[c-nsp] Questions about POS packing inside STM payload

[Tony Li]

>   I have a question about packing IP packets inside STM-1 
> transmision lines
> using POS:
> 
>   The POS standard says (roughly) to take the IP packet, 
> encapsulate it into
> PPP and then put this into the VC4 payload. The VC4 payload 
> is 2,340 bytes, so
> what is done when there are  small packets to send? Are they simply
> concatanated one after the other in one payload?
>   if there is nothing to send (or not enough packets to fill 
> the payload) how
> is it padded? with HDLC flags?


Yes, it's good old HDLC byte-stream encoding and spans the SONET frame.

Tony