Availability

 

Time that a system will be unavailable

 

Availability

A (%)

Unavailable time

per year

Unavailable time
per month

7 nines 99.9999999
0.03
sec
0.003
sec
6 nines 99.999999
0.32
sec
0.026
sec
5 nines 99.99999
3.15
sec
0.259
sec
4 nines 99.9999
31.54
sec
2.592
sec
  99.9995
2.63
min
12.96
sec
3 nines 99.999
5.26
min
25.92
sec
  99.995
26.28
min
2.16
min
2 nines 99.99
52.56
min
4.32
min
  99.95
4.38
hrs
21.60
min
1 nines 99.9
8.76
hrs
43.20
min
  99.8
17.52
hrs
1.44
hrs
  99.7
26.28
hrs
2.16
hrs
  99.6
35.04
hrs
2.88
hrs
  99.5
43.80
hrs
3.60
hrs
  99.4
52.56
hrs
4.32
hrs
  99.3
61.32
hrs
5.04
hrs
  99.2
70.08
hrs
5.76
hrs
  99.1
3.29
days
6.48
hrs
  99.0
3.65
days
7.20
hrs
  98
7.30
days
14.40
hrs
  97
10.95
days
21.60
hrs
  96
14.60
days
28.80
hrs
  95
18.25
days
36.00
hrs
  94
21.90
days
43.20
hrs
  93
25.55
days
50.40
hrs
  92
29.20
days
57.60
hrs
  91
32.85
days
64.80
hrs
  90
36.50
days
72.00
hrs

 

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Assumptions:

 

1 year = 365 days = 8.760 hrs = 525.600 min = 31.536.000 sec

 

1 months = 30 days = 720 hrs = 43.200 min = 2.592.000 sec

 

Availability for Systems

 

The Availability (As) for 2 systems A1 and A2 in series configuration is:

 

As = A1 x A2

 

Example

 

A telecommunications circuit between São Paulo and Rio de Janeiro (Brazil) with:

 

A1= local loop availability in São Paulo

A2= backbone availability between São Paulo and Rio

A3= local loop availability in Rio de Janeiro

 

Acircuit = A1 x A2 x A3

 

 

 

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