This object determines a 2-byte hex value for the Ethertype or
DSAP/SSAP that will be used in conjunction with
a3ComQosNonFlowClassProtoDescriptor.
If a3ComQosNonFlowClassProtoDescriptor is set to name(1) then
this object is not used and it CANNOT be set.
If a3ComQosNonFlowClassProtoDescriptor is set to ethertype(2) then
the value will be used as an ethertype mask.
If a3ComQosNonFlowClassProtoDescriptor is set to dsap-ssap(3) then
the most significant byte will be used for the DSAP value and the
least significant will be used for the SSAP value.
-- Example 1: a3ComQosNonFlowClassProto is set to ethertype (2)
a3ComQosNonFlowClassCustomTypeMask is set to 0x1234
The value 0x1234 will be used in the ethertype field.
-- Example 2: a3ComQosNonFlowClassCustomType is set to dsap-ssap (2)
a3ComQosNonFlowClassCustomTypeMask is set to 0x1234
The value 0x12 would be used for the DSAP value.
The value 0x34 would be used for the SSAP value.