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1-6 Introduction
Mean Time Between Failures (MTBF)
Supported printers
553-4011-110 Standard 1.0 November 1994
before the battery has discharged beyond its operable limit. The AC version
of the NAC does not have this option.
Uninterrupted Power Supply (UPS)
If an Uninterrupted Power Supply (UPS) is being used, in the event of a
power failure, such a system should be backed up manually, then brought
down safely before the battery has discharged beyond its operable limit. If
the system is not backed up before the battery has discharged beyond its
operable limit, your data for that day is lost.
The MTBF value calculated for a NAC application module is 10,500 hours
at 40 C (104 F). Table 1-1 list the major components of the NAC
application module and their MTBF values.
Table 1-1
Mean Time Between Failures (MTBF) for NAC (at 40 C)
Hardware
Motorola MVME167 single board computer
Motorola MVME712M transition board
Motorola MVME332XT intelligent serial interface card
Farnell NF350 (AC) power supply
Farnell ND300 (DC) power supply
Seagate ST11200N 1.2 Gbyte disk drive
TEAC MT–2ST/F50B–000 600 Mbyte cassette drive
(at 15 minutes per-8 hour period)
The following printers or 100% compatible models are supported for
NAC 2.
DEC LA195 (does not support international languages)
HP PaintJet 3630
HP LaserJet series II
HP LaserJet series III
HP LaserJet series 4
MTBF (hours)
83,500
300,000
83,500
72,000
72,000
200,000
34,400
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