Re: NIST

[John Heidemann <johnh@isi.edu>]

On Tue, 07 Sep 1999 20:49:26 PDT, "Nguyen The Luan" wrote: 
>Hi All
>
>I would like to know some things about the NIST-atm-sim program. Please
>help me.
>1. In some application (connection) component file. I can see two seed
>random number  "seed_on" and "seed_off" for two random table "on_state" and
>"off_state". Why do we need two random streams ?. I think only one is
>enough.
>2. what is  the parameter   "cn_flash"  used for  ?
>3.In a real ATM network (in reality), do the applications "vbrbach" and
>"vbrcbatch" exist ? because these apps have constant rate, but  VBR
>application class  has variable bit rate !
>4. I see VBRCBATCH app supports many kinds of pakages. so how can I know
>when a certain kind of package is used?
>5. In VBR class has three kinds of app VBRPOISSON, VBRBATCH and VBRCBATCH. 
>Why VBRBATCH (files  batchconnection.[h,c]) and VBRCBATCH (files 
>cbatchconnection.[h,c]) use  formular M*log(1-X)  to generate the interval
>between cells and VBRPOISSON (files  vbrconnection.[c,h]) doesn't. But I
>think that only VBRPOISSON needs this formular because their arrivals is
>poisson arrival.  VBRBATCH and VBRCBATCH needn't, because their rate is
>constant. 
>[ M  is Mean number of cells generated, X is a random number  0<= X <=1 ]

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   -John Heidemann