I think I already know the answer to this, but I have to ask. A product has a mix of printed circuit boards. Some are made by the mfr, some are off the shelf boards. I suppose you could buy them at a place like Fry's (big electronic store out here). Not sure about that.
To declare GR-78 compliance, would the mfr of said product require the mfrs of the boards they buy from vendors be compliant with GR-78 as well? Example - Say your company makes a PC that will go into a CO. The only thing your company actually makes of the product is the box, power supplies, and the motherboard. The product will NOT connect directly to any telephone lines. It will connect to the telephone line through a modem once installed in the CO. It's a plug and play device that accepts any type of PCI interface card you need. You can buy these interface cards almost anywhere. * Are you obligated to require ANY and ALL interface cards to be used in your product to be GR-78 compliant? - Doug