September 2008
Intermediate to advanced
550 pages
18h 10m
English
Content preview from VoIP Voice and Fax Signal Processing
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13.7 NETWORK IMPEDIMENTS CREATION
In a typical VoIP deployment, a VoIP voice call encounters several network impediments. The impediments are classified as delay, jitter, packet reorders, packet drop, duplicate packets, packet errors, and packet fragmentation. Before launching the VoIP voice solution into the real network, the voice solutions have to be tested for various packet impediments and expected network conditions. Several free and proprietary software programs are available that are built to cater to incorporating IP impediments into several thousand calls. An IP wave is one of the network impediment simulators supplied by Spirent [URL (Spirent-IP)]. An IP impediment simulator in a laboratory testing is shown in Fig. 13.1. An IP wave separates the network and introduces impediments as per the set of configurations. The graphical user interface (GUI) on the PC displays several details of the impediments created and monitors progress.
As shown in Chapter 2, VoIP products will be closely associated with several LAN ports such as Ethernet, universal serial bus (USB), and wireless LAN (WLAN). These interfaces are used for both voice and data. In the measurements, voice quality from the VoIP terminals operating on LAN interfaces along with data is also important. Some voice quality aspects with data are given in Chapter 18. To validate these interfaces for voice, VoIP terminals have to be used on LAN interfaces with simultaneous data and IP impediments.
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