Page 894 of 910 Appendix D: Product integrity
553-3001-365 Standard 4.00 August 2005

Mean Time Between Failures (MTBF)

The Mean Time Between Failure (MTBF) is 46 years for Voice Gateway
Media Cards. Failures per 106 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 117 on page 894:

Environmental specifications

Table 118 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 117
Voice Gateway Media Card power consumption
Card Type Power Consumption
ITG-Pentium 24-port
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 118
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)