interference issues

interefencre - multiple networks on the same channel. intereference can lead to re transmissions.

on site survey make sure to look at wha channels.

on a 2.4 ghz use 1 6 11 to make sure you’re using the whole spectrum.

use 1. 6. and 11 if using multiple access points ina long hallway, have 10 - j10% overlap so devices can handoff.

if using 5g using a honeycomb.

attenuation - redution of signal between the tx and rx can happen for too much distance, wall or other obstical. more noise in the environment. can happen iin the antenna’s cable or in the wave. to increase signal str, possibly increase the quality of the antenna

📡 Wireless Interference Issues

What is Interference?

Occurs when multiple networks/devices use the same frequency/channel.
Causes collisions, retransmissions, and poor throughput.

2.4 GHz Channels

Only 3 non-overlapping channels: 1, 6, 11.
Best practice:
- Use 1, 6, 11 when deploying multiple APs.
- Keep 10–15% overlap for seamless roaming/handoff in long hallways.

5 GHz Channels

More available channels than 2.4 GHz.
Often deployed in a honeycomb pattern to avoid overlap and maximize coverage.

Attenuation (Signal Loss)

Reduction of signal strength between transmitter (Tx) and receiver (Rx).
Causes:
- Distance (too far from AP)
- Walls, floors, physical barriers
- Environmental noise/interference
- Antenna cable loss
Fixes:
- Higher quality antennas
- Better cable shielding
- Proper AP placement

⚡ Exam Tips

2.4 GHz = longer range, fewer channels, more interference.
5 GHz = shorter range, more channels, less interference.
Remember: Attenuation ≠ Interference.
- Attenuation = weaker signal.
- Interference = competing signals.