What is direct speech and reported speech

Reported speech is when we tell someone what another person said. To do this, we can use direct speech or indirect speech. direct speech: 'I work in a bank,' said Daniel. ... In indirect speech, we often use a tense which is 'further back' in the past (e.g. worked) than the tense originally used (e.g. work).

to show how the cables work.

i think the answer your looking for is

enforced