2. DSL circuit frequency interference. If its a DSL circuit, interference from other circuits in the telephone companys cable bundle can cause packet loss, latency and outages. T1 circuits are prone for causing problems. T1 circuits installed in neighbors offices can interfere with DSL.
If you are connected to the Internet but it is not performing as it should, the first step is to start a ISP Packet Loss and Delay Test on the IP address. This test will determine whether the problem is predominantly in or around the home/office of the IP address or somewhere within the ISP.
1. Faulty electrical connection near Internet modem/router. Faulty electrical connections can be caused by bad cabling and loose connections. If its a cable modem, the modem must be attached to the first cable split and preferably the connection with the greatest signal level. If its a DSL circuit, no other cables should attach to the circuit between the telephone company box and the DSL splitter.
7. ISP Not Delivering Promised Speed. Unless the Internet connection is a fixed circuit such as a T1, the delivered bandwidth from an ISP can vary throughout the day. Typically, the varied rate is due to congestion but it can be other factors as well. Still the rate can frequently be below the expected bandwidth. Speed tests can help determine the delivered bandwidth at a precise moment in time. Be careful, as speed tests results can frequently be misleading and they measure only what is happening at one moment versus an extended period of time.
4. Virus, Worm or Trojan on a PC. Viruses, worms and Trojans can do more than just slow down a PC, they can slow down an entire network. Depending on what they are doing, they can be sending out significant network traffic that can slow down an internal network and give the appearance that the Internet is slow. They can also be sending traffic out to the Internet which would indeed slow down the Internet because they are consuming such a large quantity of bandwidth. It is wise to check PCs for malware anytime a network is slow for no apparent reason.
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