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  2. Physical, data link, and network
    • According to 2 sources
    The ISDN protocol stack consists of three layers: physical, data link, and network. The data link layer function and format is described in ITU Q.921. Q.921 is also referred to as Link Access Procedure on the D channel (LAPD). This part of the protocol stack is largely based on the high-level data link control (HDLC) protocol.
    ISDN uses circuit-switching to establish a physical permanent point-to-point connection from the source to the destination. ISDN has standards defined by the ITU that encompass the OSI bottom three layers of which are Physical, Data Link and Network, see Table 1 below.
     
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