antronix millenuim SE series taps are able to do that with plugins (check out page 5) these are what I use.... you can get your forward and reverse levels almost exeacly the same at every tap.
we also developed a standard of installation for modems the tech must have 3.5 to 7 db of loss due to splitters ..modem on a dedicated line....no more no less ......It has worked well for us
http://www.antronix.net/uploads/specs/DS-1031-TM-A01_MGT2000-S_2_0.pdf
Re: 4,8,11 value taps with Reverse window
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