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 | | From: | nimmi_srivastav at yahoo.com | | Subject: | Redundancy vs Protection Switching | | Date: | 17 Jan 2005 04:59:12 -0800 |
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 | Hi,
Are redundancy and protection switching synonymous terms, or is there a
difference between the two? I had assumed all along that they are
synonymous. In fact all software implementations of redundancy that I
have seen implement the various protection switching schemes out there.
However, I have also seen terms like "redundancy and protection
switching" in the literature, which makes me think that they may not be
** EXACTLY ** the same.
Thanks
Nimmi
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| | From: | Bill Matern | | Subject: | Re: Redundancy vs Protection Switching | | Date: | Tue, 18 Jan 2005 15:47:06 -0500 |
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| Nimmi,
I think people use the terms interchangeably even through they are
different.
Redundancy means you have additional resources that you can switch over to
when a "primary" resource fails.
A resource could be a card/facility - T1/E1/T3/E3/SONET/SDH/etc./a
system/and so forth.
The Redundant resource takes over when the primary fails.
Protection switching means that you have a criteria that you use to decide
when to switch to a redundant resource.
A good example is Linear Automatic Protection switching as defined by
Telcordia/ITU/etc.
In this example, a protection switch means that you switch your traffic to a
redundant facility - a protection SONET/SDH fiber for example.
You could write an entire book talking about these subjects.
Bill
wtm at ncomm.com
www.ncomm.com
We make & sell software that implements redundancy and protection schemes
for T1/E1/T3/E3/SONET/SDH interfaces.
wrote in message
news:1105966752.550941.137150@f14g2000cwb.googlegroups.com...
> Hi,
>
> Are redundancy and protection switching synonymous terms, or is there a
> difference between the two? I had assumed all along that they are
> synonymous. In fact all software implementations of redundancy that I
> have seen implement the various protection switching schemes out there.
> However, I have also seen terms like "redundancy and protection
> switching" in the literature, which makes me think that they may not be
> ** EXACTLY ** the same.
>
> Thanks
> Nimmi
>
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