KwickClips Networks and the Internet · 40 sec · free
What is interference?
Short answer. Electrical noise that disturbs the signals carrying the bits.
Name two things that can happen to a bit in transmission.
It can be lost, or changed from 1 to 0.
Causes of errors
| Interference: electrical noise |
| Weak signal over distance |
| Bits lost, gained or changed |
Remember
| Noise and distance cause errors |
You send one, it arrives as zero. Why? Three causes matter. Interference is electrical noise. Signals weaken over distance. So bits get lost, gained or changed. Remember. Noise and distance cause errors.
This clip is from the full lesson: Error Detection: Parity, Checksum, Echo Check and ARQ — 8 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: Cambridge IGCSE Grade 9 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478)
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