The On / Adsl Test ↔ Off / Line Test Switch - VIERLING VIT-A2 Bedienungsanleitung

VIERLING
3.2 The On / ADSL Test ↔ Off / Line Test switch
This flip switch is used to turn the power supply on and off. The power is
either supplied internally via rechargeable cells or externally via the DC
jack. At the same time, a switch is also made between checking for a
successful ADSL connection setup (switch position "ADSL Test") and
testing for the presence of the remote power supply (switch position "Line
Test").
If both the power test and the ADSL test are passed, then provision of the
ADSL service to the customer has been successfully completed.
Switch position Off / Line Test:
In the switch position "Line Test", the tester detects whether the remote
power supply for an analog or ISDN line is present on the line under test.
The result is indicated by the "Line Test" LED on the top side of the
housing.
If the test result is positive, you can rest assured that both wires (a and b)
are properly connected for ADSL service. This helps to catch cases in
which there is an unintentional one-wire connection but the ADSL modem
somehow still manages to synchronize since the line conditions are
otherwise very good (e.g. low line attenuation).
Note that the power test cannot be performed behind the splitter on the
user side in the direction of the customer modem since there is no longer
any DC voltage present at this point on the line. There is also no way to
determine whether the a/b wires are properly connected in this case.
Switch position On / ADSL Test:
In the switch position "ADSL Test", the tester checks whether it is possible
to synchronize with the DSL access multiplexer (DSLAM) in the exchange.
First, initialization (handshake) takes place in compliance with ITU
Recommendation G.994.1. Then, depending on what is specified by the
DSLAM, a connection is set up using the following supported standards:
•
ITU G.992.1 (ADSL)
•
ITU G.992.3 (ADSL2)
•
ITU G.992.5 (ADSL2+)
28 70299.207 – 1.3 – 20070802 – VIT-A2