User's Manual

Edge Control Node 7000 Series Installation Guide 39
Category Rating
??Infrared Port
??EN 61107 mode C optical communications physical and
electrical interface operating at direct-connect speeds up to
9.6 kbps.
??A ferrous metal ring is integrated into the optical
connection socket for use with a compatible, magnetically-
coupled infrared reading head.
Life Expectancy
Table 12 summarizes the life expectancy specifications for ECN 7620 and 7650
devices.
Table 12. Life Expectancy Specifications
Category Rating
Life Expectancy
The Data Concentrator has been designed for a life
expectancy of at least 10 years, at annual average ambient
temperatures less than or equal to 35 °C and greater than
or equal to -40 °C.
??MTBF
??The predicted mean time between failures (MTBF),
based on MIL-217F Notice 2 with realistic modifications at
25°C, is approximately 2,324,908 hours for DC-1000/SL
Data Concentrators and 1,785,714 hours for DC-1000/SLE
Data Concentrators.
??These MIL calculations are very conservative. DC-
1000/SL and DC-1000/SLE Data Concentrators have been
designed such that the failure rate for 20 years at an
annual average ambient temperature of up to 25°C will
not exceed 0.3% failures per year.