Suggest an editImprove this articleRefine the answer for “What is interference?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Interference** is a phenomenon in which signals interfere with one another, which distorts the information being transmitted. **Key point:** because of interference a 0 may be received as a 1 (and vice versa), which increases the error rate and lowers transmission speed.Shown above the full answer for quick recall.Answer (EN)Image**Interference** is a phenomenon in which **signals interfere with one another**, which **distorts the information being transmitted**. Put simply: interference is **noise** that happens when one signal "overlaps" another. --- ## How interference occurs Interference arises when: - **several signals** are transmitted over one medium - there are **sources of interference** nearby - the signals have **similar frequencies** As a result: - a 0 may be received as a 1 - a 1 may be received as a 0 - the signal becomes "noisy" --- ## Examples of interference ### In wired networks - neighboring cables affect one another - poor shielding - a long cable: the signal weakens and gets distorted Example: > an Ethernet cable runs next to a power cable --- ### In wireless networks - several Wi-Fi networks on the same frequency - a microwave oven, Bluetooth, radio devices - signal reflections from walls and objects Example: > in an apartment with 10 Wi-Fi networks, speed drops --- ## Why interference is a problem Because of interference: - the number of errors increases - transmission speed drops - connection drops are possible The physical layer **deals with interference directly**, because it works with the real signal. --- ## How it is countered (briefly) At the physical layer: - shielding cables - twisting the twisted pair - choosing a different frequency - amplifying and filtering the signal --- ## Simple analogy A conversation in a noisy room: - what you say is the useful signal - the noise around you is the interference - the other person hears worse and asks you to repeat --- ## Briefly, for the interview > **Interference** is the mutual effect of signals or noise on one another, which distorts the transmitted signal and causes errors during data transmission.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.