As indicated in my previous post, DIR-880L is an A1 build with SEAsian version. As for the PC, using Lenovo ThinkPad X61 with dual/MIMO 802.11n support.
Since its inSSIDer result shows 300Mbps on both 636L (HT 20 only) and 655 (HT 20/40) connection, I'm wondering why 880L connection is limited to 216Mbps only. Same thing was also reported to ACER and HP laptop PCs.
I reported that F/W v1.05b01 was able to sustain HT 20/40 broadcast thus enhancing the speed theoretically to 450Mbps, 1.05b02 always resorted to
20MHz only. No additional connection nor change of location of WiFI is concerned. I'm aware of 600Mbps H/W requirement but the question here is the constant single channel ID broadcasting, thus 216Mbps is set. I've been using a hidden SSID ever since. About the SSID of other access points, 636L and 655 have different SSIDs with fixed but different channel allocation. Even if 636L and 655 WiFI are disabled, 880L 1.05b02 can't establish the 40 width. There is a big difference in transferring files within the LAN, specially the DCS camera recording being copied to NAS.
About the tech support, called but they're unaware of the said problem but they usually suggest possible interference from neighbors or other gadgets or appliances affecting the allocation. Did downgrade last night to 1.05b01 and again 880L can achieve HT 20/40 even when all WiFi routers are running.
Don't know how to report this so I hope that other 880L users and this forum could provide some answers.
Thanks and hope to hear some feedback.
What is the Mfr and model if the client HW that your using on 2.4Ghz?
Ensure that this device support 600Mb connection rates one 2.4Ghz. Some devices don't. There will be 300, 450 and 600Mb connection rates seen on 2.4Ghz however again it depends on what the devices supported by the Mfr.
It's always best to keep SSID names different on each radio. However when Smart Connect is enabled then it should handle what devices connects to what radio automatically.
I recommend that you phone contact your regional D-Link support office and ask for help and information regarding this. Reference this thread to them. We find that phone contact has better immediate results over using email.
Let us know how it goes please.