Chapter Review Questions

The following questions test your knowledge of topics explained in this chapter. You can find the answers to the questions in Appendix A, "Answers to Chapter Review Questions."

1.	What are the three different types of local-loop signaling? address signaling coding signaling control signaling informational signaling remote signaling supervisory signaling
2.	What is the normal ring cadence in the United States? one 2-second ring followed by 2 seconds of silence one 2-second ring followed by 4 seconds of silence two 0.4-second rings separated by 0.2 seconds of silence, followed by 2 seconds of silence two 2-second rings separated by 4 seconds of silence
3.	Which method is used to reduce echo on Cisco devices? echo suppression echo cancellation echo correction echo return loss
4.	In telephone voice-channel service, how often is the analog-to-digital signal conversion sampling process repeated? 8000 times per call 8000 times per voice sample 8000 times per second 8000 times per minute
5.	Which voice coding technique is used with G.711 CODECs? ADPCM CS-ACELP LDCELP PCM
6.	Which two G.729 CODECs provide built-in IETF VAD and CNG? G.729 G.729A G.729B G.729AB
7.	How many time slots are there in an E1 frame using CAS? 16 24 30 32
8.	How many B channels and D channels are implemented on a PRI T1? 1 B channel and 1 D channel 2 B channels and 1 D channel 23 B channels and 1 D channel 30 B channels and 1 D channel
9.	At what speed does the fax modem operate in a Cisco fax relay environment? 64 kbps 52 kbps 16 kbps 9.6 kbps
10.	Which protocol is used to carry modem signals across a VoIP network when using modem relay? SMTP SPRT MGCP RTP