Information Technology Reference
In-Depth Information
Review All the Key Topics
Review the most important topics in the chapter, noted with the key topics icon in the
outer margin of the page. Table 1-4 lists and describes these key topics and identifies the
page numbers on which each is found.
Table 1-4
Key Topics for Chapter 1
Key Topic
Element
Description
Page
Number
Figure 1-3
Illustrates the wired connections to an analog phone
7
List
Two methods used to deliver signaling with digital circuits
11
Figure 1-7
Illustrates TDM
12
Tip
Specific signaling time slot for T1 and E1 circuits using
CCS
12
List
Components of the PSTN
13
Table 1-2
Common audio codecs, bandwidth consumption, and
MOS rating
21
Note
PVDM ratings
21
Text
RTP concepts and port ranges
24
Definitions of Key Terms
Define the following key terms from this chapter, and check your answers in the Glossary:
analog signal, loop start signaling, ground start signaling, glare, time-division multiplexing
(TDM), channel associated signaling (CAS), common channel signaling (CCS), robbed bit
signaling (RBS), Q.931, local loop, private branch exchange (PBX), key system, Signaling
System 7 (SS7), E.164, quantization, Nyquist theorem, mean opinion score (MOS), G.711,
G.726, G.728, G.729, Real-time Transport Protocol (RTP), Real-time Transport Control
Protocol (RTCP)
