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Page updated Tuesday
26th 2007f June 2007
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  Next GTM network

Date:June 8, 2007
Time:7:00 pm.
Place:WEA, 223 Angas Street, ADELAIDE
Presenter:Colin Huckel

At our June meeting Colin Huckel presented a demonstration of Telstra's Next GTM network with two LG TU-500 handsets including video calling and Internet browsing.

In November 2005 Telstra announced plans to build Australia's largest national third generation mobile broadband network, called the Next GTM network (technically known as '3GSM 850 MHz'). 850 Mhz was chosen over the usual 3G 2100 Mhz as it can cover much greater distances. The network today reaches 98.8% of the Australian population, covering more than 1.9 million square kilometres, with further enhancements during 2007.

Telstra is promoting the multimedia and internet features that come with the new network including internet content, video calls, music and movie downloads, email, photo messaging, television (16 Foxtel channels) and videoconferencing, as well as phone calls and voicemail.

The Next GTM network operates in the 850 MHz frequency and uses High Speed Downlink Packet Access (HSDPA) to provide faster download speeds.

It uses radio channels 5 MHz wide with Rx freq in the range 825 - 845 Mhz and Tx freq 870 - 890 MHz and power levels are adjusted dynamically.

More than one user occupies the same frequency but the use of CODING to differentiate between users and reuses most of the CDMA infrastructure..

It is highly resilient to RF propagation fading and interference due to its spread spectrum technology.

The nation-wide wireless broadband network was built in record time in 10 months, and was turned on all at once across the whole country on 6/10/2006. This included the design, construction and upgrade of around 5000 mobile towers.

Using High Speed Downlink Packet Access (HSDPA) the Next GTM network has increased peak network downlink speed from 3.6 Mbps to 14.4 Mbps, and using High Speed Access (HSUPA) an improved peak network uplink speed from 384 kbps to 1.9 Mbps. A typical customer using existing devices can expect 550 kbps to 1.5 Mbps, bursting to 3 Mbps.

Further enhancements in 2007 include extended range capability - normally the cell range provided by the Next GTM network and CDMA networks is limited to a signalling distance of 50 to 60 kms to a maximum of 80 kms as 30 to 50 metre high towers cannot project their signals much further than 50 kms due to the curvature of the earth. With extended range software, Telstra has extended the range of more than 40 base stations by up to 120 kms - to a maximum of 200 kms.

The Next GTM network's longest recorded terrestrial call was made from a Floating Production Storage and Offloading vessel situated some 154 kms off the coast of Western Australia on 24th April 2007.

Telstra's CDMA Wireless Local Loop (WLL) service, using the CDMA network to provide telephone services to remote customers in some locations, is also being replaced with Next GTM Wireless Link, and existing users are being offered phone and mobile broadband internet through a unit installed in their homes.

The CDMA network closes in Jan/Feb 2008.

Please view _http://www.telstra.com.au/nextg/index.htm_ for more information.