By Syngress, Martin Walshaw, Sean Thurston, Jeff Bankston
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Additional resources for Cisco AVVID and IP Telephony Design and Implementation
Or they may be ground start, where an earth ground is needed to complete the loop and allow connectivity. NOTE It is important to remember that voice services are based on time division multiplexing, or TDM. This is the basis for most connections in the voice world, just as it is for T-1 signaling. A DS-0 is a single voice digital channel of traditional voice bandwidth—8Hz at 8 bits per sample. com 13 109_AVVID_DI_01 14 10/9/01 2:15 PM Page 14 Chapter 1 • Old World Technologies PBXs via T-1s. The central office would also provide a Direct Inward Dial (DID), although such connections are typically bi-directional today.
Providing Video Services ; Video services can demand the most real-time bandwidth in the network. ; Video data is typically compressed to reduce its load on the network. ; One-to-many video is a perfect application for IP multicast. Frequently Asked Questions The following Frequently Asked Questions, answered by the authors of this book, are designed to both measure your understanding of the concepts presented in this chapter and to assist you with real-life implementation of these concepts. com/solutions and click on the “Ask the Author” form.
These tones represent the numeric values of the buttons, in addition to the asterisk (*) and pound (#) keys. This addressing is signaled using the DTMF tones. You’re probably thinking this doesn’t make sense, but it does. com 109_AVVID_DI_01 10/9/01 2:15 PM Page 9 Old World Technologies • Chapter 1 happen if that path failed? This decision adds a dynamic to the typically static limitations of the PBX forwarding system. NOTE Most PBX phones are digitally connected to the PBX and do not send the actual DTMF tones from the phone to the switch.
Cisco AVVID and IP Telephony Design and Implementation by Syngress, Martin Walshaw, Sean Thurston, Jeff Bankston
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