ATM vbr-nrt MBS determination

[baerr]

Is there a formula for determining the MBS? This is for a ATM/IMA connection to a frame-relay connected branch.

ATM port is T1, remote brance port is 768k and 256k CIR.

[gmarogi]

This doc talks about the vbr-nrt parameters in detail along with the recommended formula :

http://www.cisco.com/en/US/tech/tk39/tk51/technologies_tech_note09186a0080102a42.shtml

[mehrdad]

Thank you for your useful link.

I have same problem like baerr , i read that cisco document , would you please explain the below paragraph :

Assume a need to transmit interactive traffic that consists of one 1500-byte packet every second for a total of 12 kbps. (We will ignore ATM overhead in this example.) Configure a VBR-nrt using the following specifications:

* PCR = 800 kbps

* SCR = 64 kbps

* MBS = 32 cells

Could you please explain PCR,SCR and MBS in detail?

Kind Regards,

Mehrdad