Customer support involves multiple levels of support, where customer support personnel at higher levels have more experience and a higher cost associated with their services. The laminated polyvinyl alcohol sheets provide an increased tear strength to the sheets that allows the device to be fully retrievable through the same catheter used to deploy it. Further, a plurality of semiconductor chips are stacked to manufacture a semiconductor device. To unload the car at the destination, the crawler, with the platform and car on it, is driven out of the carrier vehicle and onto the ground. In order to automatically register communication devices associated with the cable modem, the cable modem inspects the source addresses of outgoing data packets.