Cisco 3600s AP installation in Warehouse and Factory
Warehouse installations are often difficult because of the very high ceilings and the clutter of the material in storage. As part of your site survey, always check the coverage when the warehouse is fully stocked, since the material in storage can change the RF coverage and interfere with uniform coverage.
For aisles, use directional (patch) antennas on the wall and shoot down the aisles. You can also use lowgain omnidirectional antennas (such as dipoles) on the ceiling or units with integrated antennas; high gain omnidirectional antennas tend to have more nulls.
The higher the AP is mounted, the farther the signal must travel. Use pipe and electrical box mounting techniques to lower the AP (external and internal antenna models) so that it is closer to users.
A proper site survey normally included the ap model and antennas. If these are internal antennas and placed high you could see issues. Almost all solid warehouse surveys use patch antennas to direct the signal it keep down interference.
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So here is the thing. When you have ceiling that high, what is the highest clearance required by the warehouse? There are typical area that are walkways, which have a lower requirement and might also have exit signs that are dropped from the ceiling. In areas with forklift trucks, I have seen the lowest allowed clearance has to be a few feet above the highest rack with one skid, which allows the skip to be lifted up for placement and or removal.
When you know this info, you can run a junction box on the ceiling that is break away. Then run conduit down to the appropriate height (AFF-above finish floor) with another junction box to mount the universal access point mounting bracket in which the ap will be placed. Like I mentioned, in areas that are dedicated by walk ways or non forklift areas, you can drop the access points pretty far down. Using the height of the emergency exits signs will give you a good example of the height requirement. These break away junction boxes will not fall if hit by a forklift or skid. They will just swing and then you can fix it.
I have done many high ceiling warehouses with 3602i's, but I have also done a site survey. There are only a few site that I have deployed patches, but it will be determined by a site survey.
Can you please explain what a "break away junction box" is ? Maybe post a link or a picture ?
Yes guys I know directional antennas would be a better option, and have done multiple warehouses like that (with the now end-of-life 1242 APs), but unfortunatly we were only asked to do the installation.
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