Why we need two seperate tables for inbound and outbound in draft-ietf-p

Hi All,
    I  have a query in the draft Managed Objects for ATM over
Packet Switched Network  (draft-ietf-pwe3-pw-atm-mib-05.txt) that why
there are seperate tables for Inbound (pwAtmInboundNto1Table) and
Outbound (pwAtmOutboundNto1Table). Is there any specific reason to
have this, please let me know.


Thanks & Regards,
Murugesan R
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