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Why HDLC won't work in ISDN?

Why can't we use HDLC encapsulation for ISDN? Is PPP the only encapsulation type that is valid for ISDN?

  • WAN Routing and Switching
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Re: Why HDLC won't work in ISDN?

You cannot use HDLC for ISDN lines. The HDLC protocol cannot interface with the ISDN protocol. However PPP does interface with ISDN well. PPP uses LCP (layer 2 protocol) that ISDN and PPP use in order to get the ISDN call and PPP protocol working....

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