RJ11 cable maximum length 30 metres?

  Flopper 10:35 06 Mar 2014
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I am in the process of moving our office around and I tried running a 30 metre telephone/ADSL cable from a BT wall socket to a multi-function copier/scanner/printer but when I attempt to send a text fax to the this device expecting it to print it doesn't. Since then I read on a forum that the maximum useful length of a RJ11 cable is 30 metres. Is this true?

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