7. If the signal-to-noise ratio is 20dB, what is the maximum data rate on a standard voice-grade telephone line? 8. One method of transmitting data is to use portable media transported from one point to another. Consider a box of tapes. The box contains 20 tapes and each tape can hold 800GB of data. The tapes are transported by courier at 65mph. At what distance does the data transfer rate of this method become equivalent to setting up a dedicated OC-12 link (601.344 Mbps) between the two points. 9. List two ways that fiber optic cables differ from coax cables. 10. Does 802.11 use regulated or unregulated frequency bands