From: Brian McGahan (brian@cyscoexpert.com)
Date: Wed Apr 16 2003 - 22:51:12 GMT-3
Jonathan,
Tc is in milliseconds.
Bc bits = CIR bits | 1 second | Tc milliseconds
------------------------------------------------
1 second | 1000 milliseconds |
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
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> -----Original Message-----
> From: Jonathan V Hays [mailto:jhays@jtan.com]
> Sent: Wednesday, April 16, 2003 8:00 PM
> To: 'Brian McGahan'; ccielab@groupstudy.com
> Cc: 'Mike Williams'
> Subject: RE: MINCIR = CIR?
>
> > -----Original Message-----
> > From: Brian McGahan [mailto:brian@cyscoexpert.com]
> > Sent: Wednesday, April 16, 2003 1:33 PM
> > To: 'Jonathan V Hays'; ccielab@groupstudy.com
> > Cc: 'Mike Williams'
> > Subject: RE: MINCIR = CIR?
> >
> [snip]
> > The following formulas hold true for Cisco's
> > implementation of Frame-Relay Traffic Shaping:
> >
> > Bc = (CIR * Tc)/1000
> > Be = ((AR - CIR) * Tc)/1000
> >
>
> Brian,
>
> What units are you using to require division by 1000? Most Cisco
> documents seem to give Bc= CIR * Tc.
>
>
http://www.cisco.com/en/US/tech/tk713/tk237/technologies_configuration_e
> xample09186a00800942f8.shtml
>
> See the document I cited in my earlier post (included above) under
> "Nonconfigurable parameters - interval (Tc)" -
> ---
> "The time interval during which you send the Bc bits in order to
> maintain the average rate of the CIR in seconds.
>
> Tc = Bc/CIR in seconds.
>
> The range for Tc is between 10 ms and 125 ms."
> ---
> In the example given in the Cisco document, Bc is 8000 bits, CIR is
> 64000 bps, then
> Tc = 8000 bits / 64000 bps = 1/8 second.
>
> Or if you use Bc = CIR * Tc, then
> Bc = 64000 bps * 1/8 second = 8000 bits.
>
> What does dividing by 1000 get me?
>
> Thanks.
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