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Recently, there have been some discussions on Facebook about waining support for 2.4GHZ . KP Performance recently published a Future of 5GHZ and beyond blog post. So why all this focus on 5GHZ and why are people forgetting about 2.4?
To answer this question, we need to update our thinking on the trends in networks, not just wireless networks. Customers are demanding more and more speed. Network backbones and delivery nodes have to be updated to keep up with this demand. For anything but 802.11 wifi,2.4GHZ can’t keep up with the bandwidth needs.
One of the significant limitations of many 2.4 radios is they use frequency-hopping spread spectrum (FHSS) and/or direct-sequence spread spectrum (DSSS) modulation. Due to 2.4GHZ being older, the chipsets have evolved around these modulation methods because of age. When you compare 2.4GHZ to 5GHZ radios running OFDM, you start to see a significant difference. In a nutshell, OFDM allows for higher throughput. If you want to read all about the differences in the protocols here ya go: http://www.answers.com/Q/Difference_between_ofdm_dsss_fhss
Secondly, is the amount of spectrum available. More spectrum means more channels to use, which translates into a high chance of mitigating interference. This interference can be self-induced or from external sources. To use an analogy, the more rooms a building has, the more simultaneous conversations can happen without noise in 2.4GHZ we only have 3 non-overlapping channels at 20mhz. Remember the part about more and more customers wanting more bandwidth? In the wireless world, one of the ways to increase capacity on your APs is to increase the channel width. Once you increase 2.4 to 30 or 40 MHz, you do not have much room to deal with noise because your available channels have shrunk.
One of the biggest arguments in support of using 2.4GHZ for a WISP environment is the physics. Lower frequencies penetrate trees and foliage better. As with anything, there is a tradeoff. As the signal is absorbed, so is the available “air time” for transmission of data. As the signal travels through stuff, the radios on both sides have to reduce their modulation rates to deal with the loss of signal. Lower modulation rates mean lower throughput for customers. This might be fine for customers who have no other choice. This thinking is not a long term play.
With LTE especially, traditional thinking is being uprooted. Multiple streams to the customer as well as various paths for the signal due to antenna stacking are allowing radios to penetrate this same foliage just as well as a 2.4 signal, but delivering more bandwidth. These systems are becoming more and more carrier class. As the internet evolves and becomes more and more critical, ISPs are having to step up their services. The FCC says the definition of broadband is at least 25 meg download. A 2.4 radio just can’t keep up in a WISP environment. I am seeing 10 meg becoming the minimum customers want. Can you get by with smaller packages? Yes, but how long can you maintain that as the customer demand grows?
So what is the answer? Cell sizes are shrinking. This is helping 2.4 hold on. The less expensive radios can be deployed to less dense areas and still provide decent speeds to customers. This same trend allows 5GHZ cells to be deployed as well. With less things to go through, 5GHZ can perform in modern networks at higher modulation rates. Antenna manufacturers are also spending R&D to get the most out of their 5GHZ antennas. More money in the pipeline means stronger products. My clients are typically deploying 3.65 and 5GHZ on their towers. LTE is changing RF WISP design and taking the place of 2.4 and 900.
Back in January of 2018, FCC Chairman Ajit Pai announced a proposal that could have allocated over $500 million toward the development of rural broadband internet lines. At the time, Pai said that closing the “digital divide” between rural and urban broadband was the FCC’s “top priority.
Broadband is expected to be part of the $2 trillion spending plan on infrastructure that President Donald Trump agreed to in a meeting with Democratic leaders.
On Tuesday, Trump met with House Speaker Nancy Pelosi and Senate Minority Leader Chuck Schumer at the White House to begin discussions about a new infrastructure spending plan.
More than 106,000 rural homes and small businesses in 43 US states will get access to 25Mbps broadband at some point in the next decade thanks to a Federal Communications Commission policy change.
There are now 26 states with laws on the books that either roadblock or ban outright municipally-owned broadband networks
iPhone X while sitting in traffic on the west side of Indy.