CONNECTION SATELLITE BROADBAND

sky broadband

sky broadband

The broadband satellite better known as the satellite connection is a type of broadband connection that is used for areas not covered by the service ADSL . The satellite connection is provided by particular ISPs and is spreading more and more as a valuable tool to ‘ Anti Digital divice due to increasing costs reduced even if higher than the connection ADSL traditional. The speed that are currently being provided by satellite connection are lower than the traditional service access but have the advantage of having an almost full coverage, but has the disadvantage of being unstable. The Satellite Connection uses a system of “networks” different from that achieved with the connections ADSL land and latency times higher, for example, a higher RTT (round trip time).

 

Types of satellite connection

The satellite connection for it to work requires a special modem and satellite dish antenna that must be oriented (Bet) to a geostationary satellite. , we can distinguish two types of satellite connection: Bidirectional and Unidirectional .

ONE-WAY SATELLITE CONNECTION

When we speak of free satellite unidirectional traffic means that the satellite takes place in one direction only, in this case the traffic in Download. All the download traffic is decapsulated and in fact managed by a special satellite modemthat is connected to a satellite dish pointed towards a geostationary satellite. In contrast, the upload traffic is handled by another 56k analog modem must be connected to the traditional telephone network This type of satellite connection , One-way is not nearly as practiced because it has the disadvantage of not allowing an “always-on connection” as the traditional connection ADSL .

TWO-WAY SATELLITE CONNECTION

The satellite connection is a bidirectional connection that takes place in both directions Upload and Download with satellite. It is very similar to the traditional connection ADSL Earth because the entire download and upload traffic is handled directly from the satellite using a satellite dish that is connected to a satellite modem. This type of satellite connection is the most adopted by ISPs because it has the advantage that it can be used even in the absence of telephone line since all traffic download and upload is handled by the satellite modem at the customer’s premises, even if it has as disadvantage costs high that can reach up to 1000 euro per month. directions from the foregoing it is clear that both the satellite connection that one-way and two-way value for money stands to be lower than nettamene ‘ adslEarth.

connessione-satellitare-2

connessione-satellitare-2

 

MAXIMUM SPEED AND COST OF SATELLITE CONNECTION

The speed of the satellite connection depends on different factors such as applications used by the user, minimum guaranteed bandwidth from your ISP, and especially the Internet congestion.

In general, the bandwidth that is offered by different providers ISPs with between 1-4 Mbps with an average around 50 KBytes / s. To evaluate the offers of different ISPs that offer a satellite connection is the Band Maximum and Minimum guaranteed bandwidth, the latter factor certainly of greater importance.

Cost of satellite connection

The cost of the satellite connection can be divided into those related to the subscription and hardware costs that vary according to the type of subscription you choose.

Hardware costs

For the satellite connection we need the following hardware:

  1. Parabola
  2. Sat card
  3. Converters also called satellite feed

The parable has cost around € 100, while oscillating satellite cards, ranging between 200 and 300 € depending on the brand. The converters have a total of around 100 €. Therefore, the initial Hw costs hover around 400-500 euro. These costs as stated above must be added the cost of the subscription.

Costs of Membership

The subscription costs vary from ISP to ISP, the characteristics of the subscription, if you prevvista a guaranteed minimum bandwidth or not and focuses on the services provided. In general, the cost of the subscription varies between 200 and 500 euro per year.

OPERATION SATELLITE CONNECTION

On this page we will explain how the satellite connection . The satellite connection performs the following path:

Satellite connection

The free satellite begins with the request (Step 1) that is made ​​using our connection to the Internet Server, after that retrieve the data from Internet (step 2) and then send them to Satellite (Step 3), and finally the data requested will be sent the requested data from the satellite to our satellite dish (Step 4) of the house that is connected to our Board SAT. An example will be more explanatory, when we We type, for example, the address www.google.it this request ( point 1) is sent to the server SAT provider services through our Internet connection to browse the data (Step 3). When the requested data is found in the Internet Network data is sent to the satellite (Step 3). . Are sent from the satellite dish, and thanks to the board and SATsatellite modem modulated and sent to our PC (go to 4). These data are decoded by the PCI card or Satellite modem and displayed on your PC, and in the end we display the desired page.

satellite connection

satellite connection

They are usually used two types of requests:

  • Http
  • Ftp

These types of requests are preferred because they allow you to make a request of a few bytes, working so efficiently with the Satellite. The limit of satellite connections is constituted by a high response time, this has always been the main problem ofSatellite connections . This is due to the fact that the average distance from Satellite is 36,000 km, then we would have an average access time that is defined by the following formula [36000 km / 300,000 km / s = s = 0.120] 120 ms. 120 ms is the average access time that is multiplied by 2 because, as explained previously before the server must send data to the satellite and then the data should be downloaded or sent by satellite to better our satellite dish. From these considerations, we can then understand how the latency in satellite connections is 4 times higher than the tradzionale ADSL connection which is usually 50 ms.

Now all ISPs offer their customers services such as:

  • Chat
  • Email
  • News

Speaking of satellite connection is necessary to distinguish two technologies:

  • ” One way “
  • ” 2-way “

It parala connection Satellite “one-way” when the satellite connection sends data in one way, or more precisely, let’s talk technology called “one-way”, usually offers email services, the so-called on-demand download (in this case, and as if you were a “reservation” which will then be delivered at a certain time): this type of services such as email services are offline, because it does not require the use of a modem or other Internet connection, but simply a parable that allows you to receive data from the satellite and which are provided on request but automatically at a certain time. This type of connection has the advantage of presenting reduced costs compared to the connection “2-way” and also superior to the classical connectionADSL terrestrial.

The technology, 2-way: it requires the dish and possibly a modem to connect to the Internet. Technology is called ” 2-way“because the connection is on 2 streets, downloads and uploads, in this case there is a communication in both directions.The disadvantage of this technology is the high cost.

TYPES OF SATELLITE CONNECTION

The satellite connection for it to work requires a special modem and satellite dish antenna that must be oriented (Bet) to a geostationary satellite. , we can distinguish two types of satellite connection: Bidirectional and Unidirectional .

ONE-WAY SATELLITE CONNECTION

When we speak of free satellite unidirectional traffic means that the satellite takes place in one direction only, in this case the traffic in Download. All the download traffic is decapsulated and in fact managed by a special satellite modem that is connected to a satellite dish pointed towards a geostationary satellite. In contrast, the upload traffic is handled by another 56k analog modem must be connected to the traditional telephone network This type of satellite connection , One-way is not nearly as practiced because it has the disadvantage of not allowing an “always-on connection” as the traditional connection ADSL .

TWO-WAY SATELLITE CONNECTION

The satellite connection is a bidirectional connection that takes place in both directions Upload and Download with satellite. It is very similar to the traditional connection ADSL Earth because the entire download and upload traffic is handled directly from the satellite using a satellite dish that is connected to a satellite modem. This type of satellite connection is the most adopted by ISPs because it has the advantage that it can be used even in the absence of telephone line since all traffic download and upload is handled by the satellite modem at the customer’s premises, even if it has as disadvantage costs high that can reach up to 1000 euro per month. directions from the foregoing it is clear that both the satellite connection that one-way and two-way value for money stands to be lower than nettamene ‘ adslEarth.

connessione-satellitare-2

connessione-satellitare-2

Satellites used

The satellites are used to connect satellite: Eutelsat (8 degrees SW), ArabSat 3A (26E), Astra (19.2 ° SE), Europestar (45 degrees SE), Hotbird (13.2 ° SE), Astra (26E).