450M and pcap

Is there a built-in mechanism to do a packet capture off either the copper or air interfaces on a 450M?

No, although there is a request to add a pcap feature to pmp450 in the ideas section

pcap

best regards

Andy.

Typically, when customers want to see what's going through the link, Wireshark is used on a device connected via our equipment... 

Having an integrated packet capture and/or analysis tool would be cool and useful, but we need to balance the use of space, processing power and cost of internal resources in the radio against the features that are included.

Sometimes it makes more sense to have these tools outside the radio itself.