tmnxLocUsrDbDhcpCIdMaskPreNum 1.3.6.1.4.1.6527.3.1.2.51.1.2.1.18

The value of the object tmnxLocUsrDbDhcpCIdMaskPreNum specifies the number of characters to remove from the start of the incoming circuitId before it is matched against the value configured in tmnxLocUsrDbDhcpCircuitId.