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Smart Jack and Vertical Cabling vs Horizontal Cross Connect This lesson discusses different network components. One of these network components is a smart jack. A smart jack is a device located at the demark point and is common in T/E and PRI. Smart jacks transfer from ISP protocol to internally routable protocol. This lesson also covers vertical cabling and horizontal cross connects. Vertical cabling is backbone whereas horizontal cross connects the Intermediate Distribution Frame (IDF) to the hubs, switches and workstations.