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9.3
DHCP Enable/Disable
The 922-DSLH uC DIAG can obtain its IP address by using the Dynamic Host Configuration Protocol (DHCP).
This feature can be enabled or disabled through the Telnet interface.
If this feature is enabled, then on power up the card sends a DHCP query and waits up to the duration of the
DHCP timeout for a valid response. On receipt of a valid response from a DHCP server, the address specified
by the DHCP response is used as the IP address.
If the card fails to receive a valid DHCP response within the configured timeout period, then the static IP address
saved in the EEPROM is used as the IP address. If the EEPROM access were to fail, the card uses the address
192.168.0.100 as its IP address. It is important to note that by default the DHCP functionality is enabled
and the DHCP timeout is 60 seconds.
DHCP is enabled by sending one of the following commands through the Telnet interface, "dhcp on short" or
"dhcp on long". These commands will enable DHCP with a timeout of 60 or 120 seconds respectively. DHCP is
disabled by sending "dhcp off".
9.4
Software Reset
A soft reset can be applied to the 922-DSLH card by sending the reset command from the Telnet menu.
Note that any changes to the Ethernet switch configuration made prior to the reset will be lost and the
Ethernet switch will start up with the default Ethernet switch configuration.
9.5
Watchdog Reset
The 922-DSLH card has a built in watchdog timer which is used by the processor to trigger a watchdog reset in
case of a software lock up. The exact timing parameters of the watchdog reset are beyond the scope of this
document.
9.6
Automatic User Switch Configuration Loading
The 922-DSLH can automatically load the user-defined Ethernet switch configuration already saved in
EEPROM. This functionality can be enabled or disabled through the Telnet interface by sending a "scfg on" or
"scfg off" command. If this feature is enabled, then on power-up the card loads the "User Ethernet Switch
Configuration" from the EEPROM after ~40 seconds.
Note that this feature is disabled by default and the user has to make sure that they save a valid copy
of the switch configuration in the EEPROM before enabling this functionality. Failure to do so may
result in loss of connectivity to the card.
Focal Technologies Corporation
A Moog Inc. Company
Model 922-DSLH – User Manual
Document No. 922-0677-00, Rev 1.0
Page 9-2
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