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HDLC protocol and NRM and ABM


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NRM= Normal Response Mode

In this scenario we have one primary station and multiple secondary startions. A primary station can send commands; a secondary station can only respond.

The NRM is used for both point-to-point and multiple-point links.

ABM: Asynchronous Balanced Mode

In this scenarion, the link is point-to-point, and each station can function as a primary and a secondary.

What is it meant by sending command and responding ?

I think it has been meant by point-to-point, for the link, not for point-to-point protocol,,,,,Has not it?

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