Avaya Application Solutions Deployment Manual page 236

Reliability and Recovery
S8700/MCC1 and S8700/SCC1 Multi-Connect hardware availability
Table 47: S8700 Multi-Connect hardware availability in three reliability configurations
Multi-Connect hardware that is available in the three reliability configurations.
Table 47: S8700 Multi-Connect hardware availability in three reliability configurations
Standard (duplex) reliability
Sub-system Failure
s/
year
S8700 0.1095
Server
3
complex
SCC1 or 0.153
MCC1
Media
4
Gateways
CSS Intf 0.1095
1. 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
3. For high and critical reliability, the S8700 server complex has duplicated servers, dedicated Ethernet switches, and UPSs.
The duplex reliability configuration consists of duplicated servers and a UPS for each, with a single, dedicated Ethernet
switch.
4. Standard reliability assumes a single IPSI per PN or shared IPSI across multiple PNs. High reliability assumes duplicated
IPSI per carrier in each PN. Critical reliability assumes duplicated IPSI per carrier and duplicated ATM interfaces per
carrier in each PN.
5. Duplicated IPSIs help with two situations. First, a pair eliminates single point of failure for this module itself. More
significantly, a pair allows dual paths through a duplicated data network.
Note:
This availability does not include availability of the customer's data networks,
Note:
PSTN contributions, or contributions due to power outages. A conservative
MTTR of 4 hours is assumed, which includes travel and repair time.
236 Avaya Application Solutions IP Telephony Deployment Guide
MTBO Availability
2
(years)
(%)
9.1 99.995 /
99.998
6.5 99.993 /
99.997
9.1 99.995 /
99.998
Reliability and availability.
High reliability
Failures MTBO Availability
2
/ (years
year ) (%)
<0.0109 >91.3 >99.9995
5
0.0657 15.2 >99.997
99.999
0.0876 11.2 >99.996 /
99.998
Critical reliability
Failures/ MTBO
year (years)
<0.01095 >91.3
5
/ <0.01095 >91.3
<0.01095 >91.3
lists the
1
Availability
2
(%)
>99.9995
>99.9995
>99.9995