Nov 25 08:53:37 firewall pppd[7359]: No response to 3 echo-requests Nov 25 08:53:37 firewall pppd[7359]: Serial link appears to be disconnected.
Troy could try this one as parameter for pppd:
man pppd
lcp-echo-failure n If this option is given, pppd will presume the peer to be dead if n LCP echo-requests are sent without receiving a valid LCP echo-reply. If this happens, pppd will terminate the connection. Use of this option requires a non-zero value for the lcp-echo-interval parameter. This option can be used to enable pppd to terminate after the physical connection has been broken (e.g., the modem has hungup) in situations where no hardware modem control lines are available.
lcp-echo-interval n If this option is given, pppd will send an LCP echo-request frame to the peer every n seconds. Normally the peer should respond to the echo-request by sending an echo-reply. This option can be used with the lcp-echo-failure option to detect that the peer is no longer connected.
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