April 6th, 2011

Just a few quick update notes and then I’ll let you be on your way! I have finally received my Notion Ink Adam I do like it just as much as I thought I would, especially after replacing the stock rom! I have already put up 3 posts in regards to my Adam, so be sure to check them out. It appears that all of my hardware is fully functional and without defects, although I have not yet tried a video recording. Everything looks perfect! (except the screen protector, which I screwed up when I put on my Adam! Pics are up on the gallery post)

Also, I’ve been messing around with my home wifi settings and noticed some things (some of these I already knew, but I’m posting them, as I have not previously, or stated something different previously). I have a Cisco e3000 dual band 802.11n router with four 1GB Lan ports, and a USB port that I can attach a USB stick or USB harddrive to and access from the internet via ftp (very awesome and super cool!), I have a 16GB SanDisk Cruzer thumb drive attached right now, it supports user creation, passwords, and even security groups!

  1. apparently my Cisco e3000 Router powers cycles the 5GHz frequency prior to powering on the 2.4GHz frequency
  2. sometimes when resetting my router, I have to turn off wireless networking on my Android devices, then turn it back on or they won’t see the network
  3. It appears that the amount of time between restarting my wireless on the router and when it becomes available to devices is equal to the Beacon interval multiplied by the DTIM interval.
  4. My HTC Evo 4G does NOT support 5GHz 802.11n, only 2.4GHz (does not even see the 5GHz network I have), apparently the HTC Evo networking chip (bcm4329), not only comes in two models, one with dual band 2.4GHz & 5GHz and one without, is the same one in the Nexus1, Droid Incredible, GTab, iPhone 3GS & 4, iPod Touch, and iPad1 (who knows what else it is in!), and is a SoC with 802.11b/g/n 2.4GHz, BT 2.1, and FM transceiver, I wonder if anyone has gotten the iPhone4 to do FM yet?
  5. My Google Chrome OS cr-48 netbook does do 802.11n 5GHz.
  6. My Notion Ink Adam does not do 5GHz, it only does 2.4GHz 802.11b/g/n
  7. As I’ve said, I’ve been messing with some of my network settings (specifically on my router) and I have found that a DTIM Interval setting of 6 on my 5GHz 802.11n settings works with my cr-48 Chrome OS netbook, but upping it to 7 causes intermittent connection issues. Changing the DTIM interval to 5 on the 2.4GHz b/g/n network works with my HTC Evo and Lenovo ThinkPad T410, but not the Notion Ink Adam which fails to connect to the network at all. The HTC Evo has sporatic issues connecting and maintaining that connection when the DTIM is set to 7, hopefully there is a hack out there that will let me enable the 5GHz wifi n (if possible) on the Evo, so I can switch it over to the 5GHz network and take advantage of the increased DTIM setting. On a side note, some research I did while working on this, here is a great document on understanding wifi network traffic, latency, roaming/multiple APs, and bandwidth overhead (actually a document on optimizing wifi for VOIP). This Cisco router’s documentation has some good descriptions of the wireless settings.

    Ok, so I’ve learned a few things while I was typing this and made some more modifications, previously I was using a 20,000 millisecond beacon time with those DTIM settings that is why I was having connectivity issues, I have tried to figure out the maximum time between DTIM packets and maintain a steady signal between all of my devices (to decrease sleep mode battery drain when wifi is active) as part of my experiments to improve my Notion Ink Adam battery life (currently between 8 and 12 hours of normal+ use or 20-36 hours of minimal use).

    Below are the settings I’ve tried and the results I have received from each

    Beacon DTIM time result
    2000 6 12sec stable connection -4
    1500 7 10.5sec connection loop -5
    1500 10 15sec connection loop -5
    3000 10 30sec connection loop -5
    6000 10 1min mostly stable
    6100 10 1min 1sec connection loop -2
    6600 10 1min 6sec connection loop -3
    7000 10 1min 10sec connection loop -3
    9000 10 1min 30sec connection loop -1
    12000 10 2min connection loop -2
    24000 10 4min connection loop -1

    1 – Evo stays connected for about 3 minutes before looping, Adam fails to maintain connection during obtaining IP Address
    2 – Neither the Adam or the Evo can successfully make a connection
    3 – Evo stays connected (tested 10 mins) without dropping, Adam fails to maintain connection during obtaining IP Address
    4 – both my Evo and my Adam stay connected (tested 10 minutes) without dropping and I tested my Samsung moment with the same results
    5 – the Evo stays connected and the Adam sometimes connects, then drops and won’t reconnect
    *note – I have deleted many of the numbers I tested leaving only a few behind; however I left all of the entries marked with a “-1” as it is note worthy to look into a pattern.
    **double note – I killed a 100% battery charge on my Notion Ink Adam in about 4 hours testing this…

    even set at 6000 and 10 I am still having connection issues with my Notion Ink Adam, it will connect, but only the “first time” after each power on. If it loses the signal for any reason it refuses to reconnect and continues the connection loop issue. So right now I am just going to leave things that way and see how it goes for a few days.

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