The aim of the board is to improve the performance of the WR Switch
using an external PLL and a new VCTCXO.
A prototype of this board has been tested successfully, however the
prototype lacks in terms of flexibility, since it requires external
hardware to make it works. The board is intended to be mounted inside
the switch, using the installed 12V power supply of the WRS.
The board has a new external 10 MHz input, to be used instead of the
current 10 MHz input when configured as Grand Master. The improvements
are also effective when configured as boundary, thanks to the new
The proposed board can be installed in any PCB v3.3 and v3.4 versions of
the switch. The following steps are required to install the board inside
Soldering of the SMI link connector: this can be easily done with an
hot air-gun. Three switches have been modified with 100% sucess rate
Remove of the VM53S3 oscillator and install of an U.FL connector
Files for schematic review
Attached the files for the review
The schematic has been updated due to a wrong symbol, page 6 (PLL).
The change does not affect any other sheet.