User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1482TONE-BD (Tone-Clock Circuit Pack)
10
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.