The yellow optical cable is only required if your setup includes an Internal Termination Point (ITP). You can check your setup by reading our article What does a fibre broadband setup inside the home look like?
The yellow optical cable connects the ITP to the Optical Network Terminal (ONT). If you’re missing your yellow optical cable, please call Enable on 0800 434 273 between 8.00am-5.00pm Monday to Friday.