Description: An index that uniquely identifies an entry in the historyControl table. Each such entry defines a set of samples at a particular interval for an interface on the device.

historyControlIndex of huawei optix devices can be described as following, historyControlIndex consists of SLOT_ID,PORT_ID,SUB_PORT_ID and PERIOD_TYPE. historyControlIndex = SUB_PORT_ID<<31 + SLOT_ID<<24 + PERIOD_TYPE<<16 + PORT_ID; 1) 31bit(1bit) SUB_PORT_ID 1bit: 0 - SUB_PORT_1(east), 1 - SUB_PORT_2(west) for sonet,this para is 0 ,no other means; 2) 24bit~30bit(7bits) SLOT_ID: slot id; 3) 16bit~23(8bits) PERIOD_TYPE: period type; 0x1 - 30s(30 seconds) 0x2 - 30m(30 minutes) 0x3 - prdvar(var period) 4) 0bit~15bit(16bits) PORT_ID: mac port id;

For example: 1: historyControlIndex.83951617 (gauge) 83951617 83951617 = 0x05010001 can be translated as Slot-5,PrdType-30s,Port-1; 2: historyControlIndex.84017153 (gauge) 84017153 84017153 = 0x05020001 can be translated as Slot-5,PrdType-30m,Port-1; 3: historyControlIndex.84082696 (gauge) 84082696 84082696 = 0x05030008 can be translated as Slot-5,PrdType-prdvar,Port-8;