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In mid 2007 AJC contracted for an Upgrade of the initially installed AJC capacity of 40G+40G by 80G+80G to total 120G+120G (equivalent to 240G unprotected). This Upgrade required some additional equipment in each of the AJC cable stations but no change to the wet segment comprising the submarine cable and repeaters. The Upgrade was partially completed in December 2007, with final upgrade acceptance as scheduled on 14 April 2008. The Upgrade has a five year warranty.

As part of the analysis for the Upgrade, the supplier advised that technical improvements, including new FEC (Forward Error Correction), provide increased design capacity to a minimum of 1320 Gbit/s between Australia and Guam and 1000 Gbit/s between Guam and Japan. The different design capacity is due to different repeaters south of Guam compared to north of Guam

The Upgrade provided not only continuity of AJC’s existing SDH products of Protected and Unprotected capacity but supports higher speed interfaces and introduced GbE & 10GbE Ethernet plus 10G Direct Wavelength Access capacity.

While the wavelengths installed during the Upgrade are very reliable the Upgrade also includes wavelength protection. Wavelength protection provides for automatic switching of traffic on a wavelength to a spare wavelength in the event of failure. This automatic wavelength protection operates at a similar speed to the Protected SDH automatic switching and is measured in tens of milliseconds.

Upgrade Project 2012

AJC completed an Upgrade using 40G technology in mid 2012. This upgrade included multi-rate 10G client interfaces supporting 10G DWA (9.953G), 10GWANPHY (9.952G), 10GLANPHY (10.3G) and OTU2 (10.7G).

Upgrade Project 2013 and 2014

AJC completed an Upgrade using 100G technology in late 2013 on one side of AJC, and early 2014 on the remaining spans of AJC. During this 100G Upgrade the initial 10G technology on AJC was retired to enable the released spectrum to be used for more bandwidth efficient wavelengths and provide an increased design capacity of 5,000G to 6,000G Australia-Guam-Japan.

Upgrade Project 2018

AJC completed a major Upgrade using latest digital coherent technology in September 2018. This upgrade included multi-rate 10G and 100G client interfaces and increase AJC’s Design Capacity to some 10,000G Australia-Guam-Japan