Review Questions

Answers to the review questions can be found in Appendix A, "Answers to Review Questions."

1:	Is Asynchronous Transfer Mode (ATM) a synchronous or asynchronous technique? Explain.
2:	Name three of the advantages of digital signaling over analog signaling?
3:	What does FDM stand for? What rule does FDM obey?
4:	In North America, how many voice channels are in a standard multiplexing scheme for FDM?
5:	Describe the main phases of pulse code modulation (PCM).
6:	What does TDM stand for? What rule does the TDM obey?
7:	What is the purpose of bit number 193 in TDM?
8:	What is a frame in TDM?
9:	What do DS1 and DS-1 stand for? What is the difference between DS1 and DS-1?
10:	What is out-of- band signaling? What is robbed bit signaling?
11:	What do CO, LEC, CLEC, and ILEC stand for? What do they have in common?
12:	What is the role of tandem switches in carrier networks?
13:	What are the main caveats when the enterprise outsources service with the service provider?
14:	What are the three main topologies in Cisco's Ethernet to the First Mile (EFM)?
15:	What does CDMA stand for? Name the 3G minimum speed requirements, as defined by ITU.