AT&T 555-230-894 manual Standard Reliability, High Reliability, Critical Reliability

Overview and Roadmap

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.

1-2Issue 1 September 1995