Restart & Factory Reset

The MGU2 can be restarted by different sources:

HW Reset Button
HW Reset Button factory reset mode
HW Watchdog
MX-ONE Service Node

The MGU2 has an external button (hole in the front) to make a HW reset of the board.

When the reset button is pressed and released, the reset line to the Device Processor (DP) is pulled which causes an immediate restart of the DP and reboot of SW.

Pressing the Reset button on the front of the Media Gateway for 5 seconds will reset your Media Gateway to its factory default factory settings. When the reset button is pressed the Ethernet's LAN port LEDs are starting to flash and after 5 seconds the LEDs are changing to fixed green light, to give the operator a hint when the factory reset takes place. Any earlier settings on the Media Gateway will be erased. For default parameters settings, see Table 1.

Note: Using HW reset on a running live system reset should only be used as a last resort, since there is a risk of corrupting flash file system and/or configuration data.

During normal operation, the Device processor regularly restarts the watchdog timer to prevent it from elapsing, or "timing out".

If, due to a hardware fault or program error, the DP fails to restart the watchdog, the timer will elapse and generate a Hardware reset (restarting the HW) to try to get the MGU2 in a reset state and restoring normal system operation.

A watchdog indication in the NOR Flash (NV-parameters) shows the latest state of the watchdog after a HW restart.

The are 2 states:

Watchdog normal
A normal reset has occurred on the MGU2 which means that the software or an operator has invoked the reset. The restart is logged (for trace analysis) in the linux syslog if the restart is ordered by the MX-ONE Service Node.
Watchdog timed out
The watchdog timer has elapsed causing a HW reset.

To supervise SW and HW execution there is a HW Watchdog on the MGU2.

MX-ONE Service Node
The MX-ONE Service Node can send media gateway restart message which will cause a HW reset on the MGU2.

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