Migrating X.25 over ACC to X.25 over PSI

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The table below compares X.25/ACC and X.25/PSI, with Protocol layer perspective:
Protocol Layer X.25/ACC X.25/PSI
Layer 1 ACC Hardware WAN (X.25 PSI adapter)
Layer 2 ACC ZCOM I/F Drivers X.25 LAP - B
Layer 3 ACC X.25 PLP (NLI2ZCOM) X.25 Packet Layer Protocol (PLP)
Features of X.25/PSI
X.25/PSI supports the following features:
• Online Addition and Replacement (OLAR) of PSI cards