User guide

18 User Guide
Reset Push Button
A small RESET push button is located on the front panel of the “redundant twister”.
When used in conjunction with the unit’s SW and SECONDARY LEDs, and the
AUTO DIP switch setting, this push button allows a network administrator to
effectively maintain or troubleshoot a PRIMARY link connection.
Because of its small size and recessed placement within the front panel, press the
RESET push button with the tip of a pointed object. Pushing and holding the RESET
push button has no effect. It is the act of pressing the push button that causes a reset.
In the event of a PRIMARY link failure, pressing the RESET push button has the
following effect:
If the AUTO switch is UP The active port automatically reverts
and RED switch is UP to PRIMARY when primary link is
reestablished and pressing the RESET
switch clears the SW LED.
If the AUTO switch is DOWN The active port does not automatically revert to
and RED switch is UP PRIMARY when a primary link is reestablished.
Pressing the RESET switch clears the SW LED
and the SECONDARY LED and forces the PRI-
MARY port to be the active port. If the
SECONDARY link is disabled, it reverts to the
PRIMARY if the PRIMARY has a good link.
If there is only a SECONDARY link, then the
SW and SECONDARY LEDs remain illumi-
nated and pressing the RESET switch has no
effect.
If the RED switch is DOWN The unit operates in Network Select Mode
(NSM). The RESET push button toggles the
active link between the PRIMARY and
SECONDARY ports. Note that the SW LED
remains off during Network Select Mode (NSM)
operation.