This value is the second forward traffic descriptor parameter (typically the sustainable cell rate, when the traffic descriptor type includes an SCR component) associated with this failed call, per the description. Along with Param1 and Param3, this fills out the full forward bandwidth profile the call requested, so together they let an admin reconstruct exactly what traffic contract this specific failed SVC was trying to negotiate. Comparing these three parameters across multiple failed calls on this port can reveal whether failures cluster around a particular bandwidth profile that this trunk's provisioning can't support.