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.
6. Congested ISP. ISPs frequently become congested during heavy traffic and sometimes during normal traffic use. Congestion can also happen between routers in their network and are especially prevalent in meet points between two ISPs. Detecting ISP congestion requires monitoring the Internet circuit with an ISP Packet Loss and Delay Test Tool. If the problem is intermittent, then the tool must monitor over an extended period of time such as several days or even a week.
Here are the most frequent causes of a slow Internet connections:
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.
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.
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