atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring Are return losses and propagation delays applicable for telephone cables?

I got the question from my client to do return loss and propagation delay test on telephone cable they are purchasing. But manufacturing vendor saying these tests are not applicable on the telephone cable. But i cannot able to justify why these tests are not applicable on the telephone cables. I searched on the internet found nothing regarding this.

So, My question is why these tests are not applicable for telephone cable? is there any standard stating that?

Thanks.