Looking for a yellow ethernet cable for your next application? Well, you have come to the right place. Here at RS, we are pleased to offer you a comprehensive range of yellow ethernet cables, available on a reel for installation or as assembled RJ45 patch cables. Yellow ethernet cables are usually used for PoE (Power over Ethernet) connections. PoE is a standard which allows ethernet cable to transmit both data and power at the same time using a single network cable.