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Annex B is the current standard for digital subscriber line (DSL) in Germany. A DSL-splitter is an analog L-C-filter to separate the POTS (plain old telephone service, like voice and ISDN, FAX) signals from the DSL signal.
Is the DSL-splitter required, if no devices but a DSL-Modem is connected to the line?
If yes, one could test if a splitter is faulty by connecting the Modem direct to the line. The bandwidth should be similar in both situations.
No splitter or filter needed. – cde – 2014-11-29T00:10:59.950
The answers are in contradiction. Can you please provide sources? – Jonas Stein – 2014-11-29T14:32:54.007
Is the situation different, if the line provides Annex A instead of Annex B? – Jonas Stein – 2014-11-29T14:33:19.803
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From https://community.linksys.com/t5/Cable-and-DSL/What-is-Annex-B-amp-Annex-A-on-the-WAG54G/td-p/23371 "Annex A is ADSL used in most of North America and Europe where the telephone line carries voice and ADSL. As far as I know Annex B is only used in Germany where they have have voice, ISDN and ADSL on the same line."
– DavidPostill – 2014-11-29T16:29:27.117