ZyXEL SBT-2112T


 * Manual •  Similar product
 * Chipset datasheet

Teardown

 * Teardown (internal images)

Serial
On the left of the main chipset, it have a presoldered serial pins, that have
 * the next configuration(from up to down): Ground, TX, RX and 3.3V.
 * The port have a standard configuration with 115200 bauds.

For skip the autoboot, keep pressing ESC until it finish the boot up.