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Interface on the
LightStream 2020 ATM switch that allows any traffic based on HDLC or SDLC
frames to traverse the ATM network. Frame forwarding circuits are port-to-port,
and only one PVC is allowed between a pair of ports. Frame forwarding is
supported by the low-speed interface module, which offers V.35, EIA/TIA-449, or
X.21 physical interfaces. Sometimes abbreviated FF.
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