OID 22.214.171.124.2.1.197 (ntpSnmpMIB) within MIB2 contains a number of leafs that your systems may support if queried by UnDPs. Check in there to see if anything will provide the information you need.
As for the "Server to SNMP Server Connection," I assume you are referring to the Orion server's connection to the time server. I use UnDPs to poll my time servers for stratum and clock source. My UnDPs use the proprietary MIB for the time servers. You will need to search for the MIB provided by your time server vendor.