A Message can take many paths through the Internet which make the network efficient and its dream desire for those whose Job is to Design communications schemes for the spacecraft leaving Earth each year.After long hard working development NASA will ready by year 2013 to have a communications network that can efficiently carry data between Earth and orbiters, and spacecraft exploring the solar system by efficiently combining them together to form an interplanetary Internet.Tests were taken during last May on the International Space Station were the second of three tryouts of the network’s key technologies, called Delay Tolerant Networking, or DTN, protocols.

The DTN protocols will overcome a number of obstacles by extending the terrestrial Internet into space that will Overcome the extraordinary time delay it takes packets to move between separate hops in a deep-space network, the intermittent nature of network connections, and bit-scrambling solar radiation.

Vint Cerf, co-inventor of the Internet’s TCP/IP protocol and a key member of a group of computer scientists who began working on DTN in 1998 says The communication delays are huge, and theyare variable,because the planets are in orbit around the sun.On Earth, packets move from source to destination in milliseconds. By contrast, a one-way trip from Earth to Mars takes a minimum of 8 minutes. The constant motion of celestial bodies means that packets have to pause and wait for antennas to align as they hop from planet to probe to spacecraft.

An initial test of DTN in space last October was successful. The code was loaded on a comet-studying spacecraft called Deep Impact as that probe headed out for a flyby of Comet Hartley 2.During the test about 300 images were transmitted over distances that stretched up to 24 million kilometers. Although a couple of bugs were found, no packets were dropped, and no bits got corrupted. The software even survived the unintentional reboot of one of the Earth-based antennas.
A key to DTN is a technique called ”store and forward.” Basically Each Bit of Chuck of data is first received at the Buffer then they will be transmitted.

The second test, conducted by Kevin Gifford at the Payload Operations Control Center at the University of Colorado, Boulder, used computers on board the ISS to send images to Earth.

For a third test, scheduled for early October and involving the Deep Impact spacecraft, engineers will introduce a security protocol as well as a new file-transfer protocol. After that, DTN will be pretty much ready for deep-space research