Multitech MultiVOIP MVPGK1 Gatekeepers, Hardware User'S Manual

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MultiVOIP Gatekeeper User Guide
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Appendix C - SBC Configuration Details
Appendix C - SBC Configuration Details
Flash BIOS Update
BIOS updates are revised versions of the BIOS that have been modified to remedy known bugs. When
necessary, use the program “Awdflash.exe” on your System CD-ROM to update the system BIOS and
the VGA BIOS. Check periodically with MultiTech to see if a new flash BIOS update is available.
Watchdog Timer Configuration
The watchdog timer does not run constantly. It must be started in DOS Debug mode or from another
application program, customized for this purpose, that runs on the system. The watchdog timer is
especially useful for remote rebooting of the PC.
The watchdog timer is defined at I/O port
0443H . To enable the watchdog timer, write I/O port
0443H , then the system will reset itself. To disable the function, write I/O port 0441H and the system
will stop the Watchdog timer.
Since the timer’s intervals have a tolerance of 25%, you should specify that the timer be refreshed
about once every second. To program your watchdog timer, follow these steps:
Watchdog enable program:
MOV
AX, 000FH (choose the values you need; start from 0)
MOV DX, 0443H
OUTDX, AX
Watchdog disable program:
MOV
AX, 000FH (this value can be ignored)
MOV DX, 0441H
OUTDX, AX
The Watchdog Timer control table is as follows:
Level Value Time/sec Level Value Times/sec
1 F 0 9 7 16
2 E 2 10 6 18
3 D 4 11 5 20
4 C 6 12 4 22
5 B 8 13 3 24
6 A 10 14 2 26
7 9 12 15 1 28
8 8 14 16 0 30
Green PC Function
The Gatekeeper is equipped with a “green function” that enables it to operate using reduced electrical
power when the machine is inactive. When in green mode, the Gatekeeper slows down and shuts down
certain computer functions in order to reduce power consumption. There are three reduced-power
operating modes (presented in order of increasing power savings):
(1) CPU Doze Mode,
(2) System Standby Mode,
(3) System Suspend Mode .
By default, however, the green function is turned off.