Справочник Пользователя для Nortel Networks Option 11C
Page 194 of 544
Spares planning
NTAK76 battery back-up unit
The batteries supplied with the NTAK76 have an average useful life of four
years, meaning the batteries are depleted to 80% of capacity, and backup time
is diminished. After this period of time the batteries should be replaced. For
more information refer to theOption 11C and 11C Mini Fault Clearing (553-
3011-500)The mean time between failures (MTBF) of the NTAK76 without
batteries is 370 years at 25
years, meaning the batteries are depleted to 80% of capacity, and backup time
is diminished. After this period of time the batteries should be replaced. For
more information refer to theOption 11C and 11C Mini Fault Clearing (553-
3011-500)The mean time between failures (MTBF) of the NTAK76 without
batteries is 370 years at 25
°
C.
6.37
6.99
17
6.99
7.62
18
7.62
8.26
19
8.26
8.91
20
8.91
9.57
21
9.57
10.20
22
10.2
10.90
23
10.9
11.50
24
11.5
12.20
25
12.2
12.90
26
12.9
13.60
27
13.6
14.30
28
14.3
15.00
29
15.0
15.80
30
Table 59
Number of spares required (Part 2 of 2)
Number of spares required (Part 2 of 2)
NFT values
Number
of spares