Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL Electronics IMUX Ap-Note 15.
Proper replacement technique of a Common Module of unknown provenance
should allow for deletion of unknown configuration and loading of new,
desired parameters.
It is very important to remember that the controller for shelf management
resides within Drop-and-Insert A (or Terminal) Module. The Drop-and-
Insert B module behaves just like a Channel Module - it is controlled by DI-
A.
However, the DI-B contains a dormant Chart, possibly loaded with
configuration information of another shelf, where it may have been once
used as DI-A. Installing the DI-B module into DI-A position can bring the
very same troublesome results as installing a completely unknown one.
Only if the replacement Common Module (whether from DI-B position or
other equipment) contains a known-good configuration Chart from its
previous operation as DI-A, can the user safely assume that shelf operation
will be not affected. Even this should be verified, for example by creating a
Configuration Difference Report with NMS.
POSSIBLE PROCEDURES TO REPLACE A COMMON MODULE.
1. Using DIP-Switches.
• Prior to or following removal of original Common Module: set all
Channel Modules to local-control mode.
• Set DIP-switches to desired
configuration parameters.
• Insert new Common Module. Issue CHART RESET to remove old
entries.
• The current shelf configuration will be read into the Chart.
• Set Channel Modules to remote control, as required. They will operate
with configuration settings originally retrieved from the DIP-
switches.
2. Using NMS (Network Management Software).
• Obtain configuration file or capture existing shelf configuration.
• Insert new Common Module. Issue CHART RESET to clear undesired
old entries.
• Download configuration file into shelf.
RETAINING CONFIGURATION IN REDUNDANT
COMMON MODULE.
Redundant Common Modules contain facilities to preserve both Common
Module and Channel Module configur
ation parameters when switching
between Main and Standby Module.
If proper operational procedures
are observed, Common Modules can be
removed and replaced without loss
of configuration information.
apnote15 page: 6 of 8 rdw revised 08/30/2001 printed 11/1/2006
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