The Remote 7 accessory for MRCC extends MIDI ports to where you need them in your studio, up to 50' away, and adds 5 additional MIDI outputs!
The Remote 7 is connected to MRCC via an Ethernet cable. The cable is connected to MIDI outputs in the MRCC and those ports are connected to the Remote 7. The RJ45 ports are not Ethernet ports, do not connect Ethernet devices, it may damage the MRCC or your Ethernet device.
When the Remote 7 is connected to MRCC, the MRCC will detect and enable it after a power cycle.
The 3.5MM TRS ports are attached to Remote 7 ports 1 and 2. The 3.5MM port attached to Port 1 is an A type TRS MIDI (the format adopted in the MIDI specification, and used by Korg and others), and the 3.5MM port attached to Port 2 is a B type (as previously used by Arturia and others). Its safe to try both ports to see which works with your MIDI equipment. And both the 5 pin DIN and 3.5MM output attached to it can be used at the same time.
Upon initial release of the MRCC, the Remote 7 ports acted as "MIDI thru" for MRCC outputs 1 thru 5. As of firmware version 1.1.020, the Remote 7 can be configured as five additional individually routable ports configurable on Settings page 2. In the "Remote 1-5" mode, use the Remote button (marked with the Y guy to the left of the MRCC's encoder). While holding that button down, select the output 1 thru 5 to route them. The LED for that outputs turns yellow. Hold the Remote button to see what Remote 7 outputs are routed.