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Overview and Roadmap
1-2 Issue 1 September 1995
Standard Reliability
DEFINITY System G3 standard reliability systems provide the most cost-
effective product. This is the only reliability offering for a G3s system. Standard
reliability systems do not duplicate Tone-Clock(s), the Control Carriers, or any
inter-Port Network (PN) connectivity.
Standard reliability systems use the following components:
■ One control carrier per port network (Expansion Port Network (EPN) or
Processor Port Network (PPN))
■ One Tone-Clock per port network
■ Simplex inter-Port Network (PN) connectivity (via fibre-optic cables)
High Reliability
The G3i high reliability option provides duplication of hardware associated with
the Processor Port Network (PPN) Control Carrier.
High Reliability systems use the following components:
■ Duplicate Control Carriers in the Processor Port Network (PPN)
■ Duplicate Processor Port Network (PPN) Tone-Clocks, one in each
Control Carrier
■ One Tone-Clock per Expansion Port Network (EPN)
■ Simplex inter-Port Network (PN) connectivity
Critical Reliability
G3i critical reliability option provides the highest reliability through duplication of
the control carrier(s), inter-Port Network (PN) connectivity, and Tone-Clocks.
Critical Reliability systems use the following components:
■ Duplicate control carriers in the Processor Port Network (PPN) and
Expansion Port Network (EPN)
■ Duplicate Tone-Clocks in each port network (Processor Port Network
(PPN) and Expansion Port Network (EPN))
■ Duplicate inter-Port Network (PN) connectivity, using duplicated
Expansion Interface circuit packs and fibre optic cables.