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Reliability and Recovery
them. If necessary the circuits are taken out of service, and an alarm is automatically sent,
prompting the dispatch of a technician. Where necessary, the design incorporates redundancy
at the device or subassembly level to add reliability where it is most needed. As an example of
the level at which the maintenance architecture is thoroughly built in, consider that at least 30%
of the software code for Avaya Communication Manager is dedicated to the maintenance
subsystem. The firmware that runs the circuit packs, which also interacts with the maintenance
software, is similarly designed.
Hardware considerations
Table 45: Comparison of circuit packs and subassemblies failure rates
Avaya circuit packs and subassemblies are extraordinarily reliable relative to the industry in
general. This is not by accident. The heritage of "five 9s" (99.999%) availability results from
design, manufacture, and lifetime support based on an uncompromising focus on system
availability, and refined by tens of billions of hours of user experience.
This is due to highly effective knowledge and execution of "Design for Manufacture, Installation,
Reliability, and Serviceability:"
Quality control that is executed thoroughly from electrical device vendor partnerships,
through every stage of the assembly process. The highest quality is pushed to the earliest
step of the process possible (based on Deming's "zero defects and zero errors;" this
actually reduces overall costs substantially)
Commonality that is leveraged at all levels
- Piece-parts. Many of the "workhorses" of the product are in their fifth to seventh
generation of silicon integration. This keeps us on the leading edge of technology curves.
- Subassemblies. Help customers in many ways, not the least of which is investment
protection. The subassemblies are also in their fifth to seventh level of renewal and
refinement.
- Shared designs. Even in cases where subassemblies cannot be directly reused,
common designs that have been "bullet-proofed" over years are reapplied in new
configurations as appropriate.
- Communication Manager. Avaya's robust, feature-rich, "battle-hardened" software for
high-reliability enterprise systems, is common across Avaya IP solutions and traditional
solutions.
1 In his Leading the Revolution Gary Hamel speaks of the importance of "getting different" rather than "getting
better." The "zero defects and zero errors" passion fostered by the Quality giant, Dr. Deming, in the 1980s was
revolutionary. The prevailing conventional wisdom was that quality just needed to be "good enough" (whatever
that is), and that to increase quality beyond "good enough" would be cost prohibitive...and provide diminishing
returns. The convention wisdom missed the concept that if "causes" of quality problems are addressed, overall
costs actually go down.
232 Avaya Application Solutions IP Telephony Deployment Guide
1
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on page 233 shows that
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