Failure rates 23
Table 4 continued
-
Failure rates of circuit packs
1
PEC/NT
1
Description
1 Failure
Rate1
Code
QPC494
QPC496
QPC500
500/2500 Message Waiting
Extender
PE Backplane
per
lo6
hrs
8.00
0.69
3.24
1
QFC527
QPC528
QPC532
QPC536
OF040
1
CO/FX/WATS trunk (A-law)
1
12.37
1
CO/IX/WATS trunk
-
(EIA) 14.23
Grd Button Line Card 13.93
Digital Trunk Interface
12.36
.-
Tone Detector
6.49
I
-continued-
1
-.
..:,:.:
,:,
,’ .-,
,
Spares planning 553-3001-l 53
c.
: