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In relative terms, this is why adjacent channel interference is worse than co-channel interference-no cooperation and packet “timing” is in place and packet collisions slow down network speeds for everyone.
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When wireless packets collide, the intended receivers get garbled, unreadable packets that have to be sent again for the transmission to complete. Unlike networks that share the same channel, adjacent channel networks cannot communicate with each other a transmission cooperation scheme and inevitably stations end up transmitting at the same time in which packet collisions occur. The more contention for ‘airtime’, the fewer the time slots to go around for every device and slower speeds results for everyone.Īdjacent channel interference: neighboring wireless LANs that are not on the same channel, but rather on an overlapping channel cause speed issues for 2.4 GHz networks. This cooperation is done between the devices in your network, as well as between your WLAN and your neighbors’ WLAN that share your channel. Each WiFi device “waits it’s turn” to communicate as WiFi technology has mechanisms in place to coordinate which station can transmit packets at what time. The reason behind this is that WiFi devices on the same channel can only talk one at a time. Use inSSIDer Office to check signal strength in key areas.Ĭo-Channel “interference”: The more WiFi networks and devices that share a channel, the slower the speed for everyone. Move or add access points so they are in the open and out of the way from high-loss materials. Places like inside server closets, or on steel shelving negatively affects signal and therefore speed. Place access points in a central place where signal will not be blocked. What to do: Again, access point location is key here. a 3 dB drop in signal equates to a 50% drop in power.) (Keep in mind that like the Richter Scale, the dB scale is not linear, but rather logarithmic. Right: WiFi signals going through objects and building materials. Different physical obstacles (and the material that they’re made out of) cause different amounts of loss. Two things cause a low signal strength condition: distance and physical obstacles such as walls and doors. Low signal strength = a low connected rate which creates low throughput over WiFi.
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Although these modulation methods keep devices connected to the network and passing data, it absolutely slows down speeds as the simpler modulations trade throughput for robustness. In order to keep communication going, WiFi has mechanisms built into it that simplifies the modulation so it’s more robust while dealing with weak transmissions. Relocating or adding wireless access points should be considered.Īs signal strength diminishes, it becomes more difficult for wireless packets to make it to and from wireless stations. For applications like Voice-Over WiFi, vendors recommend -67 dBm as a minimum. A good rule of thumb is that you at least need -80 dBm for any sort of usable connection. What to do: Measure signal strength with inSSIDer Office in the areas you need connectivity. In WiFi, of course this is no different, if there is no signal or very weak signal at the location you need, connectivity is impossible. This concept is obvious, especially since all of us carry mobile phones in our pockets-you’ve got to have signal coverage in order to pass data over the wireless network. Below are some common wireless problems that can be discovered and remedied by using inSSIDer Office. Some of which cannot be overcome by simply buying new WiFi equipment. Slow speeds and connectivity issues can be caused by a number of different unseen variables. Wireless can seem like a mystery, but that’s mostly because it’s invisible.
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