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byte stuffing

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Ken O

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May 23, 2006, 5:12:25 PM5/23/06
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Hi,

I cannot find a good page that has examples on positive and negative byte
stuffing.
anybody knows ?
How would I calculate the max and min rate of a sts-1 with positive and
negative byte stuffing at a rate of 1 out of 4 frames.

thanks

K


Huub van Helvoort

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May 24, 2006, 10:07:13 AM5/24/06
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Hello Ken,

You wrote:

> I cannot find a good page that has examples on positive and negative byte

> stuffing anybody knows ?

Maybe this page will help:
http://www.aarnet.edu.au/engineering/resources/sdh/hp.sync.pdf

> How would I calculate the max and min rate of a sts-1 with positive and
> negative byte stuffing at a rate of 1 out of 4 frames.

one octet per four frames is 8 bits per 500 microseconds = 16 kbit/s.

So the max/min STS-1 rate is 51840 kbit/s +/- 16 kbit/s

Cheers, Huub.

Pieter Hulshoff

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Jun 12, 2006, 10:02:12 AM6/12/06
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Huub van Helvoort wrote:
> So the max/min STS-1 rate is 51840 kbit/s +/- 16 kbit/s

This looks like it's calculated as:
90*9*8*8000 = 51840 kbit/s
For STS-1, since it's payload related adjustment, shouldn't it be:
87*9*8*8000 = 50112 kbit/s +/- 16 kbit/s => 319.3 ppm?

King regards,

Pieter Hulshoff

Miller21Nannie

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Oct 19, 2011, 9:42:28 AM10/19/11
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srishti

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Feb 1, 2014, 5:44:59 AM2/1/14
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so we take 87 or 90??


Huub van Helvoort

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Feb 2, 2014, 1:09:02 PM2/2/14
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Hello Srishti,

You wrote:

> so we take 87 or 90??

You still want to know after 6 years...

Regards, Huub.


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