Download Cisco Packetized Voice and Data Integration by Robert Caputo PDF

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  • April 20, 2017
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By Robert Caputo

The entire, step by step advisor to integrating voice and knowledge in Cisco-based networks, with complete assurance of Cisco's packetized voice-enabled items.

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Extra resources for Cisco Packetized Voice and Data Integration

Example text

The standard analog phone has been around for more than 100 years. It is the first piece of telephony most people come into contact with, and is certainly the most ubiquitous telephony device. To successfully interconnect telephony devices, it is necessary to understand the basics of how they operate. This section provides an overview of the basic analog phone operation and connectivity. The subsequent sections present more detail for analog telephony and discuss digital voice concepts. Basic Cabling and Connectors Standard network cabling is a single pair of twisted-pair copper wiring.

729 CS-ACELP 8 24 11 Voice Compression Algorithm *Per channel. 711 PCM Packet Size w/o CRTP, † bytes *Per packet. †Including G-byte data-link header. 2 *Per packet. † Excluding data-link header. 711 PCM 23 Page 19 is consistent with frame relay, PPP, and HDLC header sizes. Low-bit-rate encoders, such as MP-MLQ and CS-ACELP, benefit the most from CRTP because of their smaller payload relative to the IP/UDP/RTP header size. Their gains are significant when considering the transmission of multiple voice calls over low-speed links.

This is significant, as it reduces both bandwidth consumption and the time required for a voice packet to traverse a low-speed network link. The efficiencies gained by CRTP help offset some of the overhead associated with packetized voice traffic. Tables 2-2 through 2-5 demonstrate both packetization overhead and the efficiency gains achieved using CRTP as well as some of the efficiency losses incurred by packetizing voice traffic. 729 CS-ACELP 8 24 11 Voice Compression Algorithm *Per channel. 711 PCM Packet Size w/o CRTP, † bytes *Per packet.

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