This is wiki version_1.2.3 of the DSL Modem/Router Guide.
Much of the information in this Guide has been distilled from the contributions and suggestions made by the myriad users of the Whirlpool DSL Hardware Forum, including OliphanT who was the original contributor. Thanks to all!
ADSL Modems - Introduction
ADSL Modems - What does DSL mean?
What is ADSL/ADSL2/ADSL2+ ?
ADSL stands for Asymmetric Digital Subscriber Line service. It is called asymmetric because the download and upload speeds are not symmetrical (download is faster than upload).
ADSL2+ (ITU G.992.5) doubles the bandwidth used for downstream data transmission, effectively doubling the maximum downstream data rates, and achieving rates of 20 Mbps on telephone lines as long at 5,000 feet. ADSL2+ solutions will interoperate with ADSL and ADSL2, as well as with ADSL2+. ADSL2+ will include all the feature and performance benefits of ADSL2 while maintaining the capability to interoperate with legacy ADSL equipment.
ADSL Modems - Why ADSL?
1.4 Can I get ADSL?
First you have to have a Telstra telephone service. An Optus telephone service is not compatible as it is not directly connected to the PSTN copper lines.
You must then determine whether your local telephone exchange is ADSL enabled. To check this, click here and type in your telephone number.
You can also find State-based maps of ADSL exchange coverage here. Info from Apple69Mel .
If your local telephone exchange is ADSL enabled, you next have to determine whether it currently has any spare ports available for your connection. To determine this, check this PDF file. If there are currently no spare ports, then you
can find out when an upgrade is scheduled by checking this PDF file .
If your exchange is not ADSL-enabled, you can check this MS Excel file for details of proposed new ADSL exchanges. Info from Apple69Mel
Even if your local telephone exchange is ADSL enabled and has spare capacity, you may still not be able to get ADSL due to a number technical limitations. These include:
• incompatible connection to the PSTN (eg RIM – Remote Integrated Multiplexor, pair gain system, loading coils, bridge taps, analogue NT1, OnRamp – ISDN, satellite services, ported number, a PABX connection called Siteline);
• incompatible services on adjacent pairs (eg HDSL/ISDN);
• incompatible services (eg PABXs, commanders, OnRamp/ISDN, priority assistance, fax stream duet, auxiliary number, call diversion, messagebank virtual, EasyCall multiple number, ported number, Centrex, Spectrum Services, Indial Services customer loop metering, Homezip, InContact);
•limits on the length of the copper wires which connect your telephone service to your local telephone exchange (if you are more than 5Km from your exchange it is very unlikely that you can get ADSL).
If your request for ADSL is rejected due to incompatible services, you may be able to cancel the incompatible service(s) and successfully re-submit your ADSL request.
- Switching ADSL ISP?
If you are switching ADSL ISPs, then check this Telstra page to find out if you can switch using the new "churn" process which eliminates days of downtime and is also cheaper to boot :) The Excel spreadsheet of ISPs participating in the churn process may be found here .
- Hang on! Do I need a device to make ADSL work?