With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
tn3270sLuCurOutQsize
tn3270s Lu Cur Out Qsize
1.3.6.1.4.1.9.9.54.1.5.1.1.10
The number of TCP packets in the server queued for transmission to the client
Back to CISCO-TN3270SERVER-MIB MIB page.
IPHost Network monitor allows you to monitor tn3270sLuCurOutQsize on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.