A "Smart jack" is a device that can monitor a connection at the demarc but cannot interpret data.
What is a deamrc point?
A demarcation point, also known as a demarc, is the location where communications infrastructure owned by one organization connects with that of another. In telephone lingo, demarc is the interface between network service provider equipment and client premises equipment.
Demarc points make it easier for clients to understand where their private phone network starts and where the public switched network stops. They also provide you considerably more freedom to choose your phone provider. The border is the line that divides your fibre network from your service provider's fibre network, or "demarc."
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