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From: Frankston@MIT-MULTICS.ARPA
Newsgroups: mod.telecom
Subject: Re: what is an AML and how does it work?
Message-ID: <851025032350.613033@MIT-MULTICS.ARPA>
Date: Thu, 24-Oct-85 23:23:00 EDT
Article-I.D.: MIT-MULT.851025032350.613033
Posted: Thu Oct 24 23:23:00 1985
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As I've noted in a previous note, the AML has a serious side effect of
reducing the voltage on the second line to 16 volts thereby causing
equipment that depends on voltage to fail.  In particular hold buttons
that attempt to detect another phone off hook by detecting the voltage
change.

I had my AML removed and replaced by separate pairs.