By Amir Ranjbar
* grasp all 642-845 examination themes with the respectable research consultant * check your wisdom with chapter-opening quizzes * assessment key ideas with starting place summaries * perform with 1000s of examination questions about the CD-ROM CCNP ONT legitimate examination Certification consultant is a better of breed CiscoR examination learn advisor that focuses in particular at the targets for the Optimizing Converged Cisco Networks examination (642-845 ONT). effectively passing the ONT 642-845 examination certifies that you've the information and abilities essential to optimize and practice powerful QoS recommendations for converged networks.CCNP ONT reliable examination Certification advisor follows a logical association of the CCNPR ONT examination ambitions. fabric is gifted in a concise demeanour, targeting expanding your retention and bear in mind of examination subject matters. you could arrange your examination coaching by using the constant gains in those chapters. "Do i do know This Already?" quizzes open each one bankruptcy and let you make a decision how a lot time you want to spend on every one part. examination subject lists and concise starting place precis info make referencing effortless and provides you a short refresher everytime you want it. hard chapter-ending assessment questions assist you check your wisdom and strengthen key concepts.The better half CD-ROM features a robust trying out engine that allowsyou to target person subject components or take whole, timed checks. The evaluation engine additionally tracks your functionality and gives suggestions on a topic-by-topic foundation, offering question-by-question remediation to the textual content. good appeared for its point of aspect, evaluation positive aspects, and hard assessment questions and routines, this booklet is helping you grasp the techniques and methods which could aid you be triumphant at the examination the 1st time.
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For example, one type of DSP can handle tasks such as codec and transcoding for up to 16 voice channels if a low-complexity codec is used, or up to 8 voice channels if a high-complexity codec is used. book Page 26 Monday, April 23, 2007 8:58 AM 26 Chapter 1: Cisco VoIP Implementations Figure 1-8 Network Module with PVDMs PVDM2 Slots (Two on Each Side, Total of Four) Onboard T1/E1– Ports DSPs provide three major services: ■ Voice termination ■ Transcoding ■ Conferencing Calls to or from voice interfaces of a voice gateway are terminated by DSPs.
CRTP must be applied on both sides of a link, and essentially the sender and receiver agree to a hash (number) that is associated with the 40 bytes of IP, UDP, and TCP headers. Note that cRTP is applied on a link-by-link basis. The premise of cRTP is that most of the fields in the IP, UDP, and RTP headers do not change among the elements (packets) of a common packet flow. After the initial packet with all the headers is submitted, the following packets that are part of the same packet flow do not carry the 40 bytes of headers.
If the checksum is used, the 40 bytes overhead is reduced to 4 bytes. If, during transmission of packets, a cRTP sender notices that a packet header has changed from the normal pattern, the entire header instead of the hash is submitted. Figure 1-13 displays two packets. 711 codec, and a 2-byte cRTP header (without checksum). 25 percent. 8 Kbps (without header checksum). 729 codec and a 2-byte cRTP header (without checksum). The cRTP overhead-to-voice payload ratio in this case is 2/20, or 10 percent.