With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
serialTimeout
serial Timeout
1.3.6.1.2.1.16.19.10.1.3
This timeout value is used when the Management Station has initiated the conversation over the serial link. This variable represents the number of seconds of inactivity allowed before terminating the connection on this serial interface. Use the serialDialoutTimeout in the case where the probe has initiated the connection for the purpose of sending a trap.
Back to RMON2-MIB MIB page.
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