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Whats the difference between passive and normal HDLC?

April 26, 2017difference hdlc normal passive

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Whats the difference between passive and normal HDLC?

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Normal HDLC communications begins by a station issuing a message called SABM. This message is the initiating message that a station uses to set up a connection to another device. The second station receives this message and sends an acknowledges back thus completing the call setup. In certain configurations, a particular station may need to be set up where it cannot initiate a call. It can acknowledge but cannot initiate a call. That is the PASSIVE mode. Another station can set up the call with this station and it will acknowledge the call, but it can never initiate one.