[Adfunk Keyword] Satellite internet
6 views
Skip to first unread message
Muhammad
Sep 26, 2005, 7:58:20 AM9/26/05
to Key...@googlegroups.com
Satellite internet services are used in locations where terrestrial Internet access 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 multicast,
* one-way with terrestrial return, and
* two-way satellite access.
One-way multicast
One-way multicast satellite Internet systems are used for IP multicast-based data, audio and video distribution. In the U.S., an FCC license is required only for the uplink station and no license is required for users. Note that most Internet protocols will not work correctly over one-way access, since they require a return channel. However, Internet content such as web pages can still be distributed over a one-way system by "pushing" them out to local storage at end user sites, though full interactivity is not possible. This much like a TV or radio content which offers little user interface.
[edit]
System hardware components
Similar to one-way terrestrial return, satellite Internet 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.
[edit]
System software components
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.
[edit]
One-way with terrestrial return
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 speed near that of broadband Internet access. In the U.S., a FCC license is only required for the uplink station, no license is required for the users.
[edit]
System hardware components
The transmitting station is called the Teleport (also called "Head End", "Uplink Facility", or "Hub"). It has two components:
* Internet Connection: The ISP's routers connect to proxy servers which can enforce QoS (Quality of Service) bandwidth limits and guarantees for user traffic. These are then connected to a DVB Encapsulator which is then connector to a DVB-S modem. The RF signal from the DVB-S modem is connected to an up convertor which is connected via feedline, to the outdoor unit.
* Satellite uplink: 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 feedhorn which is connected by metal "arms" to the satellite dish and mount.
At the remote locations (Earth Stations) the setup consists of:
* Outdoor Unit
o Satellite dish w/mount
o Feedhorn (only if Direct broadcast satellite)
o Universal Low Noise Block (LNB), this is, Ku band.
o Feedline
* Indoor Unit
o DVB-S PCI Card (in a computer) or DVB external modem (via USB or similar port).
Each remote location is also equipped with a modem; the connections for this are as with a conventional dial-up ISP. Two way satellite systems may sometimes use the modem channel in both directions for data where latency is more important than bandwidth, reserving the satellite channel for download data where bandwidth is more important than latency, such as for file transfers.
[edit]
System software components
Remote sites require a minimum of programming to provide authenication and set Proxy server settings. Filtering is usually provided by the DVB card driver.
Often, non-standard IP stacks are used to address the latency and asymmetry problems of the satellite connection. Data sent over the satellite link is generally also encrypted, as otherwise it would be accessible to anyone with a satellite receiver.
Upload speeds are limited by one's dialup modem, and latency is high, as it is for any satellite based Internet. Download speeds can be very fast compared to dialup, but are generally slower than terrestrial broadband methods.
[edit]
Theory of operation
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).
[edit]
Two-way
Two-way satellite Internet sends data from remote sites via satellite to a hub, which then sends the data to the Internet. 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, such as TDMA or SCPC.
Uplink speeds rarely exceed one megabit per second and latency can be up to one second. Satellite phone services such as Iridium also provide data services at the comparatively slow speed of 2400 bit/s.
See the standard DVB-RCS.
* satellite internet connection * satellite internet * satellite internet services * satellite internet access * mobile satellite internet * internet via satellite * satellite internet provider * direct tv satellite internet * direct way satellite internet * satellite internet service * internet satellite * two way satellite internet * one way satellite internet * satellite internet providers * satellite high speed internet * speed satellite internet * high speed satellite internet * way satellite internet * direcway satellite internet * speed internet satellite * rv satellite internet * satellite internet for * high speed internet satellite * satellite tv internet * broadband satellite internet * network satellite internet * satellite tv and internet * satellite internet in * dish network satellite internet * satellite broadband internet * directway satellite internet * satellite internet and * blue satellite internet * tv satellite internet * satellite internet dish * satellite internet service provider * satellite internet rv * cheap satellite internet * satellite wireless internet * mobile satellite internet access * wildblue satellite internet * portable satellite internet * internet by satellite * satellite internet service providers * internet access satellite * satellite internet tv * direct satellite internet * internet satellite service * wireless satellite internet * wild blue satellite internet * satellite internet connections * 2 way satellite internet * dish satellite internet * satellite internet mobile * satellite internet review * directv satellite internet * satellite dish internet * starband satellite internet * satellite internet and tv * satellite internet middle east * satellite internet iraq * band satellite internet * of satellite internet * laptop satellite internet * internet satellite dish * satellite internet speed * mobile internet satellite * satellite internet systems * satellite internet reviews * with satellite internet * satellite and internet * vsat satellite internet * and satellite internet * broadband internet satellite * for satellite internet * satellite internet dish network * satellite internet blue * satellite internet broadband * earthlink satellite internet * best satellite internet * satellite based internet * internet satellite tv * is satellite internet * satellite internet service in * internet access via satellite * internet and satellite * residential satellite internet * satellite internet vs * satellite internet laptop * satellite internet system * satellite internet canada * internet over satellite * internet satellite providers * speed internet via satellite * high speed internet via satellite * way internet satellite * international satellite internet * on satellite internet * wireless internet satellite * satellite internet equipment * satellite internet access in * satellite internet europe * internet par satellite * satellite internet on * internet satellite connection * satellite internet prices * satellite internet africa * worldwide satellite internet * internet satellite access * internet through satellite * satellite internet middle * internet connection satellite * satellite internet south * orbit satellite internet * satellite internet ontario * way internet via satellite * internet via satellite in * internet satellite provider * canada satellite internet * canadian satellite internet * satellite internet australia * satellite via internet * internet satellite canada * satellite internet saudi * internet satellite europe * connexion internet par satellite * satellite internet uk * satelite broadband * starband internet * sat internet * vsat internet ©
--
Posted by Muhammad to Adfunk Keyword at 9/26/2005 04:57:00 AM
* one-way multicast,
* one-way with terrestrial return, and
* two-way satellite access.
One-way multicast
One-way multicast satellite Internet systems are used for IP multicast-based data, audio and video distribution. In the U.S., an FCC license is required only for the uplink station and no license is required for users. Note that most Internet protocols will not work correctly over one-way access, since they require a return channel. However, Internet content such as web pages can still be distributed over a one-way system by "pushing" them out to local storage at end user sites, though full interactivity is not possible. This much like a TV or radio content which offers little user interface.
[edit]
System hardware components
Similar to one-way terrestrial return, satellite Internet 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.
[edit]
System software components
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.
[edit]
One-way with terrestrial return
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 speed near that of broadband Internet access. In the U.S., a FCC license is only required for the uplink station, no license is required for the users.
[edit]
System hardware components
The transmitting station is called the Teleport (also called "Head End", "Uplink Facility", or "Hub"). It has two components:
* Internet Connection: The ISP's routers connect to proxy servers which can enforce QoS (Quality of Service) bandwidth limits and guarantees for user traffic. These are then connected to a DVB Encapsulator which is then connector to a DVB-S modem. The RF signal from the DVB-S modem is connected to an up convertor which is connected via feedline, to the outdoor unit.
* Satellite uplink: 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 feedhorn which is connected by metal "arms" to the satellite dish and mount.
At the remote locations (Earth Stations) the setup consists of:
* Outdoor Unit
o Satellite dish w/mount
o Feedhorn (only if Direct broadcast satellite)
o Universal Low Noise Block (LNB), this is, Ku band.
o Feedline
* Indoor Unit
o DVB-S PCI Card (in a computer) or DVB external modem (via USB or similar port).
Each remote location is also equipped with a modem; the connections for this are as with a conventional dial-up ISP. Two way satellite systems may sometimes use the modem channel in both directions for data where latency is more important than bandwidth, reserving the satellite channel for download data where bandwidth is more important than latency, such as for file transfers.
[edit]
System software components
Remote sites require a minimum of programming to provide authenication and set Proxy server settings. Filtering is usually provided by the DVB card driver.
Often, non-standard IP stacks are used to address the latency and asymmetry problems of the satellite connection. Data sent over the satellite link is generally also encrypted, as otherwise it would be accessible to anyone with a satellite receiver.
Upload speeds are limited by one's dialup modem, and latency is high, as it is for any satellite based Internet. Download speeds can be very fast compared to dialup, but are generally slower than terrestrial broadband methods.
[edit]
Theory of operation
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).
[edit]
Two-way
Two-way satellite Internet sends data from remote sites via satellite to a hub, which then sends the data to the Internet. 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, such as TDMA or SCPC.
Uplink speeds rarely exceed one megabit per second and latency can be up to one second. Satellite phone services such as Iridium also provide data services at the comparatively slow speed of 2400 bit/s.
See the standard DVB-RCS.
* satellite internet connection * satellite internet * satellite internet services * satellite internet access * mobile satellite internet * internet via satellite * satellite internet provider * direct tv satellite internet * direct way satellite internet * satellite internet service * internet satellite * two way satellite internet * one way satellite internet * satellite internet providers * satellite high speed internet * speed satellite internet * high speed satellite internet * way satellite internet * direcway satellite internet * speed internet satellite * rv satellite internet * satellite internet for * high speed internet satellite * satellite tv internet * broadband satellite internet * network satellite internet * satellite tv and internet * satellite internet in * dish network satellite internet * satellite broadband internet * directway satellite internet * satellite internet and * blue satellite internet * tv satellite internet * satellite internet dish * satellite internet service provider * satellite internet rv * cheap satellite internet * satellite wireless internet * mobile satellite internet access * wildblue satellite internet * portable satellite internet * internet by satellite * satellite internet service providers * internet access satellite * satellite internet tv * direct satellite internet * internet satellite service * wireless satellite internet * wild blue satellite internet * satellite internet connections * 2 way satellite internet * dish satellite internet * satellite internet mobile * satellite internet review * directv satellite internet * satellite dish internet * starband satellite internet * satellite internet and tv * satellite internet middle east * satellite internet iraq * band satellite internet * of satellite internet * laptop satellite internet * internet satellite dish * satellite internet speed * mobile internet satellite * satellite internet systems * satellite internet reviews * with satellite internet * satellite and internet * vsat satellite internet * and satellite internet * broadband internet satellite * for satellite internet * satellite internet dish network * satellite internet blue * satellite internet broadband * earthlink satellite internet * best satellite internet * satellite based internet * internet satellite tv * is satellite internet * satellite internet service in * internet access via satellite * internet and satellite * residential satellite internet * satellite internet vs * satellite internet laptop * satellite internet system * satellite internet canada * internet over satellite * internet satellite providers * speed internet via satellite * high speed internet via satellite * way internet satellite * international satellite internet * on satellite internet * wireless internet satellite * satellite internet equipment * satellite internet access in * satellite internet europe * internet par satellite * satellite internet on * internet satellite connection * satellite internet prices * satellite internet africa * worldwide satellite internet * internet satellite access * internet through satellite * satellite internet middle * internet connection satellite * satellite internet south * orbit satellite internet * satellite internet ontario * way internet via satellite * internet via satellite in * internet satellite provider * canada satellite internet * canadian satellite internet * satellite internet australia * satellite via internet * internet satellite canada * satellite internet saudi * internet satellite europe * connexion internet par satellite * satellite internet uk * satelite broadband * starband internet * sat internet * vsat internet ©
--
Posted by Muhammad to Adfunk Keyword at 9/26/2005 04:57:00 AM
Reply all
Reply to author
Forward
0 new messages