Reliability of wireless networks

I am learning reliability of networks or communication system . I want
to know which parameter or index can be used to evaluate their
reliability,especially in wirless network area.In traditional
reliability area,one of the most usual reliablity parameters is the
probability of no failure occurring in the system , and other
parameters are MTTF(Mean Time To Failure), availability,etc. But I
think the communication networks will be different with traditional
study area. So I want to know some special advice about these. If you
know ,tell me please,and thanks a lot!!

Do your own homework for class.

On 16 Aug 2006 02:32:50 -0700, (E-Mail Removed) wrote in
<(E-Mail Removed) .com>:

>I am learning reliability of networks or communication system . I want
>to know which parameter or index can be used to evaluate their
>reliability,especially in wirless network area.In traditional
>reliability area,one of the most usual reliablity parameters is the
>probability of no failure occurring in the system , and other
>parameters are MTTF(Mean Time To Failure), availability,etc. But I
>think the communication networks will be different with traditional
>study area. So I want to know some special advice about these. If you
>know ,tell me please,and thanks a lot!!

Try Google and Wikipedia.

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>

(E-Mail Removed) hath wroth:

>I am learning reliability of networks or communication system .

From Beijing? This appears to be a homework problem. Please do your
own research. If you're stuck, the university has more resources than
are available in newsgroups and mailing lists.

>I want
>to know which parameter or index can be used to evaluate their
>reliability,especially in wirless network area.

Reliability, S/N ratio (Eb/No), and system fade margin are directly
related.
Reliability Fade Margin
90% 8 dB
99% 18 dB
99.9% 28 dB
99.99% 38 dB
99.999% 48 dB



--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Wow, you guys are rough!

I'm still trying to understand the question this ;-)


<(E-Mail Removed)> wrote in message
news:(E-Mail Removed) oups.com...
>I am learning reliability of networks or communication system . I want
> to know which parameter or index can be used to evaluate their
> reliability,especially in wirless network area.In traditional
> reliability area,one of the most usual reliablity parameters is the
> probability of no failure occurring in the system , and other
> parameters are MTTF(Mean Time To Failure), availability,etc. But I
> think the communication networks will be different with traditional
> study area. So I want to know some special advice about these. If you
> know ,tell me please,and thanks a lot!!
>

On Wed, 16 Aug 2006 19:21:02 -0400, "egross" <(E-Mail Removed)> wrote:

>Wow, you guys are rough!

Yep. There are several Usenet FAQ's on etiquette. For example:
http://www.csam.montclair.edu/Docs/U...uide/news.html
says:
"Please do not use Usenet as a resource for homework assignments."
and so on. You'll find others saying essentially the same thing.

>I'm still trying to understand the question this ;-)

Traditional reliability figures (MTBF, FIT, MTTR, FR, etc) are
measures of failure (or no failure) rates or incidence over a
specified length of time. These can vary of the length of time.
Communications reliability is just a measure of channel availability.

% Availability Downtime per year
95.0 438 hours
99.0 88 hours
99.5 44 hours
99.9 8.8 hours
99.95 4 hours
99.99 53 minutes
99.9995 5.3 minutes
99.9999 32 seconds
99.99999 3.2 seconds

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 (E-Mail Removed)
# http://802.11junk.com (E-Mail Removed)
# http://www.LearnByDestroying.com AE6KS