With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dspuPuOperWindowSize
Cisco DSPU Pu Operation Window Size
1.3.6.1.4.1.9.9.24.1.4.2.1.9
Send/Receive window size to be used across the link between this dspuNode and the remote PU.
Back to CISCO-DSPU-MIB MIB page.
IPHost Network monitor allows you to monitor dspuPuOperWindowSize on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.