The technology was beautiful, and when the ceiling opened up, it saw old wires that were tied together, and all the spin-downs and minor services had to be put back on. I took this down in several old garden renovation projects, so now when we go to the site, the first thing is not to look at the engine room, but at the ceiling and the weak wells.
The network is not a six-line line, so you can't run more than a gigabyte of certified traffic.
The first hard constraint on the physical layer of WiFi certification systems is integrated cabling. Many old parks were still paved with super-five or even five types of wire, and running a gigabyte at short range, but when POPE powered and gigabytes ran simultaneously, cable quality was not enough to drop. Portal page loading in authentication processes, Radius text interaction, all very sensitive to dropping bags. If there was a rate of one to two percent drop between AP and switchboard, that could be less than 80% successful.
There was a project to upgrade the teaching building, which was planned to build on existing cabling lines with WiFi certification systems and AC attached to the core switchboard without changing access. The result was that, during the uploading test, less than 60% of all AP Portal certificates were successful above three floors. Checked down, it was found that the network line over three floors was laid 15 years ago, not only not being six types of wire, but also that the oxidation level of crystals and panels was already very high. Portal page loads either white screens or half-cracked because they were retransmitted by dropping bags.
The problem with the physical layer is not solved by the WiFi certification system itself. The only solution is to switch lines. But the cost and time of switching are not a small number, and it may take one month for a teaching building to be surveyed and built. If this precondition is not taken into account when the project is set up, then the latter becomes a huge change and cost increase.
The POPE supply is inadequate, which makes AP work unstable
Another frequently overlooked problem is that of POPE power. WiFi 6 has a generally higher APA power than the previous generation, with models requiring more than 30 W in full-load launch power. But many old park access switches support 802.3 (af) standards and single ports provide a maximum power supply of 15 W. This leads AP to work under the mode of saving electricity, with RF power decreasing and signal coverage being less than designed. Users standing in an area they should have covered, with only one cell and Portal’s page not jumping out, repeatedly disconnecting the chain, seeing the same device running between authentication-failure-recertification on the side of the certification system.
Either switch, POPE power or an AP-side adjustment of the supply strategy. But either option is extra work and cost. These hidden costs are not usually found in the WiFi certification system’s programme offer, but they all come up at the implementation stage.
Space and heat radiation conditions in weak electrical cells
There is another small but annoying thing to say: the weak electric booth. The old park, after re-engineering the WiFi certification system, may have several more devices in the weak electrical room because of the AC controllers, the Radius server hardware (if not deployed virtualized), and the condenser switch.
One park area is amid the high temperature of weak electrical cells, which often reboots automatically during summer and each time restarts all AP connected to it, the user WiFi connection will be briefly interrupted and re-certified. The phenomenon observed by users is that WiFi falls at once every time, and has to be reconnected. This problem was investigated for a long time, and then placed on a temperature probe on the VED wall, finding temperatures between 2 and 4 pm and above 45 degrees.
So I'm going to go over the survey now, not only to see the web line, POPE, and the weak electric booths, but also to see whether the physical environment on site can support the WiFi certification system. The program is paper-based, but the equipment is in the middle of dust, heat, and old wire. And old buildings often have a system of access that does not meet the current standards for weak electrical connections, and during the rainy season AP is prone to being struck by lightning. This problem has been encountered in an old factory rehabilitation project, which was followed by three new tubes burned after the first thunderstorm in summer, and the search found that the underground resistance to the power wells was exceeding the standard. So in the WiFi certification system adaptation project, I strongly recommend adding to the survey list two items, an assessment of electrical distribution capacity and a feed-in system, which, although cumbersome, are much more profitable than burning up and reworking after being online.