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Avaya Modular Messaging Concepts and Planning Guide
13-18 November 2004
Avaya Modular Messaging Concepts and
Planning Guide
Message retention estimate
To calculate the message retention estimate, planners need the following
information:
! Percentage of daily messages retained (A)
Average length of fax
messages
3 pages
Page coverage 80%
Storage format .tif
Fax / day / heavy user 0.75 faxes
% heavy users 10%
Fax / day / user 0.075 faxes
Retention time 2 days
% busy hour 14%
Standard Fine Average
Mix 50% 50% 100%
Storage per page 40.0 KB 80.0 60.0
Port utilization per page 40.0 seconds 70.0 55.0
Storage
Per fax 120.0 KB 240.0 180.0
Per user / day 9.0 KB 18.0 13.5
Per user base / day 4.5 MB 9.0 6.8
Retention 9.0 MB 18.0 13.5
Port utilization
Per fax 120.0 seconds 210 165.0
Per user / day 9.0 seconds 15.8 12.4
Per user base / day 4,500.0 seconds 7,875.0 6,187.5
Per user base / busy hour 630.0 seconds 1,102.5 866.3
Per user base / busy hour 6.3 ccs 11.0 8.7
Per user base / busy hour 0.2 erlangs 0.3 0.2
Table 13-7. Fax port and storage planning