Computer Networks - Essay Example

The breakthrough was in being able to transmit voice alls, which are much more sensitive to any time delays or problems on the network, in the same way as data. Packets voice also enables much more efficient use of the network because bandwidth is only used when something is actually being transmitted. Also, the network can handle connection from many applications and many users at the same time, unlike the dedicated circuit-switch approach. The basic process involved in a Poi calls is as follows: Conversion of the callers analogue voice signal into a digital format.

Compression and translation of the digital signal into discrete Internet Protocol packets. Transmission of the packets over Internet or other IP-based network. Reverse translation of packets into an analogue voice signal for the call recipient. The digitization and transmission of the analogue voice as a stream of packets is carried out over a digital data network that can carry data packets using IP and other, related Internet protocols. This network may be an organization’s internal LANA, a leased network, the EST. or the open Internet.

The compression process is carried out by a code, a voice-encoding algorithm, which allows the call to be transmitted over the IP network within the networks available bandwidth. To make a Poi call, the consumer user requires Poi software and a broadband connection to the Internet. The software will handle the call routing to make sure the call reaches the intended destination as well as providing the code. The software can be installed on a variety of hardware devices including traditional telephone handsets ( using an adaptor that plugs into the telephone) or a PC or wireless device such as a Personal Digital Assistant.

This use of software-enhanced end-user devices is one of the key distinguishing features of Poi. Whereas the traditional telephone system contains its intelligence’ within the network, Poi makes use of the Internet model of intelligence at the edge of the network. This is often known as the end-to-end principle. The main advantage of Poi broadband phone service is the cost. Poi broadband phone providers charge you a much lower monthly fee for local, long distance and international calls than traditional phone service.

Poi service is usually bundled with free features (such as caller ID with name, call waiting, conference calls, call forwarding) which are charged for additional cost by traditional phone companies. Even if you already have a regular phone line, Poi is a good low cost alternative to add an additional phone line with extra features and low long distance and international rates. Poi service can be use anywhere with broadband connection. What are the disadvantages of Poi?

Maintaining Reliable Internet Connection for Poi During outages, there will be no internet connection and hence no telephone service, while a cellular phone can be used under such circumstances. Emergency call (911) Poi 911 calls may not connect to the Public Safety Answering Point(ASAP), or may improperly ring to the administrative line of the ASAP, which may not be staffed after hours, or by trained 911 operators. Poi 911 calls may correctly connect to the ASAP, but not automatically transmit the user’s phone number and/or location information.

Poi customers may need to provide location or other information to their Poi providers, and update this information if they change locations, for their Poi 911 service to function properly. Poi service may not work during a power outage, or when the Internet connection fails or becomes overloaded. What specific reliability issues are associated with Poi telephony? Service reliability is a relatively big issue in Poi at this point in the history of the industry. There are three specific instances where the reliability of Poi can become an issue.

Power outages: the problem with Poi is that it relies on a powered modem. In a situation where you may be in a power outage (a scenario where the need for 911 also increases) your Poi may not be available. Living in the country : Those who live in the country will bear witness to the fact that telephone service can be interrupted in sever weather conditions (like a wind storm, for example) and once interrupted, rural lines are the last ones to get serviced. 911: this is one of the biggest concerns with Poi, as noted by the FCC and other government organizations.

No one should ever be without 911 service. What specific security issues are associated with Poi telephony? Data communication over public network is exposed to data security threats. The data can be email, online transaction details, voice data packets etc. The objective of this article is to study the security issues in Poi network. In voice over IP applications, voice data packets are transmitted across insecure public network. Poi is also in a period of constant change, new protocols are being devised and existing ones are being enhanced.

It is difficult to ensure total security on data flow over internet including internet based phone calls. Internet hackers may try to access the data packets transmitted over the internet. The threat on Poi system may occur in different forms. It can be an attack on the network, attack on the application, attack on vendor platforms or a traditional system attacks. The attack may originate from the LANA itself or from the public network. What has been the experience of large business with Poi telephony? Over the last 3 years we have developed a team that specialists in business Poi.

Our Poi telephone systems are based on converged solutions using the latest SIP trunks and Poi technologies for voice, data and video communications over one cable infrastructure. Our business Poi solutions include hosted IP and SIP trunks, suitable for offices of any size, large or small and are designed to cut businesses line rental by up to 50% and significantly reduce business call costs. In addition Synergy one is one of only a hand full of telephony business that can offer the new BAT Business IP voice services. BAT IP is a fully integrated managed telephone service delivered using next generation IP technology.

It solves Poi reliability issue and is a true replacement for KIDS. In your opinion, in he short to medium-term, will Poi replace traditional telephony? Give your reasons why/why not. Poi companies that are changing the way we communicate. It is definitely a great way to Jump right into the communications industry. There are lots of advantages with Poi. If you are familiar with programs like Seep, yahoo voice, are all cheap ways to make phone calls to anywhere in the world. Well I hope lots of companies make a cession for their cell whether they want to switch to or not Poi.