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Extra info for CCNA Voice Official Exam Certification Guide
Example text
The Cisco VoIP Structure The OSI reference model was designed to create standard methods of connecting and communicating across data networks. In the realm of voice, similar connection models exist to describe voice communications. 1. qxd 36 10/9/08 8:34 AM Page 36 CCNA Voice Official Exam Certification Guide Each of these layers represents an integral piece of the voice network. While the layers work together to create a functional voice network, each layer performs unique functions to the voice network.
3. 4. 5. Analog phones connected to the PSTN typically use which of the following signal types? a. Loop start b. Ground start c. CAS d. CCS Which of the following issues is prevented by using ground start signaling? a. Echo b. Glare c. Reflexive transmissions d. Mirrored communication Which of the following signaling types represents supervisory signaling? a. Off-hook signal b. Dial tone c. DTMF d. Congestion What are two disadvantages of using analog connectivity? a. Conversion complexity b. Signal quality c.
Thus, until then, the new VoIP networks must integrate with traditional telephony networks. In order to perform this integration, you must have a basic understanding of the world of traditional voice telephony. This chapter walks you through the foundations of the public switched telephone network (PSTN), private branch exchange (PBX) systems, and analog and digital circuitry. ” quiz allows you to assess whether you should read this entire chapter or simply jump to the “Exam Preparation Tasks” section for review.