In case you are having hassle along with your cable offered 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 most effective instrument for figuring out the placement of Web hassle is an IP Packet Loss and Delay Check Instrument. I’ve included some data on the best way to discover and use one in all 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 occurring at your website. In different phrases, the issue is restricted to your location. What do you have to do subsequent? Examine the signal-to-noise ratio (SNR or S/N) on the cable modem.
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 greater than 1:1 signifies extra sign than noise.”
An on a regular basis instance of SNR is listening to music in your automotive over highway noise or different folks speaking. The louder the radio in comparison with the opposite noise within the automotive, the extra clearly you hear the music. The identical is true to 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 velocity with much less packet loss. When the sign isn’t loud sufficient in comparison with the noise, speeds decelerate inflicting latency. Packets could also be misplaced, creating retransmissions of knowledge packets and hassle with realtime purposes resembling 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 completely 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 might be seen on the inner tackle of 192.168.100.1. Discuss with http://broadband.modemhelp.internet/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 examine your cable modem’s SNR values, keep in mind that these values can fluctuate. In case you are experiencing intermittent issues, examine the values when experiencing hassle and evaluate to the values when all is nicely.
Enhancing SNR Values
Cabling and connectors are the most typical reason for poor SNR values. Examine all cabling and connectors consistent with the cable modem. There shouldn’t be any cable splices and the modem needs to be related 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 examine the SNR values once more.
If no apparent issues exist or repairs haven’t improved the SNR values, attempt transferring the cable modem to essentially the most instant entry level within the facility. Connect it to the primary feed, if doable. 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, outdoors cabling or gear of the cable supplier. You possibly can attempt altering the cable modem, if you happen to really feel comfy with that process. In any other case, it’s time to get the ISP/cable supplier concerned. You possibly can report your findings of the SNR values.