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4th 2008f January 2008
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  ADSL at the telphone exchange end

Date:November 9, 2007
Time:7:00 pm.
Place:WEA, 223 Angas Street, ADELAIDE
Presenter:Tony Cormier

Tony Cormier's talk on the installation of telephone exchange-end ADSL equipment, principally DSLAMs, and his Middle-East experiences were well presented together with plenty of photos and samples.The most obvious thing about installing ADSL in the telecommunications' network, as Tony soon made us realize, is that it is very wiring intensive compared to anything before. The equipment itself is ever diminishing as the electronics gets smaller and more compact, so the effect is that we have buildings full of wiring and cables while at the same time the equipment occupies a lot less floor space - although the greater demand for power and the need for more air-conditioning does offset the reduction in floor space somewhat.

Presently the ADSL equipment is installed by removing the single jumper that connects the conventional switched voice call equipment from the cable side to the equipment side on the main frame and replacing it with two jumpers - one from cable to ADSL (the "c" jumper), and one jumper from ADSL to telephone equipment (the "x" jumper). On the other side of the ADSL equipment the internet data streams enter the Internet "cloud" via optical fibre.

In future, when the need for conventional voice calls disappears as expected within approximately the next 10 years, the "x" jumper will simply be removed along with the telephone equipment connected to it and we will have an "all IP" network.

The ADSL equipment is mostly located within existing telephone exchange buildings whether it belongs to Telstra or some other ISP. However, as customers continue to demand higher speeds there is a need to get closer to them over their copper wire so you will start to notice more and more roadside cabinets installations external to telephone exchanges.

Many thanks, Tony, for sharing your ADSL installation and your middle-East experiences with us. We now have a much better insight into the exchange-end of the ADSL network.