The IP over ATM Mailing List Archive by date

[hiroshi@ctr.columbia.edu (Hiroshi Esaki)]

On Thu, 28 Mar 96 11:40:33 -0500 Peter Schulter wrote: 
 pete> Also, I don't think you would need a layer 3 device at every merge point.

Agree. We can use either a layer 3 device or a frame awaring flow 
mergiable cell switch engine. 

 pete> All you really need is something above the SAR layer that relays AAL5 
 pete> SDUs.
 pete> This would not have to have any layer 3 awareness.  
 pete> All that needs to be done is to re-assemble AAL5 SDUs and 
 pete> relay them out on the appropriate hop to the next switch (or next VC). 
More precisely, we do not need "re-assemble" AAL5 SDUs, but just 
schedule cells so as to avoid unhappy cell interleaving. 
  
 pete> This is basically what an MCS is.  
I guess it depends on the implementation. 
Whether really re-assemble AAL5 SDU (i.e., CRC-32 check) and assemble 
again in MCS or not (just scheduling the cell departure) seems to be 
implementation issue for each MSC vendor.  


Hiroshi Esaki (Toshiba)  
c/o CTR, Columbia Univ.