Data communication a) What is the relationship between leased line circuits and trunk lines? b) What does a SONET/SDH network do when there is a break in a line between switches? 3. Why is ATM good for voice? 4. What is the worldwide signaling system for telephony? 5. a) Why are microwave repeaters needed?

Data communication

a) What is the relationship between leased line circuits and trunk lines?
b) What does a SONET/SDH network do when there is a break in a line between switches?

3. Why is ATM good for voice?

4. What is the worldwide signaling system for telephony?

5. a) Why are microwave repeaters needed?
b) Does the uplink or the downlink use point-to-point transmission?
c) What is the footprint?
d) Which of the following is good for mobile stations: GEOs, LEOs, or MEOs?
e) What are the rough heights of GEO, LEO, and MEO orbits?
f) What is a VSAT satellite dish?

6. What is the purpose of a PBX?

7. a) Where is plenum cabling required?
b) Why is plenum cabling needed?

8. Create a table to compare and contrast direct distance dialing, toll-free numbers, 900 numbers, and WATS, in terms of whether the caller or the called party pays and the cost compared with the cost of a directly dialed long-distance call.

9. a) What is the advantage of toll-free numbers for customers?
b) What is the advantage for companies that provide toll-free number service to their customers?
10. Name the four advanced telephone services listed in the text.

11. a) Distinguish between the traditional roles of AT&T and the RBOCs.
b) Distinguish between the traditional roles of the FCC and PUCs in the United States.

12. a) Distinguish between LATAs, ILECs, and CLECs.
b) What is the role of IXCs relative to LATAs?
c) What carriers handle long-distance calling in the United States?
d) What is the role of ICCs?
13. Why are POPs important?

14. What issues are involved in the regulation of VoIP?

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