ZyXEL SBT-2112T


 * Manual •  Similar product
 * Chipset datasheet

Additional external links

 * Internal images(Teardown)

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.