Page 754 of 770 Appendix D: Product integrity
553-3001-365 Standard 3.00 September 2004
Mean Time Between Failures (MTBF)
The Mean Time Between Failure (MTBF) is 46 years for Voice Gateway
Media Cards. Failures per 10
6
hours of operation are 2.483, based on
40 degrees C (140 degrees F).
Voice Gateway Media Card power consumption
The worst case current drawn by the Voice Gateway Media Cards from each
Backplane voltage supply is provided in Table 100 on page 754:
Environmental specifications
Table 101 shows the environmental specifications of the Voice Gateway
Media Card. The Voice Gateway Media Card provides external interface
protection to –52 V dc, but does not provide lightning or hazardous voltage
protection.
Table 100
Voice Gateway Media Card power consumption
Card Type Power Consumption
ITG-Pentium 24-port
line card
+
15 volt = 19.3 watts => 0.640 amps
+5 volt = 10.5 watts => 2.1 amps
Media Card + 15 volt = 6 watts => 0.2 amps
+5 volt = 7.25 watts => 1.45amps
Table 101
Voice Gateway Media Card – environmental specifications
Parameter Specifications
Operating temperature 0° to +60° C (+32 to +140° F), ambient
Operating humidity 5 to 95% RH (non-condensing)
Storage temperature –40° to +70° C (–40° to +158° F)
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