Problems in a Satellite Broadband

[Xanty]

Broadband Internet via satellite works just like the television program via satellite. The data received via the satellite dish. Only it did not received to the TV, but rather are passed to the computer. Let me tell you frankly that we have given an assignment where we have to write down the problems faced by such broadband via satellite. Since you people explain in simple language, I thought to post over here instead of wasting time in searching on Google. I am hoping that you will provide some replies sooner.

[joel84]

All satellite connections have one thing in common. The bandwidth is limited and all users of a satellite transponder have to share the bandwidth across country. The bandwidth of a transponder is 34 Mbit / s. Before the data is transferred, they are compressed. It would serve as a bandwidth of about 60 Mbps are available. Suppose that a provider would offer its customers a comparable DSL connection with 1 Mbit / s wish to offer, then the system would be with 60 users who would use this bandwidth at the same time, already saturated. This makes the whole expects the providers are forced to book the system. Up to an indefinite number of Users are doing well. For it not all users are online. But at peak hours in the afternoon and evening, the probability is high that the system to its knees and lowering the data rate for each individual user. So no one finds out how much a system is so overbooked that give out any provider customer base.

[FlayoFish]

The satellites are in geostationary orbit about 36,000 km above the equator. Due to the enormous distance between Earth and satellite transmission systems cause delays and delays in the transmission path. The signals have to be from the ground station back to the satellite and then sent back to Earth. Together this would be 80,000 km. The time for this is ms at about 270. Add to that the time for encoding and decoding the signal, and compressing and decompressing the data stream. Packet delays of 300 ms are the rule. If the data in the uplink and downlink transmitted via the satellite, then this package run time doubled again. In practice, the delivery time will go up greatly when the transmission path is busy. Within some country, packet delays are 500-700 ms usual. More distant targets take even longer. With DSL packet delays are well below 100 ms can be achieved. In comparison, the term is ISDN ms only 40 to 50.

[Guns-n-Roses]

With DSL packet delays are well below 100 ms can be achieved. In comparison, the term is ISDN ms only 40 to 50.

The crucial point here is that the packet delay has a significant influence on the deployable applications. It can, in real-time services such as VoIP or terminal connections (SSH, Telnet) may be delayed. Also, online players are not happy with a satellite connection. For Internet applications, such as web or FTP, or even VPN connections are delays in packet delay is no problem. When you get e-mails and websites, the user remembers little of the delay. And the downloading of large files does the long round trip delay is negligible.

[Saaarc]

Despite modern technology, it is not possible to provide a high bandwidth for global data communication via satellite is available. Satellite-based transmission systems represent rather a more or less useful supplement to reach areas in the no cable and no mobile phone is possible. The Internet offers the first-generation satellites require a return channel from the customer to the Internet via modem or ISDN. It requires a standard dial-up connection in order to realize the return channel. The data connection has two parts. Over the satellite link, the data is received. About the dial-up connection (analog or ISDN), the data is sent to the Internet.

[Jevin]

Although the satellite connection is intended mainly for the downlink, the dial-up connection is used for. As a dialup connection may be bidirectional, ie the transmission in both directions simultaneously, the available connection to the full. For coordination between satellite and dial-up connection, a proxy is the responsibility of both the provider, as is also installed with the user. The proxy on the supply side distributes the data flow on the two routes. The proxy on the user side is the data stream back together. The satellite connection functions like an overflow, which is then used when the data are also faster to users, as the dial-up connection. At this point there is a problem for users that have Internet applications that can not be set for the connection through a proxy. Which can only use the dial-up connection. Then it may happen that the proxy supports all protocols. Also he knows only the commonly used protocols. The hardware for the satellite Internet is standardized. It consists of a satellite dish, a digital-capable LNB and a DVB card or a DVB adapter. A satellite dish diameter of 60 cm is considered adequate. But then it can happen that bad weather with rain or snow dampens the signal from the satellite too. A satellite dish with a larger diameter may evaluate a received signal even worse. Satellite dishes for television reception are usually on Astra (satellite) aligned. If the provider's access through Eutelsat (satellite) offer, then an additional satellite dish or a dual system will be installed with two LNBs. Then, the simultaneous reception of Astra and Eutelsat would be possible.