sfx2000
Part of the Furniture
It's a slow afternoon...
Ever wonder why we don't normally use 12 and 13 here in the US - within constraints, it used to be possible for unlicensed use - having 12 would actually be useful in some considerations. Recall the 1/6/11 non-overlapping channels in 2.4 - that's actually when using 11b only - with g/n/ax, we can get away with using 1/4/8/12 - which would open up 25 percent more capacity a multiple AP deployment, if channels 12 and 13 were allowed to operate at the same levels as Ch 1-11
The main reason why we can't use them is GlobalStar, a Low Earth Orbit wireless provider (similar to Iridium) - they have sole use as the license holder for the 2483.5 MHz to 2495 MHz, which is normalized as LTE Band 53 (and 5G NR53) - they're deploying this as TLPS (Terrestrial Low Power Service), and they are using this as an anchor so that they can get some traffic off the satellites - also, they can offer it up as roaming footprint* for other LTe/5G carriers, and Qualcomm's most recent wireless chipsets include B53/NR53 as a supported band.
* roaming services are likely the real reason, in my opinion, as this can be extremely profitable for GlobalStar, much more so than getting revenue traffic from their own limited number of subscribers
Just as a reminder - WiFi Channels 12, 13, 14 in the ISM band... Ch 14 is only in Japan, and OFDM is not allowed in that channel there.
Because of spectrum mask rules set in Part 15, which govern WiFi, Bluetooth, and other unlicensed radios - Channel 11 is the limit these days, as they can potentially interfere with the license holder in Band 53. LTe/5G, paradoxically, is allowed to leak over into Band 11, and there, if a NodeB (cell site) is near by, can impact the 802.11b/g/n/ax channel 11 link budget by up to 20 dB - which is enough to impact WiFi use in that band.
Anyways, for some, this is old news...
For the rest - now you know...
(and now I know how to post tables in XenForo, which might come in handy some day)
Ever wonder why we don't normally use 12 and 13 here in the US - within constraints, it used to be possible for unlicensed use - having 12 would actually be useful in some considerations. Recall the 1/6/11 non-overlapping channels in 2.4 - that's actually when using 11b only - with g/n/ax, we can get away with using 1/4/8/12 - which would open up 25 percent more capacity a multiple AP deployment, if channels 12 and 13 were allowed to operate at the same levels as Ch 1-11
The main reason why we can't use them is GlobalStar, a Low Earth Orbit wireless provider (similar to Iridium) - they have sole use as the license holder for the 2483.5 MHz to 2495 MHz, which is normalized as LTE Band 53 (and 5G NR53) - they're deploying this as TLPS (Terrestrial Low Power Service), and they are using this as an anchor so that they can get some traffic off the satellites - also, they can offer it up as roaming footprint* for other LTe/5G carriers, and Qualcomm's most recent wireless chipsets include B53/NR53 as a supported band.
* roaming services are likely the real reason, in my opinion, as this can be extremely profitable for GlobalStar, much more so than getting revenue traffic from their own limited number of subscribers
Just as a reminder - WiFi Channels 12, 13, 14 in the ISM band... Ch 14 is only in Japan, and OFDM is not allowed in that channel there.
| 11 | 2451 - 2473 | 2462 | Global |
| 12 | 2456 - 2478 | 2467 | Africa, Asia & Europe |
| 13 | 2461 - 2483 | 2472 | Africa, Asia & Europe |
| 14 | 2473 - 2484 | 2482 | Japan |
Because of spectrum mask rules set in Part 15, which govern WiFi, Bluetooth, and other unlicensed radios - Channel 11 is the limit these days, as they can potentially interfere with the license holder in Band 53. LTe/5G, paradoxically, is allowed to leak over into Band 11, and there, if a NodeB (cell site) is near by, can impact the 802.11b/g/n/ax channel 11 link budget by up to 20 dB - which is enough to impact WiFi use in that band.
Anyways, for some, this is old news...
For the rest - now you know...
(and now I know how to post tables in XenForo, which might come in handy some day)
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