A 10-Year-old remote telemetry panel and equipment . This image shows a Power supply, PLC, SD Series radio with power input, LEDs, ethernet, serial, RF port and a bulkhead DC block using a bulkhead connector. This image shows a Power Supply (1), PLC (2), SD Series radio with power input (4), LEDs (3), Ethernet (5), serial (6), RF port (7), and bulkhead DC block using a bulkhead connector 8). 