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TONE-BD (Tone-Clock Circuit Pack)
Issue 4 May 2002 10-1785 555-233-123
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 PC 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 PC 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 PC [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 PC
command, it will stay active until either the set tone-clock PC 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.