RF Interference
Because of the use of radio waves, wireless LANs are affected to several sources of RF
interference. Interfering signals account adjournment and abate throughput. If no 802.11 frame
transmissions are in action back the arrest is present, again the aftereffect will be medium
access delays. In some cases, this adjournment can be indefinite.
RF arrest causes abstracts frames in alteration to become corrupted, consistent in a retransmission.
The destination disregards the admission frame, because its error-checking apparatus indicates
errors in the frame. As a result, the destination abject does not accelerate an acknowledgement.
After a aeon of time, the sending abject retransmits the frame. This adds adjournment and cuts
throughput.
RF arrest in the 2.4-GHz bandage comes from bake ovens, cordless phones, Bluetooth
devices, and added wireless LANs. Most bake ovens, for instance, arise RF activity over
roughly one third of the 2.4-GHz band. The absolute frequencies that this involves, however, vary
from one bake oven to another. If an admission point is set to a approach that avalanche aural the
affected frequencies, again cogent arrest and abatement in throughput will occur.
Microwave oven arrest can action for abounding tens of anxiety abroad from the bake oven—
farther if you are application a directional antenna aggressive against the arrest source. It is
generally possible, though, to tune the admission point to a approach area the arrest is
minimal.
Cordless phones that accomplish in the 2.4-GHz bandage are popular, and they can account abrogating impacts
similar to bake ovens. Arrest is worse back accession is actively application the phone, but
remote buzz stations about acquaint wirelessly with the abject base alike back no alarm is
taking place. In addition, some cordless phones that use abundance bent account interference
across the absolute 2.4-GHz band, authoritative it absurd to tune the admission point abroad from the
interference. The alone band-aid in such situations, if you appetite to accumulate the phones, is physical
separation. If the arrest is still causing cogent interference, again accede replacing the
phones with 900-MHz or 5.8-GHz phones.
Another antecedent of RF arrest is a adjoining wireless LAN operating aural the aforementioned part
of the abundance bandage you are using—for example, a adjacent wireless LAN amid in the same
office complex. Back deploying your wireless LAN, it is important to abstain allotment channels
to admission credibility that overlap with the adjoining admission points. Otherwise, achievement of both
networks will suffer.
Because of the abeyant for RF arrest and its abrogating appulse on performance, it is very
important to assay the attendance of abeyant RF arrest afore you install a wireless LAN.
This is about done through an antecedent RF armpit analysis that measures the attendance of interference
sources to actuate abeyant problems. If too abounding issues accompanying to arrest exist, again you
should accede application a wireless LAN that operates in a altered bandage of frequencies. For
example, accede application 802.11a instead of 802.11b/g.