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ATM DS-3 framing PLCP vs. ADM (HEC-direct mapping)

Anyone know of a downside to using HEC/cbitadm (direct ATM cell mapping/HEC cell delineation) vs. PLCP when configuring IGX DS-3 (ATM) trunks and/or IGX lines/ports feeding DS-3 ATM PVCs to co-located 7206 routers using enhanced ATM DS-3 port adapters?

With PLCP giving 96,000 cps vs. HEC giving 104,268 cps, it would seem to always be preferable to go with the latter, unless there are possible ramifications/pitfalls in using HEC/cbitadm DS-3 framing.

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