paragraph_text: Optus can trace its beginnings back to the formation of the Government-owned AUSSAT Pty Limited in 1981. In 1982, Aussat selected the Hughes 376 for their initial satellites, with the first, AUSSAT A1, launched in August 1985. AUSSAT satellites were used for both military and civilian satellite communications, and delivering television services to remote outback communities.

paragraph_text: NOAA-4, also known as ITOS-G was a weather satellite operated by the National Oceanic and Atmospheric Administration (NOAA). It was part of a series of satellites called ITOS, or improved TIROS. NOAA-4 was launched on a Delta rocket on November 15, 1974. The launch carried two other satellites: AMSAT-OSCAR 7 and Intasat. It remained operational for 1463 days until it was deactivated by NOAA on November 18, 1978.

paragraph_text: ATS - 6 (Applications Technology Satellite - 6) was a NASA experimental satellite, built by Fairchild Space and Electronics Division It has been called the world's first educational satellite as well as world's first experimental Direct Broadcast Satellite as part of the Satellite Instructional Television Experiment between NASA and Indian Space Research Organisation (ISRO). It was launched May 30, 1974, and decommissioned July 1979. At the time of launch, it was the most powerful telecommunication satellite in orbit. ATS - 6 carried no fewer than 23 different experiments, and introduced several breakthroughs. It was the first 3 - axis stabilized spacecraft in geostationary orbit. It was also the first to use experimentally with some success electric propulsion in geostationary orbit. It also carried several particle physics experiments, including the first heavy ion detector in geostationary orbit.

paragraph_text: The first and historically most important application for communication satellites was in intercontinental long distance telephony. The fixed Public Switched Telephone Network relays telephone calls from land line telephones to an earth station, where they are then transmitted to a geostationary satellite.  The downlink follows an analogous path.  Improvements in submarine communications cables through the use of fiber-optics caused some decline in the use of satellites for fixed telephony in the late 20th century.

paragraph_text: TDRS-6, known before launch as TDRS-F, is an American communications satellite which is operated by NASA as part of the Tracking and Data Relay Satellite System. It was constructed by TRW, and is based on a custom satellite bus which was used for all seven first generation TDRS satellites.

paragraph_text: INSAT-4CR is a communications satellite operated by ISRO as part of the Indian National Satellite System. Launched in September 2007, it replaced the INSAT-4C satellite which had been lost in a launch failure the previous year. The satellite is stationed in geostationary orbit at a longitude of 74 degrees east, and is expected to operate for ten years, however this may have been reduced by the underperformance of the Geosynchronous Satellite Launch Vehicle which placed it into orbit. INSAT-4CR is planned to be replaced by GSAT-31, which was launched on February 6, 2019.

paragraph_text: The A2100 is a communications satellite spacecraft model made by Lockheed Martin Space Systems in the 1990s-2010s for telecommunications in geosynchronous orbit, as well as GOES-R weather satellites and GPS Block IIIA satellites.

paragraph_text: As of 2009, Internet via satellite had a steady growth rate of 10% to 15% per year. It was particularly in demand in remote areas that did not have either dialup or wireless online services. The local telecommunications company Dalkom Somalia provided internet over satellite, as well as premium routes for media operators and content providers, and international voice gateway services for global carriers. It also offered inexpensive bandwidth through its internet backbone, whereas bandwidth ordinarily cost customers from $2,500 to $3,000 per month through the major international bandwidth providers. The main clients of these local satellite services were internet cafes, money transfer firms and other companies, as well as international community representatives. In total, there were over 300 local satellite terminals available aross the nation, which were linked to teleports in Europe and Asia. Demand for the satellite services gradually began to fall as broadband wireless access rose. However, it increased in rural areas, as the main client base for the satellite services extended their operations into more remote locales.

paragraph_text: Compass-M1 is an experimental satellite launched for signal testing and validation and for the frequency filing on 14 April 2007. The role of Compass-M1 for Compass is similar to the role of the GIOVE satellites for the Galileo system. The orbit of Compass-M1 is nearly circular, has an altitude of 21,150 km and an inclination of 55.5 degrees.

paragraph_text: BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each.

paragraph_text: In April 2007, the first satellite of BeiDou-2, namely Compass-M1 (to validate frequencies for the BeiDou-2 constellation) was successfully put into its working orbit. The second BeiDou-2 constellation satellite Compass-G2 was launched on 15 April 2009. On 15 January 2010, the official website of the BeiDou Navigation Satellite System went online, and the system's third satellite (Compass-G1) was carried into its orbit by a Long March 3C rocket on 17 January 2010. On 2 June 2010, the fourth satellite was launched successfully into orbit. The fifth orbiter was launched into space from Xichang Satellite Launch Center by an LM-3I carrier rocket on 1 August 2010. Three months later, on 1 November 2010, the sixth satellite was sent into orbit by LM-3C. Another satellite, the Beidou-2/Compass IGSO-5 (fifth inclined geosynchonous orbit) satellite, was launched from the Xichang Satellite Launch Center by a Long March-3A on 1 December 2011 (UTC).

paragraph_text: SICRAL 1B is a military communications satellite built by Thales Alenia Space for Italian Armed Forces. It is a dual-use spacecraft: Telespazio will use some of the satellite's transmission capacity and some will be used by the Italian defense ministry and NATO. The spacecraft is based on the Italsat 3000 bus and includes one EHF/Ka band, three UHF-band and five active SHF-band transponders. It is designed to be operable for 13 years.

paragraph_text: Hans K. Ziegler (March 1, 1911, Munich, Germany – December 11, 1999 Colts Neck Township, New Jersey, United States) was a pioneer in the field of communication satellites and the use of photovoltaic solar cells as a power source for satellites.

paragraph_text: NigComSat-1, a Nigerian satellite built in 2004, was Nigeria's third satellite and Africa's first communication satellite. It was launched on 13 May 2007, aboard a Chinese Long March 3B carrier rocket, from the Xichang Satellite Launch Centre in China. The spacecraft was operated by NigComSat and the Nigerian Space Agency, NASRDA. On 11 November 2008, NigComSat-1 failed in orbit after running out of power because of an anomaly in its solar array. It was based on the Chinese DFH-4 satellite bus, and carries a variety of transponders: 4 C-band; 14 Ku-band; 8 Ka-band; and 2 L-band. It was designed to provide coverage to many parts of Africa, and the Ka-band transponders would also cover Italy.

paragraph_text: Tricolor TV is the Russia’s largest satellite TV, and most quickly growing satellite TV in the world. As for beginning of August 2010, over 6.5 millions of families were among its subscribers, i.e. around 80% from the total number of Russian digital TV users. Tricolor TV subscribers are connected and served based on CMW developed by General Satellite. General Satellite Corporation is developer and producer of set-top boxes for this project as well.

paragraph_text: The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003.

paragraph_text: FedSat (Australia's 'Federation Satellite') is an Australian scientific research satellite launched from Tanegashima Space Center, Japan by a NASDA H-IIA launch vehicle in December 2002 (NASDA is now merged with JAXA). The satellite was developed by the Cooperative Research Centre for Satellite Systems, a cooperative made up of several universities, commercial organisations and government bodies. The ground station is at the Institute for Telecommunications Research, part of the University of South Australia, near Adelaide. Since 2005 it was operated by the Australian Department of Defence.

paragraph_text: Hughes attempted to create a joint venture with NBC, News Corp., and Cablevision in 1990, to launch the first high-power digital television service called Sky Cable. Failing to do so, the company instead created DirecTV as a separate division and secured an agreement with USSB to build and launch the first high-power direct-broadcast satellite system. DirecTV's name is a portmanteau of "direct" and "TV" (as in direct broadcast satellite television). Hughes/DirecTV then turned to Thomson Consumer Electronics (under the RCA, GE, and ProScan brands) to develop the digital satellite system for the service that would be capable of receiving 175 channels on a small 18-inch dish. These dishes utilized a new generation of smaller, lighter receiver dishes based on military technology introduced by the Global Broadcast System, which predated DirecTV's viability by almost ten years. Hughes was awarded the contract to build and launch the new high-powered satellites, and USSB and DirecTV agreed that the new satellites would carry the two separate programming services: USSB and DirecTV.

paragraph_text: Arianespace was contracted to launch INSAT - 4B using an Ariane 5 ECA carrier rocket. The launch occurred on 11 March 2007 at 22: 03 UTC, from ELA - 3 at Kourou. The Skynet 5A military communications satellite for the British Ministry of Defence was launched aboard the same rocket.

paragraph_text: Because of this shift in meaning, the term moon, which had continued to be used in a generic sense in works of popular science and in fiction, has regained respectability and is now used interchangeably with natural satellite, even in scientific articles. When it is necessary to avoid both the ambiguity of confusion with Earth's natural satellite the Moon and the natural satellites of the other planets on the one hand, and artificial satellites on the other, the term natural satellite (using ``natural ''in a sense opposed to`` artificial'') is used. To further avoid ambiguity, the convention is to capitalize the word Moon when referring to Earth's natural satellite, but not when referring to other natural satellites.

Question: What is the experimental satellite being forerunner to communication satellite of INSAT-4CR's manufacturer called?
Answer: ATS - 6 (Applications Technology Satellite - 6)