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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