Hi There. Well, I guess you're looking for a metric of the bytes-per-second speed *capacity* that was negotiated whereas Prognosis has metrics for how *utilised* are the connections such as detailed in Help here: Prognosis for Infrastructure > Prognosis for HP NonStop > Performance Manager > CLIM (Cluster I/O Module) Monitoring > Monitoring CLIM Data > CLIM Central Display.
If they're CLIM fibre channel ports being negotiated, then the PortWorldWideName field in the NonStopPhysicalVolume record may also be worth a try to at least tell you when the port changes. Not sure if yours are IP or Storage CLIMs.
HTH. Let us know.