Satellite internet
Satellite Internet services are used in locations where Terrestrial Internet is not available and in locations which move frequently. Internet access via Satellite is available globally, including vessels at sea. There are three types of Satellite Internet Service: One-Way (Mulitcast), One-Way (Terrestrial return) and two-way.
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2 One-Way (Terrestrial return) 3 Two-Way |
One-Way (Multicast) Satellite Internet systems are used for IP multicast-based data, audio and video distribution. In the US, a FCC license is only required for the uplink station, no license is required for the users.
Usually similiar to One-Way (Terrestrial return), but may include interfaces to the Public Switched Telephone Network for Squawk box applications. An Internet connection is not required, but many applications include an FTP server to queue data for broadcast.
Most One-Way (Multicast) applications require custom programming at the remote sites. The software at the remote site must filter, store, present a selection interface to and display the data. The software at the Teleport must provide access control, priority queueing, sending, and encapsulating of the data.
One-Way (Terrestrial return) Satellite Internet systems are used with traditional Dial-up access to the internet, with outbound data travelling through a telephone modem, but downloads are sent via satellite at a speeds near Broadband Internet access. In the US, a FCC license is only required for the uplink station, no license is required for the users.
Remote sites require a minimum of programming to provide authenication and set Proxy server settings. Filtering is usually provided by the DVB card driver.
Remote sites use the Proxy server at the Teleport, which is configured to route all outbound traffic to the QoS Server, which makes sure no user exceeds their allotted bandwidth or monthly traffic limits. Traffic is then sent to the Encapsulator, which puts the IP packets inside of DVB packets. The DVB packets are then sent to the DVB modem and then to the transmitter (BUC).
Two-Way Satellite Internet sends data from remote sites via satellite to a Hub, which then sends the data to the internet. In the US, each location requires a license from the FCC to operate. The satellite dish at each location must be precisely positioned to avoid interference with other satellites. The oscillators in some radar detectors can cause interference with these systems. Also, each location must use power management to adjust the amount of transmit power to compensate for things like rain fade. There are several types of two way Satellite Internet services TDMA including SCPC.
One-Way (Multicast)
System Hardware Components
System Software Components
One-Way (Terrestrial return)
System Hardware Components
Physical Internet Connection (Fiber optic or copper)
is connected to
CSU/DSU
which uses V.35 to connect to the
Router
which uses Ethernet to connect to the
Firewall
which uses Ethernet to connect to the
Network switch
which uses Ethernet to connect to the
Proxy servers
which uses Ethernet to connect to the
QoS (Quality of Service) Server
which uses Ethernet to connect to the
Encapsulator
which uses Coaxial cable to connect to the
DVB-S modem
which uses Coaxial cable to connect to the
which Upconverter (optional)
which Feedline, a type of Coaxial cable to connect to the
Block Up Converter (BUC)
and
Low Noise Block (LNB)
connects to the
Splitter
which uses a Wave guide (optional) to connect to the
OMT
which is bolted to the
which Feedhorn
which is connected by metal "arms" to the
which Satellite Dish and MountSystem Software Components
Theory of Operation
Two-Way
External links
DirecWay (Formerly DirecPC)