Understanding Ethernet Cable Wiring for 100 Mbps and 1000 Mbps Connections The wiring colors for 1000 Mbps (1000Base-T) and 100 Mbps (100Base-T) Ethernet cables are different, and the number of cores used in each connection also varies. 1000 Mbps (1000Base-T) This standard uses all eight cores of an Ethernet cable. The wiring colors for 1000Base-T are as follows: • Pin 3: White/Green – BI_DB • Pin 4: Blue – BI_DC • Pin 5: White/Blue – BI_DC- • Pin 6: Green – BI_DB- 100 Mbps (100Base-T) This stan