Table of Contents
Advertisement
Avaya DEFINITY Server SI and CSI
Table 52: Avaya DEFINITY Server SI and CSI hardware availability for two reliability
configurations
Sub-
system
SI Processor
Complex
SCC1 or
MCC1 Media
Gateways
1. Running Avaya Communication Manager (September 30, 2002 data).
2. The lower number is the equivalent availability for MTTR of 2 hours, which is attainable with technicians
and spares on site. See also
Maintenance architecture
Software and maintenance architecture recovery
The Communication Manager maintenance architecture is designed to detect and correct errors
as they occur. This greatly reduces events that can cause a system outage. This also enables
quick identification (fault isolation) to a replaceable subassembly. This automatic assessment is
done constantly, in the background of normal operation, so errors can be addressed early and
proactively. Component self-testing, subassembly self-testing, error detection and correction,
and system reconfiguration and alarming escalation paths are all elements of this architecture.
The system software is designed to recover from intermittent failures, and to continue providing
service with a minimum of disruption. Firmware that runs each circuit pack does similar tasks at
the module level, working tightly with the system software.
Figure 72: Maintenance management architecture
maintenance strategies that are built into the communication system.
1
Standard reliability
(single processor carrier)
Failures/
MTBO
year
(years)
0.219
4.6
0.153
6.5
Reliability and
High reliability
(CSI only)
2
Availability
Failures/
(%)
year
99.99 /
<0.01095
99.995
99.993 /
0.0657
99.997
availability.
on page 246 shows the various levels of
Maintenance architecture
MTBO
Availability
(years)
(%)
>91.3
>99.9995
15.2
99.997
Issue 3.4.1 June 2005
2
245
Advertisement
Table of Contents
