Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
The switch must remain in AUTO position to allow automatic operation or to accept forced-switch
configuration.
The redundant-swap control process resides on the module in the Standby slot. The setting of the slide
switch on the Main Module is irrelevant.
In redundant-mode operation, switch settings are not checked during the initial boot period. Once the
module is powered up and stabilized, as indicated by the BOARD OK indicator no longer blinking, it
will accept the current slide switch setting.
There is one exception to this. If the Standby Module is inserted and powered up with a switch already
in the MAIN or STBY position, that setting goes into effect immediately. This insures that a module
being plugged in does not cause undesired operation. Refer to description of procedure to replace a
module for an example of utility of this feature.
3.1.7.2 Forced-switch configuration parameters.
The CM4 Common Module can be configured to forcibly activate either of the modules or to allow
automatic operation. This configuration parameter is entered through the front-panel alphanumeric
display or over network management link.
The Configuration parameter is handled by the firmware controlling the CM4, unlike the front-panel
switch which forces actions on the hardware level.
The configuration setting works similarly to the front-panel slide switch, but has a lower priority. The
slide switch, forcing either the Main or Standby to be active will override any forced configuration
parameter settings. As a result, the front-panel slide switch and the firmware configuration parameter
must both be set to AUTO to permit automatic operation.
Just like the front-panel mode slide switch, a forced configuration will override any other
consideration, such as if the desired active module is operating properly or whether it even exists.
Unlike the front-panel mode slide switch, operational only on Standby, the forced configuration is
programmed into the currently active module, either Main or Standby, making this process transparent
to the user.
Since it is handled through a parameter, the software-driven forced switchover is delayed by about 30
seconds after the command is issued. This allows time to update the mirror configuration tables of the
inactive Common Module.
The forced-switch configuration parameter is accessed through the alphanumeric front-panel display
within the “SWCH” group. The allowed selections are “MAIN” (activate Main Module), “STBY”
(activate Standby Module) or “AUTO” (allow automatic operation). See Table 2-8 and Figure 2-22.
An equivalent selection can be made via NMS by setting the SWITCH parameter.
IMUX 2000E1 RFL Electronics Inc.
January 23, 2004 3-10 (973) 334-3100
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