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[Vigilante]

Maybe ISP grading rating. 

Guessing so 

I've found a few interesting details regarding what the MAC WIRELESS DIAGNOSTIC UTILITY is reporting (SCAN feature) vs D-LINK DIR-890L settings / D-LINK DIR-868L settings.

1)  WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-890L PROTOCOL for 2.4GHz to be '802.11b/g/n', when I have it set to only 'Mixed 802.11g/n'
2)  WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-890L PROTOCOL for 5GHz to be '802.11ac', when I have it set to only 'Mixed 802.11n/ac' (Primary 5GHz)
3)  WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-890L PROTOCOL for 5GHz to be '802.11ac', when I have it set to only 'Mixed 802.11n/ac' (Secondary 5GHz)
3)  WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-868L PROTOCOL for 2.4GHz to be '802.11n', when I have it set to only 'Mixed 802.11n/g'
4)  WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-868L PROTOCOL for 5GHz to be '802.11ac', when I have it set to only 'Mixed 802.11ac/n'

I'm not sure if this is something in regards to both routers, or perhaps the Mac WIRELESS DIAGNOSTIC UTILITY (SCAN feature) not correctly reporting the "actual" protocols.  Either way, I thought posting this might trigger some discussion.  I did run inSSIDer (yep, still have it for Mac) and unfortunately, that doesn't provide the protocol 

[FurryNutz]

What happens if you set single mode G or N on 2.4Ghz and single A mode or N mode on 5Ghz?

Hook up your 5500 or 4500 and set single mode N on both radios and test. Just turn it on and configure. No need to connect it up as a main host router. You might disable the Other wifi radios temporarily while testing the 5500/4500.

Do you have a Windows PC? if so you might try Acrylic wifi scanner. Do a search on that name. Also for Mac there is Sumbler as well. I think it sees AC mode.

[Vigilante]

What happens if you set single mode G or N on 2.4Ghz and single A mode or N mode on 5Ghz?

Still Incorrect - WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-890L PROTOCOL for 2.4GHz to be '802.11b/g/n', when I have it set to only 'Mixed 802.11n'
Correct - WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-890L PROTOCOL for 5GHz to be '802.11a', when I have it set to only 'Mixed 802.11a' (Primary 5GHz)
Correct - WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-890L PROTOCOL for 5GHz to be '802.11a', when I have it set to only 'Mixed 802.11a' (Secondary 5GHz)
Correct - WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-868L PROTOCOL for 2.4GHz to be '802.11n', when I have it set to only 'Mixed 802.11n'
Incorrect - WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-868L PROTOCOL for 5GHz to be '802.11ac', when I have it set to only 'Mixed 802.11n'

Incorrect - WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-890L PROTOCOL for 5GHz to be '802.11a/n', when I have it set to only 'Mixed 802.11n' (Primary 5GHz)
Incorrect - WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-890L PROTOCOL for 5GHz to be '802.11a/n', when I have it set to only 'Mixed 802.11n' (Secondary 5GHz)
Incorrect - WIRELESS DIAGNOSTIC UTILITY is reporting the DIR-868L PROTOCOL for 2.4GHz to be '802.11b/g', when I have it set to only 'Mixed 802.11g'
Cannot set DIR-890L to 'g' only in 2.4GHz
Cannot set DIR-868L to 'n' only in 5GHz

Not sure what is going on here......

Do you have a Windows PC? if so you might try Acrylic wifi scanner. Do a search on that name. Also for Mac there is Sumbler as well. I think it sees AC mode.

I don't have a Windows PC 

[FurryNutz]

Possible that the app is reading the capabilities of the router entirely or the app is not reading the modes correctly or the router is responding incorrectly.

Can you test on the 5500 and 4500 and see?
See if you can find Stumbler for Mac.

[Vigilante]

See if you can find Stumbler for Mac.

Found, downloaded, and installed iStumbler for Mac.  It actually provides MORE information than the Mac Wireless Diagnostic Utility.

Unfortunately, I'm seeing the exact same results reported in the iStumbler app as I was in the Mac Wireless Diagnostic Utility app [in regards to incorrect PROTOCOLS being reported vs what is set within the router(s)] 

Can you test on the 5500 and 4500 and see?

I will test with the 5500 and see what both iStumbler and the Mac Wireless Diagnostic Utility app report....stay tuned    Any chance of contacting D-LInk and see what they say about the issue?

[FurryNutz]

Let us know. I will.

[FurryNutz]

Also, to see what the Mac is actually connecting at, hold down the Opt button then left or right click on the Wifi signal icon on the top tool bar. This will reveal more info. Check the connection rate for single modes on each mode and see what the Mac is connecting at. ###mb is what your looking for.

[Vigilante]

Also, to see what the Mac is actually connecting at, hold down the Opt button then left or right click on the Wifi signal icon on the top tool bar. This will reveal more info. Check the connection rate for single modes on each mode and see what the Mac is connecting at. ###mb is what your looking for.

I'm assuming this is the info you were referring to..... 

27" Apple iMac - Wi-Fi connection
Active PHY Mode - 802.11ac
Quality - Excellent
RSSI - -66dBm
Noise - -101dBm (interestingly, SCAN shows '0' for noise)
Tx Rate - 351Mbps
Channel - 44
Channel Band - 5 GHz
Channel Width - 80 MHz

  I actually realized I didn't have CHANNEL WIDTH set to Auto 20/40/80 MHz after troubleshooting the different settings    The above info was edited after resetting CHANNEL WIDTH and obtaining new INFO from the Mac WIRELESS DIAGNOSTIC UTILITY

15" Apple MBP - Wi-Fi connection
Active PHY Mode - 802.11ac
Quality - Excellent
RSSI - -45dBm
Noise - -95dBm (interestingly, SCAN shows '0' for noise)
Tx Rate - 600Mbps
Channel - 44
Channel Band - 5 GHz
Channel Width - 80 MHz

[FurryNutz]

Ok, now set single mode g on 2.4Ghz and A on 5Ghz and report your findings...

[Vigilante]

Ok, now set single mode g on 2.4Ghz and A on 5Ghz and report your findings...

27" Apple iMac - Wi-Fi connection
Active PHY Mode - 802.11a
Quality - Excellent
RSSI - -66dBm
Noise - -99dBm (interestingly, SCAN shows '0' for noise)
Tx Rate - 48Mbps
Channel - 44
Channel Band - 5 GHz
Channel Width - 20 MHz

The D-Link DIR-890L does not have 'single g mode' for 2.4GHz (only n, g/n, b/g/n)

[FurryNutz]

So when using A mode, is this the same result seen in the two apps?

Then set G/N mode on 2.4Ghz.

The higher number for Dbm the lower the noise.

[Vigilante]

So when using A mode, is this the same result seen in the two apps?

Then set G/N mode on 2.4Ghz.

The higher number for Dbm the lower the noise.

My only option was to set 'g/n' mode  . Both apps [Wireless Diagnostic Utility and iStumbler] reported the same result using 'a' mode.

[Vigilante]

What's "odd" is both apps report consistent / same results for both DIR-890L and DIR-868L.  Maybe I shouldn't have noticed / come across  this issue 

[FurryNutz]

And setting G/N mode on 2.4Ghz, what do all three apps report? same thing?

[Vigilante]

And setting G/N mode on 2.4Ghz, what do all three apps report? same thing?

Yes.  Both iStumbler and the Mac Wireless Diagnostic Utility report the same results.