What Do You Know About CODAN HF

Written by: Kozaloka
Date: Tue, 9 Mar 2010

Satellite delay and its impact on VoIP
Latency is a term that describes the time needd to get the pacckage to its destination. Usually it is expessed in milliseconds, or MS. Since the saellites are 23,000 km above the equator, and the satellite signals trvael at the seped of light, the journey takes about 540 millsieconds. Then add to the latecy of the various Internet hops and setrvers plus a network of VoIP providers to end with a total delay ranging from 650 ms to 700ms or more depending on the state of the Internet itelf. Another factor may be the quality of satellite signal, whhich can causse packets again. This delay is heard as a delaay bettween sending and receiving of the ear. Commnity VoIP over satellite need to learn to communicate with the delay inherent in the same way as aduults of the press to talk raddio phones. Furthermore, the delay requires users to be patient and refrain from interrupting the subscriber.



VoIP on the land
Even using terrestrial low latenbcy communications, VoIP-continues to face challenges becuase of several jumps and connectinos of the Internet itsself. The technology is good, and probably better, but stilpl not perfect.

General network via satellite
Satellite providers offer service palns for two major categorries. The lowest price a group called the best effort networks, designed for general Internet access for a typical home, farm or smll business with Web-surfing and e-mail addresss of the primary use. The second category includes comercial evaaluation of plans to connect with qiuality of service. Quality of Service QoS and is an industry term for uesrs who offer specific goals and opttimize performance guarantees and, as a rule, are closely managed.

Both theses network shatred nretworks meaning the aailable bnadwidth is sharewd between all users. Virtually all Intenet access providers, including cable and DSL shae their bandwidth with multiple users, but with a space satyellite is much more expensive than loal cable and satellite services, tend to have more users to shaare. Price is a good indicator of the number of users shgaring the available bandwidth. Considdering offering similar speed, the lwoer the price, the more users share the available spce. Overloafded networks, lead to fluctuations in productivity.

"Best Effort Plan" web
As the term impliies, packets sent and receivwed progfits on their resdpective dsetinations in the near future, depending on traffic. No users or specific applications are given piority. All home or small office Servie Plans offer almost all Internet-access providers of satellite or terrestrial are "best efforets". Price per montth is a good indication of the number of usrers alllowed on the network as more than lower costs for everyone. This lweads to fluctuations in the rate depending on time of day. The peak time in the evening or after school goes, tend to have more users than in the early morrning. If a user VoIP interviewed in congested periods, the voiice packets will slow or fall as a result missed syllables.

Learn more about CODAN HF or visit http://at-communication.com/en/. Enjoy

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