Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6
Overview
555-231-208
Issue 1
April 2000
Introduction
2-15Reliability and recoverability
2
Reliability and recoverability
Much of the system’s reliability and recoverability can be attributed to the switch
architecture and the power of the system software. The distributed processor
architecture provides subsystem processors on each circuit pack. A standard
maintenance routine is conducted automatically by the system, as are periodic
backups of translations.
Based on the needs of your organization, two redundancy configurations are
available:
■ Standard reliability
■ High reliability.
Standard reliability
The built-in duplication of many of the system’s parts makes it inherently reliable.
In addition to the dual bus, the system includes the following:
■ One control carrier
■ One tone-clock circuit pack per port network
■ Port networks interconnected by single fiber cables (SCC and MCC
hardware only).
High reliability
NOTE:
The high-reliability option (also known as duplicated systems) may not be
available in your region. Please contact your local account manager or
authorized Lucent Technologies representative for further information about
reliability options.
High-reliability systems include the following:
■ Two control carriers (located in the Processor Port Network cabinet), which
contain duplicate processor and tone-clock circuit packs (one is active and
the other is in standby mode) (G3si and G3r only; not available on G3csi)
■ One tone-clock circuit pack per Expansion Port Network
■ Duplicate connections between the Center-Stage Switch and the
Processor Port Network (G3r only)
■ Expansion port networks connected by single fiber cables
■ Duplicate switch-node clock circuit packs (one is active and the other is in
standby) in each switch-node carrier (G3r only).