AT&T DEFINITY 7100 series Manual de usuario descargar pdf (Pagina 64)

CONTROL CIRCUIT PACKS

Duplication Interface TN772 (G3iV2)

Selects the active processing element (control complex) in a dupli-

cated system and coordinates the interchange of processing ele-

ments. Controls and provides the memory shadowing function with

the duplication option. Terminates the environmental sensors and

controls the integrated battery supply and charging circuits. Selects

the active tone-clock circuit pack. Provides the G3-Management

Terminal interface in place of the processor. A second Duplication

Interface circuit pack resides in the duplicated control

carrier/cabinet. It requires a cable connection to the Duplication

Interface circuit pack in the basic control carrier/cabinet.

Duplication Interface UN330B (G3rV2)

In a duplicated system, which has two switch processing elements

(SPEs), one UN330B resides in each SPE and is connected to the

other UN330B. These provide control and communication paths

between the SPEs to keep the redundant standby (inactive) SPE

ready to assume control of the active SPE fails. The UN330Bs pro-

vide the following functions:

●

Selects active/standby mode for the two SPEs

●

Shadows (copies) the active SPE’s memory writes into

the standby SPE memory

●

Supports inter-SPE communication such as two-way

general purpose mailbox

Memory shadowing is a bidirectional high-speed path between the

two SPEs. When memory shadowing is activated, all shadowed

memory writes on the active processor's bus are sent across the

link and written into the standby processor's memory. Standby

memory writes are not sent to the active processor.

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AT&T DEFINITY 7100 series Manual de usuario Pagina 64