DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1780TONE-BD (Tone-Clock Circuit Pack)
9
Manual PPN Tone-Clock Interchange
In a PPN with more than one Tone-Clock circuit pack, the intention is to assure
that the one considered most healthy is active at any given time.
This is
independent of the SPE Duplication strategy
, in the sense that the active
Tone-Clock circuit pack need not change with an interchange of SPE carriers.
Rather, except for the effect of the manual intervention discussed earlier,
Tone-Clock interchanges occur only as a result of changes in the health of
Tone-Clock circuit packs, as perceived by maintenance software. When both
Tone-Clock circuit packs are equally healthy, no preference is given to one over
the other, regardless of which SPE carrier is active.
It is possible to manually control Tone-Clock interchanges in three ways.
1. The
standby
Tone-Clock circuit pack may be made unavailable for most
purposes by using the
busyout tone-clock UUC
command. Such a
Tone-Clock may not be selected with console commands, nor with normal
maintenance software activities, until it has been made available again
with the
restore tone-clock UUC
command.
NOTE:
busyout tone-clock
is not allowed for active Tone-Clock circuit
packs.
2. The SPE processor lock switches may be used to force a particular SPE to
be active.
This method overrides all other Tone-Clock interchange
controls
. If there is a Tone-Clock circuit pack in the same carrier as the
active SPE, it will become active, regardless of its health. If the Tone-Clock
circuit pack in the selected SPE was in the
busyout
state (see item 1
above), it will automatically be released and made active. While the lock
switches are set for a particular carrier,
no manual intervention or software
error detection
will cause an interchange of Tone-Clocks; the Tone-Clock
circuit pack in the standby SPE carrier can never become active. If there is
no Tone-Clock circuit pack in the selected SPE at the time the switches are
set, but one is later installed, the system will interchange to it regardless of
its health. If the Tone-Clock circuit pack is removed from an SPE while the
switches are set,
no interchange will occur
; the system will have no active
tone-clock. When the lock switches are restored to the neutral position, a
tone clock interchange will occur only if the standby Tone-Clock circuit
pack is healthier than the active one.
3. A particular Tone-Clock circuit pack can be made active by issuing the set
tone-clock UUC [override] command. If the Tone-Clock to be made
active is less healthy than the currently active one, no interchange will
occur unless the override option is specified; without it a message will
inform the user that it is required.
Once a Tone-Clock circuit pack is made active by the set tone-clock UUC
command, it will stay active until either the set tone-clock UUC command
is issued again to make the other circuit pack active, or until a fault occurs
in the active Tone-Clock circuit pack, which causes the system to
interchange Tone-Clocks.
