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 heal thy is active at any given time.

This is

independent of the SPE Duplication st rategy

, in the sense that the active
Tone-Clock circuit pack need n ot change with an interchang e of SPE carriers.
Rather, except for the effect of the manual interven tion discussed earlier,
Tone-Clock interchanges occur only as a result of changes in the health of
Tone-Clock circuit packs, as perc eived by maintenanc e software. When both
Tone-Clock circuit packs are equall y healthy, no preference is given to one over
the ot her, r egar dles s of w hich SPE carr ier i s act ive.
It is possible to manually c ontrol Tone-Clock interchanges in three ways.
1. The standby Tone-Clock circuit p ack may be made una vailable for most
purposes by using the busyout tone-clock UUC command. Such a
Tone-Clock may not be selected with console c ommands, nor with normal
maintenance software activities, until it has b een made available ag ain
with the restore tone-clock UUC command.
NOTE:
busyout tone-clock is not allowed for active Tone-Clock circui t
packs.
2. The SPE p roc esso r loc k swit che s may b e us ed to forc e a pa rtic ular SPE to
be active.

This method overrides all other Tone-Clock interchange

controls

. If there is a Tone-Clock circuit pack in the same c arrier as the
active SPE, it will become active, reg ardless of its health. If the Tone-Clock
circ uit p ack in th e sele cte d SPE was in the

busyout

state (see item 1
above), it will automatically b e released and made ac tive. While the lock
switches are set for a partic ular carrier,

no manual intervention or software

error detection

will cause an interchange of Tone-Clocks; the Tone-Clock
circuit pack i n the standby SPE carrier can never b ecome active. If there is
no Tone-Clock circuit pack in the selec ted SPE at the time the switches are
set, but one is later installed, the system will interc hange 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 occ ur

; the system will have no active
tone-clock. When the lock switc hes are restored to the neutral position, a
tone clock interchang e will occur only if the stand by Tone-Clock circuit
pack is healthier than the active o ne.
3. A particular Tone-Clock circuit pack can b e 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 ac tive one, no interchange will
occur unless the override optio n is specified; without it a message will
inform the user that it is required.
Once a Tone-Clock circuit pac k is made active by th e set tone-clock UUC
command, it will stay acti ve until either the set tone-clock UUC command
is issued again to make the other c ircuit pack ac tive, or until a fault occurs
in the active Tone-Clock circuit pac k, which causes the system to
interchange Tone-Clocks.