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Page 32 of 66
DTI installation
Replacing a Clock Controller
Installing a Clock Controller
Starting the Clock Controller
553-2811-200 Standard 6.0 December 1994
Step 2 in the following procedures
how to replace a card.
Do not disable an active clock or a clock associated with an active CPU.
Be sure to inspect the Clock Controller card before installing it. Refer to the
tables earlier in this chapter for shelf, slot, and switch setting information.
Remember not to use both the QPC471 and the QPC775 on a single system.
QPC471 vintage H cards cannot be mixed with cards of an earlier vintage.
The Clock Controller, when first enabled, is in free run mode. It stays in this
mode for several minutes before being switched to tracking mode. Manual
intervention via LD 60 can force the Clock Controller to remain in a
particular mode.
For the earlier QPC471 vintages, up to 20 minutes may pass before the clock
actually locks and tracks. The QPC471 vintage G and H cards begin tracking
within five minutes.
("Installing a Clock
Controller") explains
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