ARJ

ARJ (Archived by Robert Jung) is a software tool designed by Robert K. Jung for creating high-efficiency compressed file archives. ARJ is currently on version 2.86 for DOS and 3.20 for Windows and supports 16-bit, 32-bit and 64-bit Intel architectures.

ARJ was one of two mainstream archivers for DOS and Windows during the early and mid-90s, with PKZIP being its competition. Parts of ARJ were covered by U.S. Patent 5,140,321. Generally ARJ was less popular than PKZIP, but it did enjoy a niche market during the BBS era and in the warez scene. This was largely due to ARJ's creation and handling of multi-volume archives (archives which are split into smaller files which are then suitable for dial-up transfers and floppy distribution) being more robust than PKZIP's.

File format support in other software

ARJ compressed files with the Filename extension .arj can be unpacked with various tools other than the ARJ software. There exists a free software re-implement of the tool. The software 7-Zip and Zipeg can also unpack .arj files. For Mac there exists a standalone utility UnArjMac.

Comac ARJ21

The Comac ARJ21 Xiangfeng (Chinese: 翔凤; pinyin: xiángfèng; literally: "Flying Phoenix") is a twin-engined regional jet, manufactured by Comac.

Development

The development of the ARJ21 (Advanced Regional Jet) is a key project in the "10th Five-Year Plan" of China. It began in March 2002 and was led by the state-owned ACAC consortium. The maiden flight of the ARJ21 was initially planned to take place in 2005 with commercial service beginning 18 months afterwards. The programme was to become 8 years behind schedule. The design work was delayed and the final trial production stage did not begin until June 2006. The first prototype (serial number 101) rolled out on 21 December 2007, with plans for a maiden flight in March 2008. This was first delayed to 21 September 2008 and finally took place on 28 November 2008 at Shanghai's Dachang Airfield. The aircraft completed a long distance test flight on 15 July 2009, flying from Shanghai to Xi'an in 2 hours 19 minutes, over a distance of 1,300 km. The second ARJ21 (serial number 102) completed the same test flight route on 24 August 2009. The third aircraft (serial number 103) similarly completed its first test flight on 12 September 2009. The fourth aircraft (CN 104) flew by November 2010. By August 2011, static, flutter and crosswind flight tests had been completed. Deliveries to customers were expected to begin in late 2010, starting with Chengdu Airlines.

ARJ45

In computer networking hardware, ARJ45 (Augmented Registered Jack 45) is an electronic connector for very high speed applications, such as Class F_A installations as defined by the standard ISO/IEC 11801 and 10, 40 and 100 Gigabit Ethernet transmission copper cabling.

ARJ45 complies with the international standard IEC 61076-3-110.

The connector operates in the frequency spectrum between 600 MHz to 5 GHz with shielded twisted pair and twinax cables. ARJ45 utilizes an internal system of Faraday cages to reduce cross talk to 35 dB or better at 5 GHz. Its performance up to 1000 MHz corresponds to category 7A connecting hardware.

Variants include ARJ45 HS, an 8-contact connector, and ARJ45 HD, a 12-contact connector, equivalent to the GG45 with a switch in the jack that activates the alternative pin locations when a Cat7a plug is inserted.

See also

References

External links