Should the POTS wires be unhooked?
NO. It would be best to avoid even touching the POTS side of the installation, because the span power is probably turned on - that is how the HDSL4 card gets its operating power. It can shock you, especially when it is wet!
Please re-read whynot's last post, the one right above your last post.
Jim
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Speaking from a secure undisclosed location.