364662a6_Manager__CallManager_____Cisco_Table_52_Network_Interface_Counter_Descriptions
[Counters] Rx Errors [Counter Descriptions] 
This counter represents the number of inbound packets (packet-oriented interfaces) and the number of inbound transmission units (character-oriented or fixed-length interfaces) that contained errors that prevented them from being deliverable to a higher layer protocol.
Cisco Unified Communications Manager Managed Services Guide, Release 9.1(1) - Cisco Unified Real-Time Monitoring Tool Tracing PerfMon counters and alerts [Cisco Unified Communications Manager (CallManager)] - Cisco