How Telephone Wiring Affects Dial-Up Internet

Dial-up modems rely on traditional telephone lines for data connections.

Dial-up Internet service allows computer users to go online over standard copper telephone lines. If the lines are of poor quality or have any form of interference, the dial-up connection may work poorly or not at all.

Effect

Poor telephone wiring, according to the Internet reference website High Speed Internet Access Guide, can cause dial-up connections to fail to connect or terminate an existing connection. Less severe symptoms can include packet loss and numerous errors, and both of these conditions can cause the dial-up service to seem significantly slower than normal.

Function

In a dial-up connection, the user's computer modulates data into sound for transmission across the telephone line and demodulates incoming sound back into data. Each time the modem sends or receives data, it performs a quality check with the modem on the other end. If these checks fail, possibly because of poor line quality, the modem must resend the missing or corrupt data.

Considerations

Though poor quality telephone wiring can cause a number of dial-up issues, several other factors may lead to similar symptoms. According to the Internet reference website DSL Reports, issues like trouble on the telephone network, a faulty modem and even interference from analog telephones on the same line can also cause latency and outages.

References

• DSL Reports: Dialup FAQ - Troubleshooting Your Line
• High Speed Internet Access Guide: What Causes Dial Up To Be Slow?