The preferred location of the loopback jack is at the interface to the Smart Jack. This provides maximum coverage of CPE wiring when remote tests are run using the loopback jack. If the Smart Jack is not accessible, install the loopback jack at the extended demarcation point.
If there is no extended demarcation point, install the loopback jack directly at the network interface point as shown in the figure.
If there is an extended demarcation point and the Smart Jack is not accessible, install the loopback jack as shown in the figure.
If there is an extended demarcation point, but the Smart Jack is accessible, install the loopback jack as shown in the figure.
