Patch field documentation and revision systems

A communication network device comprising:

• a port module containing a plurality of ports, each port configured to accept a patch cord plug;
• and
• an appliqué attached to a face of the port module between sets of adjacent ports, the appliqué containing a printed circuit board (PCB) that includes, associated with each port in the sets of adjacent ports:
• a conductive pad,
• an LED module, and
• a port identification circuit, the port identification circuit including:
• a port signature resistor having a resistance dependent on the port, and
• a panel signature resistor having a resistance dependent on at least one of the communication network device or a group of ports to which the port belongs, the group of ports containing fewer than all of the ports of the communication network device.

A communication network device comprising:

• a port module;
• a plurality of ports configured to accept a patch cord plug;
• a printed circuit board (PCB) containing a port identification circuit associated with one of the ports, the port identification circuit including:
• a port signature resistor having a resistance dependent on the port and that is measurable when a first voltage is applied to the port identification circuit but not when a second voltage of opposite polarity than the first voltage is applied to the port identification circuit, and
• a panel signature resistor having a resistance dependent on at least one of the communication network device or a group of ports to which the port belongs and that is measurable when the second voltage is applied to the port identification circuit but not when the first voltage is applied to the port identification circuit, the group of ports containing fewer than all of the ports of the communication network device.