Where: Sale life = The period the commercial product is sold by the manufacturer Support life=The period the manufacturer will provide support for the product through spares or call out Extended support= The period by which the support for the product can be extended by other means, for example, by acquiring a sufficient stock of spares or using an alternative repair service.
Sale
Support
Extended
Equipment types
(years)
(years)
support (years)
Mainframe computers
(eg DEC VAX or ALPA)
3
5
5
PC based (eg SCADA)
1
3
3
Distributed control systems (DCS)
10
10
5
Programmable logic controller (PLC)
10
5
2
VMS (IEEE 1014, 32 bit bus systems)
12
5
5
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