60 097-55501-01 Issue 6 – June 2003
1
TimeHub 5500 System Guide
To handle this, a TL1 keyword was created: ECLKEXP. This keyword is
detailed in the TL1 manual, but it essentially works as follows:
• By default, the software in the TimeHub master shelf does not
expect that an expansion shelf is intended to be part of the
configuration. Hence no expansion shelf-related events will be
reported.
• However, the software in the master shelf continually attempts to
connect to an expansion shelf. If a communication response ever
occurs from any expansion controller card then that card is
automatically set to be expected (the value of ECLKEXP for that
particular card is set from N to Y). This enables any future
communication problems with that card to be automatically
reported. For a typical expansion shelf configuration, there will be
two expansion controller cards, both of which will be detected by
the master shelf and thereafter expected to be present.
• Suppose one of the expansion controller cards is then removed. An
event (keyword EXCLKGONE) will be reported indicating that this
expected card is missing. If the card is returned, the event will be
cleared.
• As described previously, the TimeHub master shelf automatically
sets expansion shelf expectations whenever communication occurs
with an expansion controller card in a given expansion shelf.
TimeHub will never automatically remove this expectation.
However, the user can remove the expectation by explicitly setting
the value of ECLKEXP to N (for the targeted EC card). If
communication is still occurring with this card when the user sets
it to N, it will immediately be set back to Y. On the other hand, if
the card is actually removed (for example, expansion shelf is being
removed from the setup) then the setting will remain as N and any
events associated with the expansion card will be cleared.
• If the user wants to manually set the expectation that there should
be an expansion shelf (even though there currently may not be
one), the ECLKEXP setting can be set to Y. Events associated with
that expansion card will then be reported.
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