Here's an update: I rewired the phone line as in the last diagram, with the DSL modem first and a DSL filter before the alarm. This has eliminated the problem with hissing when the phone is taken off-hook.
I did use one of the 2Wire micro-filters that came with the DSL modem. Probably not...
I have installed ADSL (Verizon DSL with Westell 2200 modem) at our church. I used the standard basic installation technique: DSL filters on the phones, and the modem in one of the phone taps without a filter.
The DSL service seems to be fine-- I haven't checked the throughput but from browsing...
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