By Jeremy Cioara, Michael Valentine
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Extra info for CCNA Voice 640-461 Official Cert Guide. 2nd Edition
Although the voice quality does drop some, the number of binary bits stolen for signaling information is small enough that the change in voice quality is not noticeable. Note Because T1 CAS steals bits from the voice channel to transfer signaling information, it is often called robbed bit signaling (RBS). The voice device running the T1 line uses the eighth bit on every sixth sample in each T1 channel (DS0). Figure 1-8 illustrates this concept. Figure 1-8. CAS T1 Signaling Bits As you can see from Figure 1-8, the 24 channels of the digital T1 circuit carry only voice data for the first five frames that they send.
A. Quantization b. PAM c. PCM d. Codec 6. Which of the following systems allows you to send multiple voice calls over a single digital circuit by dividing the calls into specific time slots? a. MUX b. DE-MUX c. TDM d. TCP 7. When using T1 CAS signaling, which bits are used to transmit signaling information within each voice channel? a. First bit of each frame b. Last bit of each frame c. Second and third bits of every third frame d. Eighth bit of every sixth frame 8. How large is each T1 frame sent over a digital CAS connection?
If you have ever made a call from a home telephone, you have experienced the results of the traditional telephony network. This network is not unlike many of the data networks of today. Its primary purpose is to establish worldwide pathways to allow people to easily connect, converse, and disconnect. Pieces of the PSTN When the phone system was originally created, individual phones were wired together to allow people to communicate. If you wanted to connect with more than one person, you needed multiple phones.