Internet - Revision history

Michel Lamontagne at 21:09, 6 November 2020

2020-11-06T21:09:45Z

Michel Lamontagne: /* Communication rates */

2020-01-03T18:18:43Z

Communication rates

Michel Lamontagne: /* An established Mars settlement */

2020-01-03T18:18:04Z

An established Mars settlement

Michel Lamontagne at 17:50, 9 August 2019

2019-08-09T17:50:15Z

Michel Lamontagne at 17:48, 9 August 2019

2019-08-09T17:48:03Z

Michel Lamontagne: /* An established Mars base */

2019-05-10T16:50:51Z

An established Mars base

Jburk at 20:34, 17 December 2018

2018-12-17T20:34:04Z

Miros1: Undo revision 7471 by 94.23.1.28 (Talk)

2012-09-30T20:01:50Z

Undo revision 7471 by 94.23.1.28 (Talk)

94.23.1.28: /* Martian Net */

2012-09-30T07:55:25Z

Martian Net

Strangelv: Reverted edits by 120.146.228.167 (Talk) to last revision by Spriditis

2012-06-18T03:55:44Z

Reverted edits by 120.146.228.167 (Talk) to last revision by Spriditis

@@ Line 1: / Line 1: @@
 The first permanent [[settlement]] on [[Mars]] will be of a size that does not necessarily require a distributed computer network. Nevertheless, there is the need for a mutual communication between people on Mars and people on [[Earth]]. The Martian settlement can, therefore, be connected to the terrestrial Internet, which in fact makes it an '''[[Interplanetary Internet]]'''.
-The speed of any communication between Mars and Earth is limited to the [[speed of light]], which results in a minimum delay (when the planets are closest to each other) of about 8 minutes for '''one way'''. This delay increases to approximately 18 minutes when the planets are in [[conjunction]]. This causes another issue as the Sun will be blocking the Line Of Sight (LOS) between the planets, communication signals will need to be re-routed via an [[Deep Space Network|interplanetary network]],<ref>[http://deepspace.jpl.nasa.gov/dsn/ NASA's Deep Space Network]</ref> increasing the time taken for signals to travel between Earth and Mars. Without special buffering the result of a ''mouse click'' appears 16 minutes (minimum), or over 36 minutes (maximum), later on the screen. Time for HTML download will add to this lag. So, at worst, a complete terrestrial web page may take over 40 minutes to display on a Mars-based computer.
+The speed of any communication between Mars and Earth is limited to the [[speed of light]], which results in a minimum delay (when the planets are closest to each other) of about 4-8 minutes for '''one way'''. This delay increases to approximately 18 to 20 minutes when the planets are in [[conjunction]]. This causes another issue as the Sun will be blocking the Line Of Sight (LOS) between the planets, communication signals will need to be re-routed via an [[Deep Space Network|interplanetary network]],<ref>[http://deepspace.jpl.nasa.gov/dsn/ NASA's Deep Space Network]</ref> increasing the time taken for signals to travel between Earth and Mars. Without special buffering the result of a ''mouse click'' appears 16 minutes (minimum), or over 36 minutes (maximum), later on the screen. Time for HTML download will add to this lag. So, at worst, a complete terrestrial web page may take over 40 minutes to display on a Mars-based computer.
 ==Concept for a Martian Internet==

@@ Line 41: / Line 41: @@
 The present communication rates of Martian orbiters is 2 MBps down to Mars and 2 MBps towards Earth.  Mars reconnaissance orbiter does have the capacity to reach 6 MBps, with as little as 35 Watts of power.  Modern telecom Satellites such as Viasat-2 have a power of about 18 kW and could provide many orders of magnitude of supplementary bandwidth.
-Communication rates may be quite high.  For 1000 people, a rate of 20 GBps might be a good number.  A Viasat-2 could analog could possibly provide up to 300 GBps.
+Communication rates may be quite high.  For 1000 people, a rate of 20 GBps might be a good number.  A Viasat-2 analog could possibly provide up to 300 GBps.
 ==References==

@@ Line 25: / Line 25: @@
 Assuming an established Mars settlement will consist of several buildings, or separate settlement sites spaced several kilometers apart, computer communications will be very important. The establishment of a basic "Mars Internet" would therefore be desirable to improve communications around the planet. A Mars Internet (or ''Marsnet'') could be routed via satellites in Mars orbit, use long distance Internet protocols and cell towers or lines may be laid across the Mars surface directly. Using technology developed on Earth, ''Marsnet'' would develop quickly, and depending on the number of colonists, the first Mars websites may be created rapidly.
-However advanced a ''Marsnet'' becomes, communications with the terrestrial Internet will still be limited by the speed of light.  The time lag for Earth to Mars two way communications varies from xx to xx minutes. There is only one solutions to this problem: Cache (store) some of the terrestrial Internet contents on Mars-based servers, with regularly uploading new information or on demand.  The current number of websites on the Internet totals over 100 million (as of Feb. 2007).<ref>[http://www.boutell.com/newfaq/misc/sizeofweb.html How many websites are there? ''Boutell.com'']</ref> By the time a Mars colony is established, this number will have exponentially increased. So, only a subset can be cached. The selected contents may comprise "mission critical" sites such as [[NASA]]'s or [[ESA]]'s web pages, Wikipedia, some online news magazines, scientific and technical sites, artwork, etc.
+However advanced a ''Marsnet'' becomes, communications with the terrestrial Internet will still be limited by the speed of light.  The time lag for Earth to Mars two way communications varies from 8 to 40 minutes. There is only one solutions to this problem: Cache (store) some of the terrestrial Internet contents on Mars-based servers, with regularly uploading new information or on demand.  The current number of websites on the Internet totals over 100 million (as of Feb. 2007).<ref>[http://www.boutell.com/newfaq/misc/sizeofweb.html How many websites are there? ''Boutell.com'']</ref> By the time a Mars colony is established, this number will have exponentially increased. So, only a subset can be cached. The selected contents may comprise "mission critical" sites such as [[NASA]]'s or [[ESA]]'s web pages, Wikipedia, some online news magazines, scientific and technical sites, artwork, etc.
-When Mars is in opostion, the sun creates an obstacle to communications with Earth.  Realy satellites may be required.
+When Mars is in opposition, the sun creates an obstacle to communications with Earth.  Relay satellites may be required.
 ==First use cases==
@@ Line 39: / Line 39: @@
 ==Communication rates==
-The present communication rates of Martina orbiters is...
+The present communication rates of Martian orbiters is 2 MBps down to Mars and 2 MBps towards Earth.  Mars reconnaissance orbiter does have the capacity to reach 6 MBps, with as little as 35 Watts of power.  Modern telecom Satellites such as Viasat-2 have a power of about 18 kW and could provide many orders of magnitude of supplementary bandwidth.
-Communication rates can be quite high.  For 1000 people a rate of 20 GBps might be a good number.
+Communication rates may be quite high.  For 1000 people, a rate of 20 GBps might be a good number.  A Viasat-2 could analog could possibly provide up to 300 GBps.
 ==References==

@@ Line 3: / Line 3: @@
 The speed of any communication between Mars and Earth is limited to the [[speed of light]], which results in a minimum delay (when the planets are closest to each other) of about 8 minutes for '''one way'''. This delay increases to approximately 18 minutes when the planets are in [[conjunction]]. This causes another issue as the Sun will be blocking the Line Of Sight (LOS) between the planets, communication signals will need to be re-routed via an [[Deep Space Network|interplanetary network]],<ref>[http://deepspace.jpl.nasa.gov/dsn/ NASA's Deep Space Network]</ref> increasing the time taken for signals to travel between Earth and Mars. Without special buffering the result of a ''mouse click'' appears 16 minutes (minimum), or over 36 minutes (maximum), later on the screen. Time for HTML download will add to this lag. So, at worst, a complete terrestrial web page may take over 40 minutes to display on a Mars-based computer.
-==Concept==
+==Concept for a Martian Internet==
 The first step can be a single computer and a radio transmitter brought from Earth to Mars. On Earth there is a corresponding radio transmitter, or network of global transmitters, and a buffered interface to Earth's Internet. Internet access may only be available during certain time frames (depending on Earth/Mars phase and availability of communication satellites).

← Older revision		Revision as of 17:48, 9 August 2019
Line 1:		Line 1:
−	The first permanent [[settlement]] on [[Mars]] will be of a size that does not necessarily require a distributed computer network. Nevertheless, there is the need for a mutual communication between people on Mars and people on [[Earth]]. The Martian settlement can, therefore, be connected to the terrestrial Internet, which in fact makes it an '''Interplanetary Internet'''.	+	The first permanent [[settlement]] on [[Mars]] will be of a size that does not necessarily require a distributed computer network. Nevertheless, there is the need for a mutual communication between people on Mars and people on [[Earth]]. The Martian settlement can, therefore, be connected to the terrestrial Internet, which in fact makes it an '''[[Interplanetary Internet]]'''.

	The speed of any communication between Mars and Earth is limited to the [[speed of light]], which results in a minimum delay (when the planets are closest to each other) of about 8 minutes for '''one way'''. This delay increases to approximately 18 minutes when the planets are in [[conjunction]]. This causes another issue as the Sun will be blocking the Line Of Sight (LOS) between the planets, communication signals will need to be re-routed via an [[Deep Space Network\|interplanetary network]],<ref>[http://deepspace.jpl.nasa.gov/dsn/ NASA's Deep Space Network]</ref> increasing the time taken for signals to travel between Earth and Mars. Without special buffering the result of a ''mouse click'' appears 16 minutes (minimum), or over 36 minutes (maximum), later on the screen. Time for HTML download will add to this lag. So, at worst, a complete terrestrial web page may take over 40 minutes to display on a Mars-based computer.		The speed of any communication between Mars and Earth is limited to the [[speed of light]], which results in a minimum delay (when the planets are closest to each other) of about 8 minutes for '''one way'''. This delay increases to approximately 18 minutes when the planets are in [[conjunction]]. This causes another issue as the Sun will be blocking the Line Of Sight (LOS) between the planets, communication signals will need to be re-routed via an [[Deep Space Network\|interplanetary network]],<ref>[http://deepspace.jpl.nasa.gov/dsn/ NASA's Deep Space Network]</ref> increasing the time taken for signals to travel between Earth and Mars. Without special buffering the result of a ''mouse click'' appears 16 minutes (minimum), or over 36 minutes (maximum), later on the screen. Time for HTML download will add to this lag. So, at worst, a complete terrestrial web page may take over 40 minutes to display on a Mars-based computer.

@@ Line 9: / Line 9: @@
 The buffer on Earth side should have some additional functionality:
 * Collect all files (e.g. pictures) that are related to a requested HTML page and send them together with the HTML page. This reduces the time from ''mouse click'' to complete screen display of up to 40 minutes.
-* Reduce resolution of pictures if appropriate.
+*Collect all files (e.g. pictures) that are related to a requested HTML page and send them together with the HTML page. This reduces the time from ''mouse click'' to complete screen display of up to 40 minutes.
-* Compress data stream.
+*Reduce resolution of pictures if appropriate.
-* Add redundancy to the signal to allow data reconstruction for lost bits. The re-transmission of TCP data packets is awfully time consuming in this case and should be avoided.
+*Compress data stream.
-* Another method is to construct a new method of HTML transmission (similar to the cut-down WAP service for cell phones and other mobile devices). Images and graphics may be stripped from websites leaving only HTML text.
+*Add redundancy to the signal to allow data reconstruction for lost bits. The re-transmission of TCP data packets is awfully time consuming in this case and should be avoided.
 ==Solutions to the Internet communications "lag"==
@@ Line 19: / Line 20: @@
 In the first instance (when the first colony is being constructed) it may not be possible to have a functioning "Internet" as we currently understand it. Colonists should, however, have email contact for personal and science-based contact with Earth.
-===An established Mars base===
+===An established Mars settlement===
-In time, the technological capabilities of a Mars base will increase. Also, technological advances on Earth will have accelerated, so an established Mars colony may receive new technologies as it becomes available on Earth.
+In time, the technological capabilities of a Mars settlement will increase. Also, technological advances on Earth will have accelerated, so an established Mars colony may receive new technologies as it becomes available on Earth.
-Assuming an established Mars base will consist of several buildings, or separate settlement sites spaced several kilometers apart, computer communications will be very important. The establishment of a basic "Mars Internet" would therefore be desirable to improve communications around the planet. A Mars Internet (or ''Marsnet'') could be routed via satellites in Mars orbit or lines may be laid across the Mars surface directly. Using technology developed on Earth, ''Marsnet'' would develop quickly, and depending on the number of colonists, the first Mars websites may be created rapidly.
+Assuming an established Mars settlement will consist of several buildings, or separate settlement sites spaced several kilometers apart, computer communications will be very important. The establishment of a basic "Mars Internet" would therefore be desirable to improve communications around the planet. A Mars Internet (or ''Marsnet'') could be routed via satellites in Mars orbit, use long distance Internet protocols and cell towers or lines may be laid across the Mars surface directly. Using technology developed on Earth, ''Marsnet'' would develop quickly, and depending on the number of colonists, the first Mars websites may be created rapidly.
-However advanced a ''Marsnet'' becomes, communications with the terrestrial Internet will still be limited by the speed of light. There is only one solutions to this problem: Cache (store) some of the terrestrial Internet contents on Mars-based servers, with regularly uploading new information or on demand.  The current number of websites on the Internet totals over 100 million (as of Feb. 2007).<ref>[http://www.boutell.com/newfaq/misc/sizeofweb.html How many websites are there? ''Boutell.com'']</ref> By the time a Mars colony is established, this number will have exponentially increased. So, only a subset can be cached. The selected contents may comprise "mission critical" sites such as [[NASA]]'s or [[ESA]]'s web pages, Wikipedia, some online news magazines, scientific and technical sites, artwork, etc.
+However advanced a ''Marsnet'' becomes, communications with the terrestrial Internet will still be limited by the speed of light.  The time lag for Earth to Mars two way communications varies from xx to xx minutes. There is only one solutions to this problem: Cache (store) some of the terrestrial Internet contents on Mars-based servers, with regularly uploading new information or on demand.  The current number of websites on the Internet totals over 100 million (as of Feb. 2007).<ref>[http://www.boutell.com/newfaq/misc/sizeofweb.html How many websites are there? ''Boutell.com'']</ref> By the time a Mars colony is established, this number will have exponentially increased. So, only a subset can be cached. The selected contents may comprise "mission critical" sites such as [[NASA]]'s or [[ESA]]'s web pages, Wikipedia, some online news magazines, scientific and technical sites, artwork, etc.
 ==First use cases==
 *Technology information from Earth to Mars
-*Scientific results from Mars to Earth
+*Technology information from Earth to Mars
-*Personal E-Mails in both directions
+*Scientific results from Mars to Earth
 ==Martian Net==
 Eventually the number of internet servers and web homepages located in Mars will increase, thus solving many of the problems with the use of Earth based homepages.
 ==Open Issues==
 *What minimal transmitter (size, power) is required for a radio link from Earth to Mars (surface to surface)?
-*What data rate can be achieved by simple technology?
+*What minimal transmitter (size, power) is required for a radio link from Earth to Mars (surface to surface)?
-*What time windows exist with a single transmitter on both sides?
+*What data rate can be achieved by simple technology?
 ==References==
-<references/>
+<references />
 [[Category: Communication]]

← Older revision		Revision as of 20:34, 17 December 2018
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	<references/>		<references/>

−	~~[[Category: Concepts]]~~
−	~~[[Category: Hi-tech]]~~
	[[Category: Communication]]		[[Category: Communication]]