Octo WS2811 requires the DMA (Direct Memory Access) engine which is available only in Teensy 3.0 and Teensy 3.1. Please use caution when viewing large numbers of LEDs at close distance. AC mains voltage should be wired properly according to electrical codes. Fewer or shorter strips may be used, with addressing described below. Early versions of Octo WS2811 required pins 15 & 16 to be connected together. Approximately 1000 LEDs per Teensy 3.0 or 4000 LEDs per Teensy 3.2 are recommended for large LED projects, to maintain high performance.
A diffusing material in front the LEDs is usually a good idea. Octo WS2811 uses internally uses a timer, and a PWM waveform at a pin on some boards. Any number of Teensy boards may be used to support large LED arrays. The display update continues, taking 30 microseconds for for each LED, plus 50 microseconds to reset the WS2811. The Basic Test is useful to verify your LEDs work, and to find the correct color configuration. If yours have different wiring, the colors will appear in a different order.
I've accidentally cloned a 7940 config when I actually had a 7942 phone and get the "Auth Fail" message because it's trying to pull the wrong firmware.
Recently, I wanted to upgrade my test router to the latest IOS.
Then the phones reboot and come up on the previous factory firmware load on the device. Most likely this is caused by a phone running on a firmware older than 8.5(2) being upgraded to something newer.
This is a known issue, documented in the release notes for SCCP firmware release 8.5.(2)SR1: For all SCCP firmware upgrades from firmware release versions earlier than 8.3(3) to version 8.5(2)SR1 or greater, you must first upgrade your firmware to version 8.5(2).
When they are booting up, the phones attempt to upgrade via TFTP to the current firmware specified in CUCM, but they fail and display "Auth Fail" on their screen.
If you are still unable to connect, this may indicate an issue related to the network environment or wireless router being used.
and as a result you may encounter hyperlinks which no longer function.
Keep in mind that maximize router DRAM and flash memory size before IOS image upgrade is always a good idea to make sure the router can fit the IOS image file and can run any IOS image version.
Check out the following FAQ to find memory specification»Cisco Forum FAQ »Cisco equipment memory chip specification* When the router is still running the older IOS image version, backup the older IOS image to TFTP or FTP server (the next steps explain this further).