the cable modem. Upstream is the sign from the modem again to the supplier.

Every cable modem is just a little totally different however typical good values are:

Downstream SNR – 30:1 or extra

Downstream Energy – -Eight to 8db (decibels)

Upstream SNR – 29:1 or extra

Upstream Energy – lower than 55db

Figuring out the Values for Your Cable Modem

Many cable modem configuration pages will be seen on the inside tackle of Check with http://broadband.modemhelp.net/cable_modem_info/index.shtml and lookup the precise make and mannequin of your cable modem. This web site will give the modem configuration web page tackle of the cable modem and the SNR values for optimum efficiency. As you test your cable modem’s SNR values, keep in mind that these values can fluctuate. If you’re experiencing intermittent issues, test the values when experiencing bother and evaluate to the values when all is effectively.

Enhancing SNR Values

Cabling and connectors are the commonest explanation for poor SNR values. Examine all cabling and connectors according to the cable modem. There shouldn’t be any cable splices and the modem ought to be linked to the first splitter getting into your facility. As well as, the coax cable shouldn’t have any sharp bends. Restore any apparent issues and test the SNR values once more.

If no apparent issues exist or repairs haven’t improved the SNR values, strive shifting the cable modem to essentially the most speedy entry level within the facility. Connect it to the primary feed, if attainable. If the SNR values are good, then the issue is cabling within the facility. If the SNR values are nonetheless unacceptable, the issue is within the cable modem, exterior cabling or tools of the cable supplier. You may strive altering the cable modem, in case you really feel comfy with that job. In any other case, it’s time to get the ISP/cable supplier concerned. You may report your findings of the SNR values.